Interhemispheric asymmetries in the occurrence of magnetically conjugate sub-auroral polarisation streams

Earthward injections of energetic ions and electrons mark the onset of magnetospheric substorms. In the inner magnetosphere (L<IMG WIDTH="15" HEIGHT="15" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img1.gif" ALT="${sim}$"<4), the energetic ions drift westward and the electrons eastward, thereby enhancing the equatorial ring current. Wave-particle interactions can accelerate these particles to radiation belt energies. The ions are injected slightly closer to Earth in the pre-midnight sector, leading to the formation of a radial polarisation field in the inner magnetosphere. This maps to a poleward electric field just equatorward of the auroral oval in the ionosphere. The poleward electric field is subsequently amplified by ionospheric feedback, thereby producing auroral westward flow channels (AWFCs). In terms of electric field strength, AWFCs are the strongest manifestation of substorms in the ionosphere. Because geomagnetic flux tubes are essentially equi-potentials, similar AWFC signatures should be observed simultaneously in the Northern and Southern Hemispheres. Here we present magnetically conjugate SuperDARN radar observations of AWFC activity observed in the pre-midnight sector during two substorm intervals including multiple onsets during the evening of 30 November 2002. The Northern Hemisphere observations were made with the Japanese radar located at King Salmon, Alaska (57<IMG WIDTH="10" HEIGHT="16" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img2.gif" ALT="$^{circ}$"<<IMG WIDTH="20" HEIGHT="32" ALIGN="MIDDLE" BORDER="0" src="ag-23-1371-img3.gif" ALT="$Lambda )$"<, and the Southern Hemisphere observations with the Tasman International Geospace Environment Radar (TIGER) located at Bruny Island, Tasmania (<IMG WIDTH="15" HEIGHT="29" ALIGN="MIDDLE" BORDER="0" src="ag-23-1371-img4.gif" ALT="$-$"<55<IMG WIDTH="10" HEIGHT="16" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img2.gif" ALT="$^{circ}$"<<IMG WIDTH="20" HEIGHT="32" ALIGN="MIDDLE" BORDER="0" src="ag-23-1371-img3.gif" ALT="$Lambda )$"<. LANL geosynchronous satellite observations of energetic ion and electron fluxes monitored the effects of substorms in the inner magnetosphere (L<IMG WIDTH="15" HEIGHT="15" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img1.gif" ALT="${sim}$"<6). The radar-observed AWFC activity was coincident with activity observed at geosynchronous orbit, as well as westward current surges in the ionosphere observed using ground-based magnetometers. The location of AWFCs with respect to the auroral oval was inferred from FUV auroral images recorded on board the IMAGE spacecraft. DMSP SSIES ion drift measurements confirmed the presence of AWFCs equatorward of the auroral oval. Systematic asymmetries in the interhemispheric signatures of the AWFCs probably arose because the magnetic flux tubes were distorted at L shells passing close to the substorm dipolarisation region. Transient asymmetries were attributed to the development of nearby field-aligned potential drops and currents. Ausführliche Beschreibung

Gespeichert in:

Autor*in:	M. L. Parkinson [verfasserIn] M. Pinnock [verfasserIn] J. A. Wild [verfasserIn] M. Lester [verfasserIn] T. K. Yeoman [verfasserIn] S. E. Milan [verfasserIn] H. Ye [verfasserIn] J. C. Devlin [verfasserIn] H. U. Frey [verfasserIn] T. Kikuchi [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2005

Übergeordnetes Werk:	In: Annales Geophysicae - Copernicus Publications, 2002, 23(2005), Seite 1371-1390
Übergeordnetes Werk:	volume:23 ; year:2005 ; pages:1371-1390

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc Journal toc

DOI / URN:	10.5194/angeo-23-1371-2005

Katalog-ID:	DOAJ002042606

Internformat


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520			\|a Earthward injections of energetic ions and electrons mark the onset of magnetospheric substorms. In the inner magnetosphere (L<IMG WIDTH="15" HEIGHT="15" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img1.gif" ALT="${sim}$"<4), the energetic ions drift westward and the electrons eastward, thereby enhancing the equatorial ring current. Wave-particle interactions can accelerate these particles to radiation belt energies. The ions are injected slightly closer to Earth in the pre-midnight sector, leading to the formation of a radial polarisation field in the inner magnetosphere. This maps to a poleward electric field just equatorward of the auroral oval in the ionosphere. The poleward electric field is subsequently amplified by ionospheric feedback, thereby producing auroral westward flow channels (AWFCs). In terms of electric field strength, AWFCs are the strongest manifestation of substorms in the ionosphere. Because geomagnetic flux tubes are essentially equi-potentials, similar AWFC signatures should be observed simultaneously in the Northern and Southern Hemispheres. Here we present magnetically conjugate SuperDARN radar observations of AWFC activity observed in the pre-midnight sector during two substorm intervals including multiple onsets during the evening of 30 November 2002. The Northern Hemisphere observations were made with the Japanese radar located at King Salmon, Alaska (57<IMG WIDTH="10" HEIGHT="16" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img2.gif" ALT="$^{circ}$"<<IMG WIDTH="20" HEIGHT="32" ALIGN="MIDDLE" BORDER="0" src="ag-23-1371-img3.gif" ALT="$Lambda )$"<, and the Southern Hemisphere observations with the Tasman International Geospace Environment Radar (TIGER) located at Bruny Island, Tasmania (<IMG WIDTH="15" HEIGHT="29" ALIGN="MIDDLE" BORDER="0" src="ag-23-1371-img4.gif" ALT="$-$"<55<IMG WIDTH="10" HEIGHT="16" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img2.gif" ALT="$^{circ}$"<<IMG WIDTH="20" HEIGHT="32" ALIGN="MIDDLE" BORDER="0" src="ag-23-1371-img3.gif" ALT="$Lambda )$"<. LANL geosynchronous satellite observations of energetic ion and electron fluxes monitored the effects of substorms in the inner magnetosphere (L<IMG WIDTH="15" HEIGHT="15" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img1.gif" ALT="${sim}$"<6). The radar-observed AWFC activity was coincident with activity observed at geosynchronous orbit, as well as westward current surges in the ionosphere observed using ground-based magnetometers. The location of AWFCs with respect to the auroral oval was inferred from FUV auroral images recorded on board the IMAGE spacecraft. DMSP SSIES ion drift measurements confirmed the presence of AWFCs equatorward of the auroral oval. Systematic asymmetries in the interhemispheric signatures of the AWFCs probably arose because the magnetic flux tubes were distorted at L shells passing close to the substorm dipolarisation region. Transient asymmetries were attributed to the development of nearby field-aligned potential drops and currents.
