SABRE observations of structured ionospheric flows during substorm expansion phase onset

The irregularity velocity patterns observed by the SABRE coherent radar at substorm expansion phase onset, which is identified by magnetometer observations of Pi2 pulsations, are occasionally highly structured. In all the examples of structured velocity patterns examined, the SABRE viewing area is l...
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Autor*in:	M. Lester [verfasserIn] E. G. Bradshaw [verfasserIn] T. B. Jones [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	0000

Übergeordnetes Werk:	In: Annales Geophysicae - Copernicus Publications, 2002, 12(0000), 10/11, Seite 1027-1038
Übergeordnetes Werk:	volume:12 ; year:0000 ; number:10/11 ; pages:1027-1038

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Katalog-ID:	DOAJ022115846

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520			\|a The irregularity velocity patterns observed by the SABRE coherent radar at substorm expansion phase onset, which is identified by magnetometer observations of Pi2 pulsations, are occasionally highly structured. In all the examples of structured velocity patterns examined, the SABRE viewing area is located at longitudes within the inferred substorm current wedge. Three types of structured velocity regime are apparent depending on the level of magnetic activity and the position of the radar viewing area relative to the substorm enhanced currents and the Pi2 pulsation generation region. Firstly, vortex-like velocity patterns are observed and these may be caused by the field-aligned currents associated with the substorm current wedge. Secondly, regions of equatorward velocity are also observed at times of substorm expansion phase onset moving longitudinally across the SABRE viewing area. The longitudinal movement is usually westward although an example of eastward motion has been observed. The phase velocity of these regions of equatorward flow is typically 1-3 km s<sup>-1</sup>. The observed equatorward velocities occur at the poleward edge or poleward of the background convection velocities observed by SABRE. These equatorward velocities may be related to the westward travelling surge and to the expansion (eastwards as well as westwards) of the brightening arc region at substorm onset. Thirdly, the flow rotates equatorward within the field of view but does not then appear to move longitudinally. These equatorward velocities may relate to the earthward surge of plasma from the magnetotail at substorm onset.
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allfields	(DE-627)DOAJ022115846 (DE-599)DOAJbffeec722f8b428292f24118f156dc36 DE-627 ger DE-627 rakwb eng QC1-999 QC801-809 M. Lester verfasserin aut SABRE observations of structured ionospheric flows during substorm expansion phase onset 0000 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The irregularity velocity patterns observed by the SABRE coherent radar at substorm expansion phase onset, which is identified by magnetometer observations of Pi2 pulsations, are occasionally highly structured. In all the examples of structured velocity patterns examined, the SABRE viewing area is located at longitudes within the inferred substorm current wedge. Three types of structured velocity regime are apparent depending on the level of magnetic activity and the position of the radar viewing area relative to the substorm enhanced currents and the Pi2 pulsation generation region. Firstly, vortex-like velocity patterns are observed and these may be caused by the field-aligned currents associated with the substorm current wedge. Secondly, regions of equatorward velocity are also observed at times of substorm expansion phase onset moving longitudinally across the SABRE viewing area. The longitudinal movement is usually westward although an example of eastward motion has been observed. The phase velocity of these regions of equatorward flow is typically 1-3 km s<sup>-1</sup>. The observed equatorward velocities occur at the poleward edge or poleward of the background convection velocities observed by SABRE. These equatorward velocities may be related to the westward travelling surge and to the expansion (eastwards as well as westwards) of the brightening arc region at substorm onset. Thirdly, the flow rotates equatorward within the field of view but does not then appear to move longitudinally. These equatorward velocities may relate to the earthward surge of plasma from the magnetotail at substorm onset. Science Q Physics Geophysics. Cosmic physics E. G. Bradshaw verfasserin aut T. B. Jones verfasserin aut In Annales Geophysicae Copernicus Publications, 2002 12(0000), 10/11, Seite 1027-1038 (DE-627)25338981X (DE-600)1458425-6 14320576 nnns volume:12 year:0000 number:10/11 pages:1027-1038 https://doaj.org/article/bffeec722f8b428292f24118f156dc36 kostenfrei http://www.ann-geophys.net/12/1027/1994/angeo-12-1027-1994.html 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_22 GBV_ILN_206 GBV_ILN_267 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4305 AR 12 0000 10/11 1027-1038
