HF radar polar patch formation revisited: summer and winter variations in dayside plasma structuring

Three intervals of polar patch formation, as observed by the CUTLASS Finland HF coherent radar, are presented. Simultaneous observations from a vertical ionosonde located at Longyearbyen on Svalbard, situated in the dayside convection throat region, allow for F-region plasma structuring, leading to...
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Autor*in:	S. E. Milan [verfasserIn] M. Lester [verfasserIn] T. K. Yeoman [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2002

Übergeordnetes Werk:	In: Annales Geophysicae - Copernicus Publications, 2002, 20(2002), Seite 487-499
Übergeordnetes Werk:	volume:20 ; year:2002 ; pages:487-499

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

DOI / URN:	10.5194/angeo-20-487-2002

Katalog-ID:	DOAJ027933466

Internformat


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520			\|a Three intervals of polar patch formation, as observed by the CUTLASS Finland HF coherent radar, are presented. Simultaneous observations from a vertical ionosonde located at Longyearbyen on Svalbard, situated in the dayside convection throat region, allow for F-region plasma structuring, leading to polar cap patch formation to be determined. Solar wind and interplanetary magnetic field (IMF) precursors of polar patch formation are investigated with MFI and SWE measurements from the Wind spacecraft. We find that in the cases studied polar cap patches are formed in response to changes in the orientation of the IMF, especially in the <i<By</i< component. The resultant changes in the dayside convection pattern alter the source of plasma drifting through the convection throat region into the polar cap. When the convection flow is directed predominantly polewards, high density sub-auroral or mid-latitude plasma enters the polar cap; when flow is directed zonally, low density plasma entrained in the convection return flow replaces it. This mechanism can act to significantly structure the plasma density at sub-auroral or mid-latitudes as well as in the polar cap. In winter months, polar patches appear to be produced by depletions in an otherwise high plasma density tongue of ionisation. In summer months, patches are enhancements of an otherwise low density tongue of ionisation.<br<<br<<b<Key words. </b<Ionosphere (ionospheric irregularities; plasma convection; polar ionosphere)
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allfieldsGer	10.5194/angeo-20-487-2002 doi (DE-627)DOAJ027933466 (DE-599)DOAJ82cbb448bd34492197ba6e24f707fa73 DE-627 ger DE-627 rakwb eng QC1-999 QC801-809 S. E. Milan verfasserin aut HF radar polar patch formation revisited: summer and winter variations in dayside plasma structuring 2002 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Three intervals of polar patch formation, as observed by the CUTLASS Finland HF coherent radar, are presented. Simultaneous observations from a vertical ionosonde located at Longyearbyen on Svalbard, situated in the dayside convection throat region, allow for F-region plasma structuring, leading to polar cap patch formation to be determined. Solar wind and interplanetary magnetic field (IMF) precursors of polar patch formation are investigated with MFI and SWE measurements from the Wind spacecraft. We find that in the cases studied polar cap patches are formed in response to changes in the orientation of the IMF, especially in the <i<By</i< component. The resultant changes in the dayside convection pattern alter the source of plasma drifting through the convection throat region into the polar cap. When the convection flow is directed predominantly polewards, high density sub-auroral or mid-latitude plasma enters the polar cap; when flow is directed zonally, low density plasma entrained in the convection return flow replaces it. This mechanism can act to significantly structure the plasma density at sub-auroral or mid-latitudes as well as in the polar cap. In winter months, polar patches appear to be produced by depletions in an otherwise high plasma density tongue of ionisation. In summer months, patches are enhancements of an otherwise low density tongue of ionisation.<br<<br<<b<Key words. </b<Ionosphere (ionospheric irregularities; plasma convection; polar ionosphere) Science Q Physics Geophysics. Cosmic physics S. E. Milan verfasserin aut M. Lester verfasserin aut T. K. Yeoman verfasserin aut In Annales Geophysicae Copernicus Publications, 2002 20(2002), Seite 487-499 (DE-627)25338981X (DE-600)1458425-6 14320576 nnns volume:20 year:2002 pages:487-499 https://doi.org/10.5194/angeo-20-487-2002 kostenfrei https://doaj.org/article/82cbb448bd34492197ba6e24f707fa73 kostenfrei https://www.ann-geophys.net/20/487/2002/angeo-20-487-2002.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 SSG-OLC-PHA 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 20 2002 487-499