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700	0		\|a S. E. Milan \|e verfasserin \|4 aut
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700	0		\|a J. C. Devlin \|e verfasserin \|4 aut
700	0		\|a H. U. Frey \|e verfasserin \|4 aut
700	0		\|a T. Kikuchi \|e verfasserin \|4 aut
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allfields	10.5194/angeo-23-1371-2005 doi (DE-627)DOAJ002042606 (DE-599)DOAJ970d9f3bd08649a983a49e870b12b170 DE-627 ger DE-627 rakwb eng QC1-999 QC801-809 M. L. Parkinson verfasserin aut Interhemispheric asymmetries in the occurrence of magnetically conjugate sub-auroral polarisation streams 2005 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Earthward injections of energetic ions and electrons mark the onset of magnetospheric substorms. In the inner magnetosphere (L<IMG WIDTH="15" HEIGHT="15" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img1.gif" ALT="${sim}$"<4), the energetic ions drift westward and the electrons eastward, thereby enhancing the equatorial ring current. Wave-particle interactions can accelerate these particles to radiation belt energies. The ions are injected slightly closer to Earth in the pre-midnight sector, leading to the formation of a radial polarisation field in the inner magnetosphere. This maps to a poleward electric field just equatorward of the auroral oval in the ionosphere. The poleward electric field is subsequently amplified by ionospheric feedback, thereby producing auroral westward flow channels (AWFCs). In terms of electric field strength, AWFCs are the strongest manifestation of substorms in the ionosphere. Because geomagnetic flux tubes are essentially equi-potentials, similar AWFC signatures should be observed simultaneously in the Northern and Southern Hemispheres. Here we present magnetically conjugate SuperDARN radar observations of AWFC activity observed in the pre-midnight sector during two substorm intervals including multiple onsets during the evening of 30 November 2002. The Northern Hemisphere observations were made with the Japanese radar located at King Salmon, Alaska (57<IMG WIDTH="10" HEIGHT="16" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img2.gif" ALT="$^{circ}$"<<IMG WIDTH="20" HEIGHT="32" ALIGN="MIDDLE" BORDER="0" src="ag-23-1371-img3.gif" ALT="$Lambda )$"<, and the Southern Hemisphere observations with the Tasman International Geospace Environment Radar (TIGER) located at Bruny Island, Tasmania (<IMG WIDTH="15" HEIGHT="29" ALIGN="MIDDLE" BORDER="0" src="ag-23-1371-img4.gif" ALT="$-$"<55<IMG WIDTH="10" HEIGHT="16" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img2.gif" ALT="$^{circ}$"<<IMG WIDTH="20" HEIGHT="32" ALIGN="MIDDLE" BORDER="0" src="ag-23-1371-img3.gif" ALT="$Lambda )$"<. LANL geosynchronous satellite observations of energetic ion and electron fluxes monitored the effects of substorms in the inner magnetosphere (L<IMG WIDTH="15" HEIGHT="15" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img1.gif" ALT="${sim}$"<6). The radar-observed AWFC activity was coincident with activity observed at geosynchronous orbit, as well as westward current surges in the ionosphere observed using ground-based magnetometers. The location of AWFCs with respect to the auroral oval was inferred from FUV auroral images recorded on board the IMAGE spacecraft. DMSP SSIES ion drift measurements confirmed the presence of AWFCs equatorward of the auroral oval. Systematic asymmetries in the interhemispheric signatures of the AWFCs probably arose because the magnetic flux tubes were distorted at L shells passing close to the substorm dipolarisation region. Transient asymmetries were attributed to the development of nearby field-aligned potential drops and currents. Science Q Physics Geophysics. Cosmic physics M. Pinnock verfasserin aut J. A. Wild verfasserin aut M. Lester verfasserin aut T. K. Yeoman verfasserin aut S. E. Milan verfasserin aut H. Ye verfasserin aut J. C. Devlin verfasserin aut H. U. Frey verfasserin aut T. Kikuchi verfasserin aut In Annales Geophysicae Copernicus Publications, 2002 23(2005), Seite 1371-1390 (DE-627)25338981X (DE-600)1458425-6 14320576 nnns volume:23 year:2005 pages:1371-1390 https://doi.org/10.5194/angeo-23-1371-2005 kostenfrei https://doaj.org/article/970d9f3bd08649a983a49e870b12b170 kostenfrei https://www.ann-geophys.net/23/1371/2005/angeo-23-1371-2005.pdf kostenfrei https://doaj.org/toc/0992-7689 Journal toc kostenfrei https://doaj.org/toc/1432-0576 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_267 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_381 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2014 GBV_ILN_2048 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 23 2005 1371-1390