spelling	(DE-627)DOAJ022115846 (DE-599)DOAJbffeec722f8b428292f24118f156dc36 DE-627 ger DE-627 rakwb eng QC1-999 QC801-809 M. Lester verfasserin aut SABRE observations of structured ionospheric flows during substorm expansion phase onset 0000 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The irregularity velocity patterns observed by the SABRE coherent radar at substorm expansion phase onset, which is identified by magnetometer observations of Pi2 pulsations, are occasionally highly structured. In all the examples of structured velocity patterns examined, the SABRE viewing area is located at longitudes within the inferred substorm current wedge. Three types of structured velocity regime are apparent depending on the level of magnetic activity and the position of the radar viewing area relative to the substorm enhanced currents and the Pi2 pulsation generation region. Firstly, vortex-like velocity patterns are observed and these may be caused by the field-aligned currents associated with the substorm current wedge. Secondly, regions of equatorward velocity are also observed at times of substorm expansion phase onset moving longitudinally across the SABRE viewing area. The longitudinal movement is usually westward although an example of eastward motion has been observed. The phase velocity of these regions of equatorward flow is typically 1-3 km s<sup>-1</sup>. The observed equatorward velocities occur at the poleward edge or poleward of the background convection velocities observed by SABRE. These equatorward velocities may be related to the westward travelling surge and to the expansion (eastwards as well as westwards) of the brightening arc region at substorm onset. Thirdly, the flow rotates equatorward within the field of view but does not then appear to move longitudinally. These equatorward velocities may relate to the earthward surge of plasma from the magnetotail at substorm onset. Science Q Physics Geophysics. Cosmic physics E. G. Bradshaw verfasserin aut T. B. Jones verfasserin aut In Annales Geophysicae Copernicus Publications, 2002 12(0000), 10/11, Seite 1027-1038 (DE-627)25338981X (DE-600)1458425-6 14320576 nnns volume:12 year:0000 number:10/11 pages:1027-1038 https://doaj.org/article/bffeec722f8b428292f24118f156dc36 kostenfrei http://www.ann-geophys.net/12/1027/1994/angeo-12-1027-1994.html 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_22 GBV_ILN_206 GBV_ILN_267 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4305 AR 12 0000 10/11 1027-1038
allfields_unstemmed	(DE-627)DOAJ022115846 (DE-599)DOAJbffeec722f8b428292f24118f156dc36 DE-627 ger DE-627 rakwb eng QC1-999 QC801-809 M. Lester verfasserin aut SABRE observations of structured ionospheric flows during substorm expansion phase onset 0000 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The irregularity velocity patterns observed by the SABRE coherent radar at substorm expansion phase onset, which is identified by magnetometer observations of Pi2 pulsations, are occasionally highly structured. In all the examples of structured velocity patterns examined, the SABRE viewing area is located at longitudes within the inferred substorm current wedge. Three types of structured velocity regime are apparent depending on the level of magnetic activity and the position of the radar viewing area relative to the substorm enhanced currents and the Pi2 pulsation generation region. Firstly, vortex-like velocity patterns are observed and these may be caused by the field-aligned currents associated with the substorm current wedge. Secondly, regions of equatorward velocity are also observed at times of substorm expansion phase onset moving longitudinally across the SABRE viewing area. The longitudinal movement is usually westward although an example of eastward motion has been observed. The phase velocity of these regions of equatorward flow is typically 1-3 km s<sup>-1</sup>. The observed equatorward velocities occur at the poleward edge or poleward of the background convection velocities observed by SABRE. These equatorward velocities may be related to the westward travelling surge and to the expansion (eastwards as well as westwards) of the brightening arc region at substorm onset. Thirdly, the flow rotates equatorward within the field of view but does not then appear to move longitudinally. These equatorward velocities may relate to the earthward surge of plasma from the magnetotail at substorm onset. Science Q Physics Geophysics. Cosmic physics E. G. Bradshaw verfasserin aut T. B. Jones verfasserin aut In Annales Geophysicae Copernicus Publications, 2002 12(0000), 10/11, Seite 1027-1038 (DE-627)25338981X (DE-600)1458425-6 14320576 nnns volume:12 year:0000 number:10/11 pages:1027-1038 https://doaj.org/article/bffeec722f8b428292f24118f156dc36 kostenfrei http://www.ann-geophys.net/12/1027/1994/angeo-12-1027-1994.html 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_22 GBV_ILN_206 GBV_ILN_267 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4305 AR 12 0000 10/11 1027-1038
