EISCAT Svalbard radar observations of ionospheric signatures of magnetopause reconnection during a changing IMF Bz polarity
Observations by the EISCAT Svalbard radar are presented that show the response of the spatial structure of the ionosphere in the dayside cusp region to a rotational trend in the IMF clock angle. Over a period of one hour, the clock angle increased from about 45° to some 150°, moving the likely locat...
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ftdoajarticles:oai:doaj.org/article:3877e6bb2bc34fd0bb101031643c1dc0 2023-05-15T16:04:32+02:00 EISCAT Svalbard radar observations of ionospheric signatures of magnetopause reconnection during a changing IMF Bz polarity S. E. Pryse A. M. Smith L. Kersley I. W. McCrea 2002-04-01T00:00:00Z https://doi.org/10.5194/angeo-20-477-2002 https://doaj.org/article/3877e6bb2bc34fd0bb101031643c1dc0 EN eng Copernicus Publications https://www.ann-geophys.net/20/477/2002/angeo-20-477-2002.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-20-477-2002 0992-7689 1432-0576 https://doaj.org/article/3877e6bb2bc34fd0bb101031643c1dc0 Annales Geophysicae, Vol 20, Pp 477-486 (2002) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2002 ftdoajarticles https://doi.org/10.5194/angeo-20-477-2002 2022-12-30T23:09:25Z Observations by the EISCAT Svalbard radar are presented that show the response of the spatial structure of the ionosphere in the dayside cusp region to a rotational trend in the IMF clock angle. Over a period of one hour, the clock angle increased from about 45° to some 150°, moving the likely location of the magnetopause reconnection site from the high-latitude lobe to near the equatorial plane. Increased topside electron temperatures measured by the ESR identified footprints of the reconnection process. Temporal changes in the spatial distribution of the temperature reflected the change from lobe to equatorial reconnection. Discrete spatial enhancements in ion temperature were found resulting from ion-neutral frictional heating in the fast flows where it was likely that field lines were being convected from the reconnection locations. The corresponding electron density structuring is interpreted in terms of the particle precipitation, field-aligned currents and convection flows driven by the IMF. Key words. Ionosphere (ionosphere – magnetosphere interactions; plasma temperature and density; polar ionosphere) Article in Journal/Newspaper EISCAT Svalbard Directory of Open Access Journals: DOAJ Articles Svalbard Annales Geophysicae 20 4 477 486 |
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Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 S. E. Pryse A. M. Smith L. Kersley I. W. McCrea EISCAT Svalbard radar observations of ionospheric signatures of magnetopause reconnection during a changing IMF Bz polarity |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
Observations by the EISCAT Svalbard radar are presented that show the response of the spatial structure of the ionosphere in the dayside cusp region to a rotational trend in the IMF clock angle. Over a period of one hour, the clock angle increased from about 45° to some 150°, moving the likely location of the magnetopause reconnection site from the high-latitude lobe to near the equatorial plane. Increased topside electron temperatures measured by the ESR identified footprints of the reconnection process. Temporal changes in the spatial distribution of the temperature reflected the change from lobe to equatorial reconnection. Discrete spatial enhancements in ion temperature were found resulting from ion-neutral frictional heating in the fast flows where it was likely that field lines were being convected from the reconnection locations. The corresponding electron density structuring is interpreted in terms of the particle precipitation, field-aligned currents and convection flows driven by the IMF. Key words. Ionosphere (ionosphere – magnetosphere interactions; plasma temperature and density; polar ionosphere) |
format |
Article in Journal/Newspaper |
author |
S. E. Pryse A. M. Smith L. Kersley I. W. McCrea |
author_facet |
S. E. Pryse A. M. Smith L. Kersley I. W. McCrea |
author_sort |
S. E. Pryse |
title |
EISCAT Svalbard radar observations of ionospheric signatures of magnetopause reconnection during a changing IMF Bz polarity |
title_short |
EISCAT Svalbard radar observations of ionospheric signatures of magnetopause reconnection during a changing IMF Bz polarity |
title_full |
EISCAT Svalbard radar observations of ionospheric signatures of magnetopause reconnection during a changing IMF Bz polarity |
title_fullStr |
EISCAT Svalbard radar observations of ionospheric signatures of magnetopause reconnection during a changing IMF Bz polarity |
title_full_unstemmed |
EISCAT Svalbard radar observations of ionospheric signatures of magnetopause reconnection during a changing IMF Bz polarity |
title_sort |
eiscat svalbard radar observations of ionospheric signatures of magnetopause reconnection during a changing imf bz polarity |
publisher |
Copernicus Publications |
publishDate |
2002 |
url |
https://doi.org/10.5194/angeo-20-477-2002 https://doaj.org/article/3877e6bb2bc34fd0bb101031643c1dc0 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
EISCAT Svalbard |
genre_facet |
EISCAT Svalbard |
op_source |
Annales Geophysicae, Vol 20, Pp 477-486 (2002) |
op_relation |
https://www.ann-geophys.net/20/477/2002/angeo-20-477-2002.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-20-477-2002 0992-7689 1432-0576 https://doaj.org/article/3877e6bb2bc34fd0bb101031643c1dc0 |
op_doi |
https://doi.org/10.5194/angeo-20-477-2002 |
container_title |
Annales Geophysicae |
container_volume |
20 |
container_issue |
4 |
container_start_page |
477 |
op_container_end_page |
486 |
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1766400115142033408 |