allfieldsSound	10.5194/angeo-20-487-2002 doi (DE-627)DOAJ027933466 (DE-599)DOAJ82cbb448bd34492197ba6e24f707fa73 DE-627 ger DE-627 rakwb eng QC1-999 QC801-809 S. E. Milan verfasserin aut HF radar polar patch formation revisited: summer and winter variations in dayside plasma structuring 2002 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Three intervals of polar patch formation, as observed by the CUTLASS Finland HF coherent radar, are presented. Simultaneous observations from a vertical ionosonde located at Longyearbyen on Svalbard, situated in the dayside convection throat region, allow for F-region plasma structuring, leading to polar cap patch formation to be determined. Solar wind and interplanetary magnetic field (IMF) precursors of polar patch formation are investigated with MFI and SWE measurements from the Wind spacecraft. We find that in the cases studied polar cap patches are formed in response to changes in the orientation of the IMF, especially in the <i<By</i< component. The resultant changes in the dayside convection pattern alter the source of plasma drifting through the convection throat region into the polar cap. When the convection flow is directed predominantly polewards, high density sub-auroral or mid-latitude plasma enters the polar cap; when flow is directed zonally, low density plasma entrained in the convection return flow replaces it. This mechanism can act to significantly structure the plasma density at sub-auroral or mid-latitudes as well as in the polar cap. In winter months, polar patches appear to be produced by depletions in an otherwise high plasma density tongue of ionisation. In summer months, patches are enhancements of an otherwise low density tongue of ionisation.<br<<br<<b<Key words. </b<Ionosphere (ionospheric irregularities; plasma convection; polar ionosphere) Science Q Physics Geophysics. Cosmic physics S. E. Milan verfasserin aut M. Lester verfasserin aut T. K. Yeoman verfasserin aut In Annales Geophysicae Copernicus Publications, 2002 20(2002), Seite 487-499 (DE-627)25338981X (DE-600)1458425-6 14320576 nnns volume:20 year:2002 pages:487-499 https://doi.org/10.5194/angeo-20-487-2002 kostenfrei https://doaj.org/article/82cbb448bd34492197ba6e24f707fa73 kostenfrei https://www.ann-geophys.net/20/487/2002/angeo-20-487-2002.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 SSG-OLC-PHA 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 20 2002 487-499
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callnumber-first	Q - Science
author	S. E. Milan
spellingShingle	S. E. Milan misc QC1-999 misc QC801-809 misc Science misc Q misc Physics misc Geophysics. Cosmic physics HF radar polar patch formation revisited: summer and winter variations in dayside plasma structuring
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topic_title	QC1-999 QC801-809 HF radar polar patch formation revisited: summer and winter variations in dayside plasma structuring
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title	HF radar polar patch formation revisited: summer and winter variations in dayside plasma structuring
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title_full	HF radar polar patch formation revisited: summer and winter variations in dayside plasma structuring
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title_sort	hf radar polar patch formation revisited: summer and winter variations in dayside plasma structuring
callnumber	QC1-999
title_auth	HF radar polar patch formation revisited: summer and winter variations in dayside plasma structuring