spelling	10.5194/angeo-23-1371-2005 doi (DE-627)DOAJ002042606 (DE-599)DOAJ970d9f3bd08649a983a49e870b12b170 DE-627 ger DE-627 rakwb eng QC1-999 QC801-809 M. L. Parkinson verfasserin aut Interhemispheric asymmetries in the occurrence of magnetically conjugate sub-auroral polarisation streams 2005 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Earthward injections of energetic ions and electrons mark the onset of magnetospheric substorms. In the inner magnetosphere (L<IMG WIDTH="15" HEIGHT="15" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img1.gif" ALT="${sim}$"<4), the energetic ions drift westward and the electrons eastward, thereby enhancing the equatorial ring current. Wave-particle interactions can accelerate these particles to radiation belt energies. The ions are injected slightly closer to Earth in the pre-midnight sector, leading to the formation of a radial polarisation field in the inner magnetosphere. This maps to a poleward electric field just equatorward of the auroral oval in the ionosphere. The poleward electric field is subsequently amplified by ionospheric feedback, thereby producing auroral westward flow channels (AWFCs). In terms of electric field strength, AWFCs are the strongest manifestation of substorms in the ionosphere. Because geomagnetic flux tubes are essentially equi-potentials, similar AWFC signatures should be observed simultaneously in the Northern and Southern Hemispheres. Here we present magnetically conjugate SuperDARN radar observations of AWFC activity observed in the pre-midnight sector during two substorm intervals including multiple onsets during the evening of 30 November 2002. The Northern Hemisphere observations were made with the Japanese radar located at King Salmon, Alaska (57<IMG WIDTH="10" HEIGHT="16" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img2.gif" ALT="$^{circ}$"<<IMG WIDTH="20" HEIGHT="32" ALIGN="MIDDLE" BORDER="0" src="ag-23-1371-img3.gif" ALT="$Lambda )$"<, and the Southern Hemisphere observations with the Tasman International Geospace Environment Radar (TIGER) located at Bruny Island, Tasmania (<IMG WIDTH="15" HEIGHT="29" ALIGN="MIDDLE" BORDER="0" src="ag-23-1371-img4.gif" ALT="$-$"<55<IMG WIDTH="10" HEIGHT="16" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img2.gif" ALT="$^{circ}$"<<IMG WIDTH="20" HEIGHT="32" ALIGN="MIDDLE" BORDER="0" src="ag-23-1371-img3.gif" ALT="$Lambda )$"<. LANL geosynchronous satellite observations of energetic ion and electron fluxes monitored the effects of substorms in the inner magnetosphere (L<IMG WIDTH="15" HEIGHT="15" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img1.gif" ALT="${sim}$"<6). The radar-observed AWFC activity was coincident with activity observed at geosynchronous orbit, as well as westward current surges in the ionosphere observed using ground-based magnetometers. The location of AWFCs with respect to the auroral oval was inferred from FUV auroral images recorded on board the IMAGE spacecraft. DMSP SSIES ion drift measurements confirmed the presence of AWFCs equatorward of the auroral oval. Systematic asymmetries in the interhemispheric signatures of the AWFCs probably arose because the magnetic flux tubes were distorted at L shells passing close to the substorm dipolarisation region. Transient asymmetries were attributed to the development of nearby field-aligned potential drops and currents. Science Q Physics Geophysics. Cosmic physics M. Pinnock verfasserin aut J. A. Wild verfasserin aut M. Lester verfasserin aut T. K. Yeoman verfasserin aut S. E. Milan verfasserin aut H. Ye verfasserin aut J. C. Devlin verfasserin aut H. U. Frey verfasserin aut T. Kikuchi verfasserin aut In Annales Geophysicae Copernicus Publications, 2002 23(2005), Seite 1371-1390 (DE-627)25338981X (DE-600)1458425-6 14320576 nnns volume:23 year:2005 pages:1371-1390 https://doi.org/10.5194/angeo-23-1371-2005 kostenfrei https://doaj.org/article/970d9f3bd08649a983a49e870b12b170 kostenfrei https://www.ann-geophys.net/23/1371/2005/angeo-23-1371-2005.pdf kostenfrei https://doaj.org/toc/0992-7689 Journal toc kostenfrei https://doaj.org/toc/1432-0576 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_267 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_381 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2014 GBV_ILN_2048 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 23 2005 1371-1390
allfields_unstemmed	10.5194/angeo-23-1371-2005 doi (DE-627)DOAJ002042606 (DE-599)DOAJ970d9f3bd08649a983a49e870b12b170 DE-627 ger DE-627 rakwb eng QC1-999 QC801-809 M. L. Parkinson verfasserin aut Interhemispheric asymmetries in the occurrence of magnetically conjugate sub-auroral polarisation streams 2005 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Earthward injections of energetic ions and electrons mark the onset of magnetospheric substorms. In the inner magnetosphere (L<IMG WIDTH="15" HEIGHT="15" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img1.gif" ALT="${sim}$"<4), the energetic ions drift westward and the electrons eastward, thereby enhancing the equatorial ring current. Wave-particle interactions can accelerate these particles to radiation belt energies. The ions are injected slightly closer to Earth in the pre-midnight sector, leading to the formation of a radial polarisation field in the inner magnetosphere. This maps to a poleward electric field just equatorward of the auroral oval in the ionosphere. The poleward electric field is subsequently amplified by ionospheric feedback, thereby producing auroral westward flow channels (AWFCs). In terms of electric field strength, AWFCs are the strongest manifestation of substorms in the ionosphere. Because geomagnetic flux tubes are essentially equi-potentials, similar AWFC signatures should be observed simultaneously in the Northern and Southern Hemispheres. Here we present magnetically conjugate SuperDARN radar observations of AWFC activity observed in the pre-midnight sector during two substorm intervals including multiple onsets during the evening of 30 