allfieldsGer	(DE-627)DOAJ022115846 (DE-599)DOAJbffeec722f8b428292f24118f156dc36 DE-627 ger DE-627 rakwb eng QC1-999 QC801-809 M. Lester verfasserin aut SABRE observations of structured ionospheric flows during substorm expansion phase onset 0000 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The irregularity velocity patterns observed by the SABRE coherent radar at substorm expansion phase onset, which is identified by magnetometer observations of Pi2 pulsations, are occasionally highly structured. In all the examples of structured velocity patterns examined, the SABRE viewing area is located at longitudes within the inferred substorm current wedge. Three types of structured velocity regime are apparent depending on the level of magnetic activity and the position of the radar viewing area relative to the substorm enhanced currents and the Pi2 pulsation generation region. Firstly, vortex-like velocity patterns are observed and these may be caused by the field-aligned currents associated with the substorm current wedge. Secondly, regions of equatorward velocity are also observed at times of substorm expansion phase onset moving longitudinally across the SABRE viewing area. The longitudinal movement is usually westward although an example of eastward motion has been observed. The phase velocity of these regions of equatorward flow is typically 1-3 km s<sup>-1</sup>. The observed equatorward velocities occur at the poleward edge or poleward of the background convection velocities observed by SABRE. These equatorward velocities may be related to the westward travelling surge and to the expansion (eastwards as well as westwards) of the brightening arc region at substorm onset. Thirdly, the flow rotates equatorward within the field of view but does not then appear to move longitudinally. These equatorward velocities may relate to the earthward surge of plasma from the magnetotail at substorm onset. Science Q Physics Geophysics. Cosmic physics E. G. Bradshaw verfasserin aut T. B. Jones verfasserin aut In Annales Geophysicae Copernicus Publications, 2002 12(0000), 10/11, Seite 1027-1038 (DE-627)25338981X (DE-600)1458425-6 14320576 nnns volume:12 year:0000 number:10/11 pages:1027-1038 https://doaj.org/article/bffeec722f8b428292f24118f156dc36 kostenfrei http://www.ann-geophys.net/12/1027/1994/angeo-12-1027-1994.html 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_22 GBV_ILN_206 GBV_ILN_267 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4305 AR 12 0000 10/11 1027-1038
allfieldsSound	(DE-627)DOAJ022115846 (DE-599)DOAJbffeec722f8b428292f24118f156dc36 DE-627 ger DE-627 rakwb eng QC1-999 QC801-809 M. Lester verfasserin aut SABRE observations of structured ionospheric flows during substorm expansion phase onset 0000 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The irregularity velocity patterns observed by the SABRE coherent radar at substorm expansion phase onset, which is identified by magnetometer observations of Pi2 pulsations, are occasionally highly structured. In all the examples of structured velocity patterns examined, the SABRE viewing area is located at longitudes within the inferred substorm current wedge. Three types of structured velocity regime are apparent depending on the level of magnetic activity and the position of the radar viewing area relative to the substorm enhanced currents and the Pi2 pulsation generation region. Firstly, vortex-like velocity patterns are observed and these may be caused by the field-aligned currents associated with the substorm current wedge. Secondly, regions of equatorward velocity are also observed at times of substorm expansion phase onset moving longitudinally across the SABRE viewing area. The longitudinal movement is usually westward although an example of eastward motion has been observed. The phase velocity of these regions of equatorward flow is typically 1-3 km s<sup>-1</sup>. The observed equatorward velocities occur at the poleward edge or poleward of the background convection velocities observed by SABRE. These equatorward velocities may be related to the westward travelling surge and to the expansion (eastwards as well as westwards) of the brightening arc region at substorm onset. Thirdly, the flow rotates equatorward within the field of view but does not then appear to move longitudinally. These equatorward velocities may relate to the earthward surge of plasma from the magnetotail at substorm onset. Science Q Physics Geophysics. Cosmic physics E. G. Bradshaw verfasserin aut T. B. Jones verfasserin aut In Annales Geophysicae Copernicus Publications, 2002 12(0000), 10/11, Seite 1027-1038 (DE-627)25338981X (DE-600)1458425-6 14320576 nnns volume:12 year:0000 number:10/11 pages:1027-1038 https://doaj.org/article/bffeec722f8b428292f24118f156dc36 kostenfrei http://www.ann-geophys.net/12/1027/1994/angeo-12-1027-1994.html 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_22 GBV_ILN_206 GBV_ILN_267 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4305 AR 12 0000 10/11 1027-1038
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format_facet	Elektronische Aufsätze Aufsätze Elektronische Ressource
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title	SABRE observations of structured ionospheric flows during substorm expansion phase onset
ctrlnum	(DE-627)DOAJ022115846 (DE-599)DOAJbffeec722f8b428292f24118f156dc36
title_full	SABRE observations of structured ionospheric flows during substorm expansion phase onset
author_sort	M. Lester
journal	Annales Geophysicae
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author_browse	M. Lester E. G. Bradshaw T. B. Jones
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author-letter	M. Lester
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title_sort	sabre observations of structured ionospheric flows during substorm expansion phase onset
callnumber	QC1-999
title_auth	SABRE observations of structured ionospheric flows during substorm expansion phase onset