abstract	Three intervals of polar patch formation, as observed by the CUTLASS Finland HF coherent radar, are presented. Simultaneous observations from a vertical ionosonde located at Longyearbyen on Svalbard, situated in the dayside convection throat region, allow for F-region plasma structuring, leading to polar cap patch formation to be determined. Solar wind and interplanetary magnetic field (IMF) precursors of polar patch formation are investigated with MFI and SWE measurements from the Wind spacecraft. We find that in the cases studied polar cap patches are formed in response to changes in the orientation of the IMF, especially in the <i<By</i< component. The resultant changes in the dayside convection pattern alter the source of plasma drifting through the convection throat region into the polar cap. When the convection flow is directed predominantly polewards, high density sub-auroral or mid-latitude plasma enters the polar cap; when flow is directed zonally, low density plasma entrained in the convection return flow replaces it. This mechanism can act to significantly structure the plasma density at sub-auroral or mid-latitudes as well as in the polar cap. In winter months, polar patches appear to be produced by depletions in an otherwise high plasma density tongue of ionisation. In summer months, patches are enhancements of an otherwise low density tongue of ionisation.<br<<br<<b<Key words. </b<Ionosphere (ionospheric irregularities; plasma convection; polar ionosphere)
abstractGer	Three intervals of polar patch formation, as observed by the CUTLASS Finland HF coherent radar, are presented. Simultaneous observations from a vertical ionosonde located at Longyearbyen on Svalbard, situated in the dayside convection throat region, allow for F-region plasma structuring, leading to polar cap patch formation to be determined. Solar wind and interplanetary magnetic field (IMF) precursors of polar patch formation are investigated with MFI and SWE measurements from the Wind spacecraft. We find that in the cases studied polar cap patches are formed in response to changes in the orientation of the IMF, especially in the <i<By</i< component. The resultant changes in the dayside convection pattern alter the source of plasma drifting through the convection throat region into the polar cap. When the convection flow is directed predominantly polewards, high density sub-auroral or mid-latitude plasma enters the polar cap; when flow is directed zonally, low density plasma entrained in the convection return flow replaces it. This mechanism can act to significantly structure the plasma density at sub-auroral or mid-latitudes as well as in the polar cap. In winter months, polar patches appear to be produced by depletions in an otherwise high plasma density tongue of ionisation. In summer months, patches are enhancements of an otherwise low density tongue of ionisation.<br<<br<<b<Key words. </b<Ionosphere (ionospheric irregularities; plasma convection; polar ionosphere)
abstract_unstemmed	Three intervals of polar patch formation, as observed by the CUTLASS Finland HF coherent radar, are presented. Simultaneous observations from a vertical ionosonde located at Longyearbyen on Svalbard, situated in the dayside convection throat region, allow for F-region plasma structuring, leading to polar cap patch formation to be determined. Solar wind and interplanetary magnetic field (IMF) precursors of polar patch formation are investigated with MFI and SWE measurements from the Wind spacecraft. We find that in the cases studied polar cap patches are formed in response to changes in the orientation of the IMF, especially in the <i<By</i< component. The resultant changes in the dayside convection pattern alter the source of plasma drifting through the convection throat region into the polar cap. When the convection flow is directed predominantly polewards, high density sub-auroral or mid-latitude plasma enters the polar cap; when flow is directed zonally, low density plasma entrained in the convection return flow replaces it. This mechanism can act to significantly structure the plasma density at sub-auroral or mid-latitudes as well as in the polar cap. In winter months, polar patches appear to be produced by depletions in an otherwise high plasma density tongue of ionisation. In summer months, patches are enhancements of an otherwise low density tongue of ionisation.<br<<br<<b<Key words. </b<Ionosphere (ionospheric irregularities; plasma convection; polar ionosphere)
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title_short	HF radar polar patch formation revisited: summer and winter variations in dayside plasma structuring
url	https://doi.org/10.5194/angeo-20-487-2002 https://doaj.org/article/82cbb448bd34492197ba6e24f707fa73 https://www.ann-geophys.net/20/487/2002/angeo-20-487-2002.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576
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up_date	2024-07-03T14:49:55.458Z
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