November 2002. The Northern Hemisphere observations were made with the Japanese radar located at King Salmon, Alaska (57<IMG WIDTH="10" HEIGHT="16" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img2.gif" ALT="$^{circ}$"<<IMG WIDTH="20" HEIGHT="32" ALIGN="MIDDLE" BORDER="0" src="ag-23-1371-img3.gif" ALT="$Lambda )$"<, and the Southern Hemisphere observations with the Tasman International Geospace Environment Radar (TIGER) located at Bruny Island, Tasmania (<IMG WIDTH="15" HEIGHT="29" ALIGN="MIDDLE" BORDER="0" src="ag-23-1371-img4.gif" ALT="$-$"<55<IMG WIDTH="10" HEIGHT="16" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img2.gif" ALT="$^{circ}$"<<IMG WIDTH="20" HEIGHT="32" ALIGN="MIDDLE" BORDER="0" src="ag-23-1371-img3.gif" ALT="$Lambda )$"<. LANL geosynchronous satellite observations of energetic ion and electron fluxes monitored the effects of substorms in the inner magnetosphere (L<IMG WIDTH="15" HEIGHT="15" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img1.gif" ALT="${sim}$"<6). The radar-observed AWFC activity was coincident with activity observed at geosynchronous orbit, as well as westward current surges in the ionosphere observed using ground-based magnetometers. The location of AWFCs with respect to the auroral oval was inferred from FUV auroral images recorded on board the IMAGE spacecraft. DMSP SSIES ion drift measurements confirmed the presence of AWFCs equatorward of the auroral oval. Systematic asymmetries in the interhemispheric signatures of the AWFCs probably arose because the magnetic flux tubes were distorted at L shells passing close to the substorm dipolarisation region. Transient asymmetries were attributed to the development of nearby field-aligned potential drops and currents. Science Q Physics Geophysics. Cosmic physics M. Pinnock verfasserin aut J. A. Wild verfasserin aut M. Lester verfasserin aut T. K. Yeoman verfasserin aut S. E. Milan verfasserin aut H. Ye verfasserin aut J. C. Devlin verfasserin aut H. U. Frey verfasserin aut T. Kikuchi verfasserin aut In Annales Geophysicae Copernicus Publications, 2002 23(2005), Seite 1371-1390 (DE-627)25338981X (DE-600)1458425-6 14320576 nnns volume:23 year:2005 pages:1371-1390 https://doi.org/10.5194/angeo-23-1371-2005 kostenfrei https://doaj.org/article/970d9f3bd08649a983a49e870b12b170 kostenfrei https://www.ann-geophys.net/23/1371/2005/angeo-23-1371-2005.pdf kostenfrei https://doaj.org/toc/0992-7689 Journal toc kostenfrei https://doaj.org/toc/1432-0576 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_267 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_381 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2014 GBV_ILN_2048 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 23 2005 1371-1390
allfieldsGer	10.5194/angeo-23-1371-2005 doi (DE-627)DOAJ002042606 (DE-599)DOAJ970d9f3bd08649a983a49e870b12b170 DE-627 ger DE-627 rakwb eng QC1-999 QC801-809 M. L. Parkinson verfasserin aut Interhemispheric asymmetries in the occurrence of magnetically conjugate sub-auroral polarisation streams 2005 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Earthward injections of energetic ions and electrons mark the onset of magnetospheric substorms. In the inner magnetosphere (L<IMG WIDTH="15" HEIGHT="15" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img1.gif" ALT="${sim}$"<4), the energetic ions drift westward and the electrons eastward, thereby enhancing the equatorial ring current. Wave-particle interactions can accelerate these particles to radiation belt energies. The ions are injected slightly closer to Earth in the pre-midnight sector, leading to the formation of a radial polarisation field in the inner magnetosphere. This maps to a poleward electric field just equatorward of the auroral oval in the ionosphere. The poleward electric field is subsequently amplified by ionospheric feedback, thereby producing auroral westward flow channels (AWFCs). In terms of electric field strength, AWFCs are the strongest manifestation of substorms in the ionosphere. Because geomagnetic flux tubes are essentially equi-potentials, similar AWFC signatures should be observed simultaneously in the Northern and Southern Hemispheres. Here we present magnetically conjugate SuperDARN radar observations of AWFC activity observed in the pre-midnight sector during two substorm intervals including multiple onsets during the evening of 30 November 2002. The Northern Hemisphere observations were made with the Japanese radar located at King Salmon, Alaska (57<IMG WIDTH="10" HEIGHT="16" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img2.gif" ALT="$^{circ}$"<<IMG WIDTH="20" HEIGHT="32" ALIGN="MIDDLE" BORDER="0" src="ag-23-1371-img3.gif" ALT="$Lambda )$"<, and the Southern Hemisphere observations with the Tasman International Geospace Environment Radar (TIGER) located at Bruny Island, Tasmania (<IMG WIDTH="15" HEIGHT="29" ALIGN="MIDDLE" BORDER="0" src="ag-23-1371-img4.gif" ALT="$-$"<55<IMG WIDTH="10" HEIGHT="16" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img2.gif" ALT="$^{circ}$"<<IMG WIDTH="20" HEIGHT="32" ALIGN="MIDDLE" BORDER="0" src="ag-23-1371-img3.gif" ALT="$Lambda )$"<. LANL geosynchronous satellite observations of energetic ion and electron fluxes monitored the effects of substorms in the inner magnetosphere (L<IMG WIDTH="15" HEIGHT="15" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img1.gif" ALT="${sim}$"<6). The