abstract	The irregularity velocity patterns observed by the SABRE coherent radar at substorm expansion phase onset, which is identified by magnetometer observations of Pi2 pulsations, are occasionally highly structured. In all the examples of structured velocity patterns examined, the SABRE viewing area is located at longitudes within the inferred substorm current wedge. Three types of structured velocity regime are apparent depending on the level of magnetic activity and the position of the radar viewing area relative to the substorm enhanced currents and the Pi2 pulsation generation region. Firstly, vortex-like velocity patterns are observed and these may be caused by the field-aligned currents associated with the substorm current wedge. Secondly, regions of equatorward velocity are also observed at times of substorm expansion phase onset moving longitudinally across the SABRE viewing area. The longitudinal movement is usually westward although an example of eastward motion has been observed. The phase velocity of these regions of equatorward flow is typically 1-3 km s<sup>-1</sup>. The observed equatorward velocities occur at the poleward edge or poleward of the background convection velocities observed by SABRE. These equatorward velocities may be related to the westward travelling surge and to the expansion (eastwards as well as westwards) of the brightening arc region at substorm onset. Thirdly, the flow rotates equatorward within the field of view but does not then appear to move longitudinally. These equatorward velocities may relate to the earthward surge of plasma from the magnetotail at substorm onset.
abstractGer	The irregularity velocity patterns observed by the SABRE coherent radar at substorm expansion phase onset, which is identified by magnetometer observations of Pi2 pulsations, are occasionally highly structured. In all the examples of structured velocity patterns examined, the SABRE viewing area is located at longitudes within the inferred substorm current wedge. Three types of structured velocity regime are apparent depending on the level of magnetic activity and the position of the radar viewing area relative to the substorm enhanced currents and the Pi2 pulsation generation region. Firstly, vortex-like velocity patterns are observed and these may be caused by the field-aligned currents associated with the substorm current wedge. Secondly, regions of equatorward velocity are also observed at times of substorm expansion phase onset moving longitudinally across the SABRE viewing area. The longitudinal movement is usually westward although an example of eastward motion has been observed. The phase velocity of these regions of equatorward flow is typically 1-3 km s<sup>-1</sup>. The observed equatorward velocities occur at the poleward edge or poleward of the background convection velocities observed by SABRE. These equatorward velocities may be related to the westward travelling surge and to the expansion (eastwards as well as westwards) of the brightening arc region at substorm onset. Thirdly, the flow rotates equatorward within the field of view but does not then appear to move longitudinally. These equatorward velocities may relate to the earthward surge of plasma from the magnetotail at substorm onset.
abstract_unstemmed	The irregularity velocity patterns observed by the SABRE coherent radar at substorm expansion phase onset, which is identified by magnetometer observations of Pi2 pulsations, are occasionally highly structured. In all the examples of structured velocity patterns examined, the SABRE viewing area is located at longitudes within the inferred substorm current wedge. Three types of structured velocity regime are apparent depending on the level of magnetic activity and the position of the radar viewing area relative to the substorm enhanced currents and the Pi2 pulsation generation region. Firstly, vortex-like velocity patterns are observed and these may be caused by the field-aligned currents associated with the substorm current wedge. Secondly, regions of equatorward velocity are also observed at times of substorm expansion phase onset moving longitudinally across the SABRE viewing area. The longitudinal movement is usually westward although an example of eastward motion has been observed. The phase velocity of these regions of equatorward flow is typically 1-3 km s<sup>-1</sup>. The observed equatorward velocities occur at the poleward edge or poleward of the background convection velocities observed by SABRE. These equatorward velocities may be related to the westward travelling surge and to the expansion (eastwards as well as westwards) of the brightening arc region at substorm onset. Thirdly, the flow rotates equatorward within the field of view but does not then appear to move longitudinally. These equatorward velocities may relate to the earthward surge of plasma from the magnetotail at substorm onset.
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container_issue	10/11
title_short	SABRE observations of structured ionospheric flows during substorm expansion phase onset
url	https://doaj.org/article/bffeec722f8b428292f24118f156dc36 http://www.ann-geophys.net/12/1027/1994/angeo-12-1027-1994.html https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576
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up_date	2024-07-04T00:15:55.844Z
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