radar-observed AWFC activity was coincident with activity observed at geosynchronous orbit, as well as westward current surges in the ionosphere observed using ground-based magnetometers. The location of AWFCs with respect to the auroral oval was inferred from FUV auroral images recorded on board the IMAGE spacecraft. DMSP SSIES ion drift measurements confirmed the presence of AWFCs equatorward of the auroral oval. Systematic asymmetries in the interhemispheric signatures of the AWFCs probably arose because the magnetic flux tubes were distorted at L shells passing close to the substorm dipolarisation region. Transient asymmetries were attributed to the development of nearby field-aligned potential drops and currents. Science Q Physics Geophysics. Cosmic physics M. Pinnock verfasserin aut J. A. Wild verfasserin aut M. Lester verfasserin aut T. K. Yeoman verfasserin aut S. E. Milan verfasserin aut H. Ye verfasserin aut J. C. Devlin verfasserin aut H. U. Frey verfasserin aut T. Kikuchi verfasserin aut In Annales Geophysicae Copernicus Publications, 2002 23(2005), Seite 1371-1390 (DE-627)25338981X (DE-600)1458425-6 14320576 nnns volume:23 year:2005 pages:1371-1390 https://doi.org/10.5194/angeo-23-1371-2005 kostenfrei https://doaj.org/article/970d9f3bd08649a983a49e870b12b170 kostenfrei https://www.ann-geophys.net/23/1371/2005/angeo-23-1371-2005.pdf kostenfrei https://doaj.org/toc/0992-7689 Journal toc kostenfrei https://doaj.org/toc/1432-0576 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_267 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_381 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2014 GBV_ILN_2048 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 23 2005 1371-1390
allfieldsSound	10.5194/angeo-23-1371-2005 doi (DE-627)DOAJ002042606 (DE-599)DOAJ970d9f3bd08649a983a49e870b12b170 DE-627 ger DE-627 rakwb eng QC1-999 QC801-809 M. L. Parkinson verfasserin aut Interhemispheric asymmetries in the occurrence of magnetically conjugate sub-auroral polarisation streams 2005 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Earthward injections of energetic ions and electrons mark the onset of magnetospheric substorms. In the inner magnetosphere (L<IMG WIDTH="15" HEIGHT="15" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img1.gif" ALT="${sim}$"<4), the energetic ions drift westward and the electrons eastward, thereby enhancing the equatorial ring current. Wave-particle interactions can accelerate these particles to radiation belt energies. The ions are injected slightly closer to Earth in the pre-midnight sector, leading to the formation of a radial polarisation field in the inner magnetosphere. This maps to a poleward electric field just equatorward of the auroral oval in the ionosphere. The poleward electric field is subsequently amplified by ionospheric feedback, thereby producing auroral westward flow channels (AWFCs). In terms of electric field strength, AWFCs are the strongest manifestation of substorms in the ionosphere. Because geomagnetic flux tubes are essentially equi-potentials, similar AWFC signatures should be observed simultaneously in the Northern and Southern Hemispheres. Here we present magnetically conjugate SuperDARN radar observations of AWFC activity observed in the pre-midnight sector during two substorm intervals including multiple onsets during the evening of 30 November 2002. The Northern Hemisphere observations were made with the Japanese radar located at King Salmon, Alaska (57<IMG WIDTH="10" HEIGHT="16" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img2.gif" ALT="$^{circ}$"<<IMG WIDTH="20" HEIGHT="32" ALIGN="MIDDLE" BORDER="0" src="ag-23-1371-img3.gif" ALT="$Lambda )$"<, and the Southern Hemisphere observations with the Tasman International Geospace Environment Radar (TIGER) located at Bruny Island, Tasmania (<IMG WIDTH="15" HEIGHT="29" ALIGN="MIDDLE" BORDER="0" src="ag-23-1371-img4.gif" ALT="$-$"<55<IMG WIDTH="10" HEIGHT="16" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img2.gif" ALT="$^{circ}$"<<IMG WIDTH="20" HEIGHT="32" ALIGN="MIDDLE" BORDER="0" src="ag-23-1371-img3.gif" ALT="$Lambda )$"<. LANL geosynchronous satellite observations of energetic ion and electron fluxes monitored the effects of substorms in the inner magnetosphere (L<IMG WIDTH="15" HEIGHT="15" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img1.gif" ALT="${sim}$"<6). The radar-observed AWFC activity was coincident with activity observed at geosynchronous orbit, as well as westward current surges in the ionosphere observed using ground-based magnetometers. The location of AWFCs with respect to the auroral oval was inferred from FUV auroral images recorded on board the IMAGE spacecraft. DMSP SSIES ion drift measurements confirmed the presence of AWFCs equatorward of the auroral oval. Systematic asymmetries in the interhemispheric signatures of the AWFCs probably arose because the magnetic flux tubes were distorted at L shells passing close to the substorm dipolarisation region. Transient asymmetries were attributed to the development of nearby field-aligned potential drops and currents. Science Q Physics Geophysics. Cosmic physics M. Pinnock verfasserin aut J. A. Wild verfasserin aut M. Lester verfasserin aut T. K. Yeoman verfasserin aut S. E. Milan verfasserin aut H. Ye verfasserin aut J. C. Devlin verfasserin aut H. U. Frey verfasserin aut T. Kikuchi verfasserin aut In Annales Geophysicae Copernicus Publications, 2002 23(2005), Seite 1371-1390 (DE-627)25338981X (DE-600)1458425-6 14320576 nnns volume:23 year:2005 pages:1371-1390 https://doi.org/10.5194/angeo-23-1371-2005 kostenfrei https://doaj.org/article/970d9f3bd08649a983a49e870b12b170 kostenfrei https://www.ann-geophys.net/23/1371/2005/angeo-23-1371-2005.pdf kostenfrei https://doaj.org/toc/0992-7689 Journal toc kostenfrei https://doaj.org/toc/1432-0576 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_267 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_381 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2014 GBV_ILN_2048 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 23 2005 1371-1390
language	English
source	In Annales Geophysicae 23(2005), Seite 1371-1390 volume:23 year:2005 pages:1371-1390
sourceStr	In Annales Geophysicae 23(2005), Seite 1371-1390 volume:23 year:2005 pages:1371-1390
format_phy_str_mv	Article
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topic_facet	Science Q Physics Geophysics. Cosmic physics
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authorswithroles_txt_mv	M. L. Parkinson @@aut@@ M. Pinnock @@aut@@ J. A. Wild @@aut@@ M. Lester @@aut@@ T. K. Yeoman @@aut@@ S. E. Milan @@aut@@ H. Ye @@aut@@ J. C. Devlin @@aut@@ H. U. Frey @@aut@@ T. Kikuchi @@aut@@
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Parkinson</subfield><subfield code="e">verfasserin</subfield><subfield code="4">aut</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">Interhemispheric asymmetries in the occurrence of magnetically conjugate sub-auroral polarisation streams</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="c">2005</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="a">Text</subfield><subfield code="b">txt</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="a">Computermedien</subfield><subfield code="b">c</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="a">Online-Ressource</subfield><subfield code="b">cr</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">Earthward injections of energetic ions and electrons mark the onset of magnetospheric substorms. In the inner magnetosphere (L<IMG WIDTH="15" HEIGHT="15" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img1.gif" ALT="${sim}$"<4), the energetic ions drift westward and the electrons eastward, thereby enhancing the equatorial ring current. Wave-particle interactions can accelerate these particles to radiation belt energies. The ions are injected slightly closer to Earth in the pre-midnight sector, leading to the formation of a radial polarisation field in the inner magnetosphere. This maps to a poleward electric field just equatorward of the auroral oval in the ionosphere. The poleward electric field is subsequently amplified by ionospheric feedback, thereby producing auroral westward flow channels (AWFCs). In terms of electric field strength, AWFCs are the strongest manifestation of substorms in the ionosphere. Because geomagnetic flux tubes are essentially equi-potentials, similar AWFC signatures should be observed simultaneously in the Northern and Southern Hemispheres. 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callnumber-first	Q - Science
author	M. L. Parkinson
spellingShingle	M. L. Parkinson misc QC1-999 misc QC801-809 misc Science misc Q misc Physics misc Geophysics. Cosmic physics Interhemispheric asymmetries in the occurrence of magnetically conjugate sub-auroral polarisation streams
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topic_title	QC1-999 QC801-809 Interhemispheric asymmetries in the occurrence of magnetically conjugate sub-auroral polarisation streams
topic	misc QC1-999 misc QC801-809 misc Science misc Q misc Physics misc Geophysics. Cosmic physics
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title	Interhemispheric asymmetries in the occurrence of magnetically conjugate sub-auroral polarisation streams
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title_full	Interhemispheric asymmetries in the occurrence of magnetically conjugate sub-auroral polarisation streams
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author_browse	M. L. Parkinson M. Pinnock J. A. Wild M. Lester T. K. Yeoman S. E. Milan H. Ye J. C. Devlin H. U. Frey T. Kikuchi
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title_sort	interhemispheric asymmetries in the occurrence of magnetically conjugate sub-auroral polarisation streams
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title_auth	Interhemispheric asymmetries in the occurrence of magnetically conjugate sub-auroral polarisation streams
abstract	Earthward injections of energetic ions and electrons mark the onset of magnetospheric substorms. In the inner magnetosphere (L<IMG WIDTH="15" HEIGHT="15" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img1.gif" ALT="${sim}$"<4), the energetic ions drift westward and the electrons eastward, thereby enhancing the equatorial ring current. Wave-particle interactions can accelerate these particles to radiation belt energies. The ions are injected slightly closer to Earth in the pre-midnight sector, leading to the formation of a radial polarisation field in the inner magnetosphere. This maps to a poleward electric field just equatorward of the auroral oval in the ionosphere. The poleward electric field is subsequently amplified by ionospheric feedback, thereby producing auroral westward flow channels (AWFCs). In terms of electric field strength, AWFCs are the strongest manifestation of substorms in the ionosphere. Because geomagnetic flux tubes are essentially equi-potentials, similar AWFC signatures should be observed simultaneously in the Northern and Southern Hemispheres. Here we present magnetically conjugate SuperDARN radar observations of AWFC activity observed in the pre-midnight sector during two substorm intervals including multiple onsets during the evening of 30 November 2002. The Northern Hemisphere observations were made with the Japanese radar located at King Salmon, Alaska (57<IMG WIDTH="10" HEIGHT="16" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img2.gif" ALT="$^{circ}$"<<IMG WIDTH="20" HEIGHT="32" ALIGN="MIDDLE" BORDER="0" src="ag-23-1371-img3.gif" ALT="$Lambda )$"<, and the Southern Hemisphere observations with the Tasman International Geospace Environment Radar (TIGER) located at Bruny Island, Tasmania (<IMG WIDTH="15" HEIGHT="29" ALIGN="MIDDLE" BORDER="0" src="ag-23-1371-img4.gif" ALT="$-$"<55<IMG WIDTH="10" HEIGHT="16" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img2.gif" ALT="$^{circ}$"<<IMG WIDTH="20" HEIGHT="32" ALIGN="MIDDLE" BORDER="0" src="ag-23-1371-img3.gif" ALT="$Lambda )$"<. LANL geosynchronous satellite observations of energetic ion and electron fluxes monitored the effects of substorms in the inner magnetosphere (L<IMG WIDTH="15" HEIGHT="15" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img1.gif" ALT="${sim}$"<6). The radar-observed AWFC activity was coincident with activity observed at geosynchronous orbit, as well as westward current surges in the ionosphere observed using ground-based magnetometers. The location of AWFCs with respect to the auroral oval was inferred from FUV auroral images recorded on board the IMAGE spacecraft. DMSP SSIES ion drift measurements confirmed the presence of AWFCs equatorward of the auroral oval. Systematic asymmetries in the interhemispheric signatures of the AWFCs probably arose because the magnetic flux tubes were distorted at L shells passing close to the substorm dipolarisation region. Transient asymmetries were attributed to the development of nearby field-aligned potential drops and currents.
abstractGer	Earthward injections of energetic ions and electrons mark the onset of magnetospheric substorms. In the inner magnetosphere (L<IMG WIDTH="15" HEIGHT="15" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img1.gif" ALT="${sim}$"<4), the energetic ions drift westward and the electrons eastward, thereby enhancing the equatorial ring current. Wave-particle interactions can accelerate these particles to radiation belt energies. The ions are injected slightly closer to Earth in the pre-midnight sector, leading to the formation of a radial polarisation field in the inner magnetosphere. This maps to a poleward electric field just equatorward of the auroral oval in the ionosphere. The poleward electric field is subsequently amplified by ionospheric feedback, thereby producing auroral westward flow channels (AWFCs). In terms of electric field strength, AWFCs are the strongest manifestation of substorms in the ionosphere. Because geomagnetic flux tubes are essentially equi-potentials, similar AWFC signatures should be observed simultaneously in the Northern and Southern Hemispheres. Here we present magnetically conjugate SuperDARN radar observations of AWFC activity observed in the pre-midnight sector during two substorm intervals including multiple onsets during the evening of 30 November 2002. The Northern Hemisphere observations were made with the Japanese radar located at King Salmon, Alaska (57<IMG WIDTH="10" HEIGHT="16" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img2.gif" ALT="$^{circ}$"<<IMG WIDTH="20" HEIGHT="32" ALIGN="MIDDLE" BORDER="0" src="ag-23-1371-img3.gif" ALT="$Lambda )$"<, and the Southern Hemisphere observations with the Tasman International Geospace Environment Radar (TIGER) located at Bruny Island, Tasmania (<IMG WIDTH="15" HEIGHT="29" ALIGN="MIDDLE" BORDER="0" src="ag-23-1371-img4.gif" ALT="$-$"<55<IMG WIDTH="10" HEIGHT="16" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img2.gif" ALT="$^{circ}$"<<IMG WIDTH="20" HEIGHT="32" ALIGN="MIDDLE" BORDER="0" src="ag-23-1371-img3.gif" ALT="$Lambda )$"<. LANL geosynchronous satellite observations of energetic ion and electron fluxes monitored the effects of substorms in the inner magnetosphere (L<IMG WIDTH="15" HEIGHT="15" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img1.gif" ALT="${sim}$"<6). The radar-observed AWFC activity was coincident with activity observed at geosynchronous orbit, as well as westward current surges in the ionosphere observed using ground-based magnetometers. The location of AWFCs with respect to the auroral oval was inferred from FUV auroral images recorded on board the IMAGE spacecraft. DMSP SSIES ion drift measurements confirmed the presence of AWFCs equatorward of the auroral oval. Systematic asymmetries in the interhemispheric signatures of the AWFCs probably arose because the magnetic flux tubes were distorted at L shells passing close to the substorm dipolarisation region. Transient asymmetries were attributed to the development of nearby field-aligned potential drops and currents.
abstract_unstemmed	Earthward injections of energetic ions and electrons mark the onset of magnetospheric substorms. In the inner magnetosphere (L<IMG WIDTH="15" HEIGHT="15" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img1.gif" ALT="${sim}$"<4), the energetic ions drift westward and the electrons eastward, thereby enhancing the equatorial ring current. Wave-particle interactions can accelerate these particles to radiation belt energies. The ions are injected slightly closer to Earth in the pre-midnight sector, leading to the formation of a radial polarisation field in the inner magnetosphere. This maps to a poleward electric field just equatorward of the auroral oval in the ionosphere. The poleward electric field is subsequently amplified by ionospheric feedback, thereby producing auroral westward flow channels (AWFCs). In terms of electric field strength, AWFCs are the strongest manifestation of substorms in the ionosphere. Because geomagnetic flux tubes are essentially equi-potentials, similar AWFC signatures should be observed simultaneously in the Northern and Southern Hemispheres. Here we present magnetically conjugate SuperDARN radar observations of AWFC activity observed in the pre-midnight sector during two substorm intervals including multiple onsets during the evening of 30 November 2002. The Northern Hemisphere observations were made with the Japanese radar located at King Salmon, Alaska (57<IMG WIDTH="10" HEIGHT="16" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img2.gif" ALT="$^{circ}$"<<IMG WIDTH="20" HEIGHT="32" ALIGN="MIDDLE" BORDER="0" src="ag-23-1371-img3.gif" ALT="$Lambda )$"<, and the Southern Hemisphere observations with the Tasman International Geospace Environment Radar (TIGER) located at Bruny Island, Tasmania (<IMG WIDTH="15" HEIGHT="29" ALIGN="MIDDLE" BORDER="0" src="ag-23-1371-img4.gif" ALT="$-$"<55<IMG WIDTH="10" HEIGHT="16" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img2.gif" ALT="$^{circ}$"<<IMG WIDTH="20" HEIGHT="32" ALIGN="MIDDLE" BORDER="0" src="ag-23-1371-img3.gif" ALT="$Lambda )$"<. LANL geosynchronous satellite observations of energetic ion and electron fluxes monitored the effects of substorms in the inner magnetosphere (L<IMG WIDTH="15" HEIGHT="15" ALIGN="BOTTOM" BORDER="0" src="ag-23-1371-img1.gif" ALT="${sim}$"<6). The radar-observed AWFC activity was coincident with activity observed at geosynchronous orbit, as well as westward current surges in the ionosphere observed using ground-based magnetometers. The location of AWFCs with respect to the auroral oval was inferred from FUV auroral images recorded on board the IMAGE spacecraft. DMSP SSIES ion drift measurements confirmed the presence of AWFCs equatorward of the auroral oval. Systematic asymmetries in the interhemispheric signatures of the AWFCs probably arose because the magnetic flux tubes were distorted at L shells passing close to the substorm dipolarisation region. Transient asymmetries were attributed to the development of nearby field-aligned potential drops and currents.
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title_short	Interhemispheric asymmetries in the occurrence of magnetically conjugate sub-auroral polarisation streams
url	https://doi.org/10.5194/angeo-23-1371-2005 https://doaj.org/article/970d9f3bd08649a983a49e870b12b170 https://www.ann-geophys.net/23/1371/2005/angeo-23-1371-2005.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576
remote_bool	true
author2	M. Pinnock J. A. Wild M. Lester T. K. Yeoman S. E. Milan H. Ye J. C. Devlin H. U. Frey T. Kikuchi
author2Str	M. Pinnock J. A. Wild M. Lester T. K. Yeoman S. E. Milan H. Ye J. C. Devlin H. U. Frey T. Kikuchi
ppnlink	25338981X
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doi_str	10.5194/angeo-23-1371-2005
callnumber-a	QC1-999
up_date	2024-07-03T23:38:43.344Z
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Interhemispheric asymmetries in the occurrence of magnetically conjugate sub-auroral polarisation streams

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