The ionospheric response to flux transfer events: the first few minutes
International audience We utilise high-time resolution measurements from the PACE HF radar at Halley, Antarctica to explore the evolution of the ionospheric response during the first few minutes after enhanced reconnection occurs at the magnetopause. We show that the plasma velocity increases associ...
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ftccsdartic:oai:HAL:hal-00316266v1 2023-11-12T04:05:21+01:00 The ionospheric response to flux transfer events: the first few minutes Rodger, A. S. Pinnock, M. British Antarctic Survey (BAS) Natural Environment Research Council (NERC) 1997 https://hal.science/hal-00316266 https://hal.science/hal-00316266/document https://hal.science/hal-00316266/file/angeo-15-685-1997.pdf en eng HAL CCSD European Geosciences Union hal-00316266 https://hal.science/hal-00316266 https://hal.science/hal-00316266/document https://hal.science/hal-00316266/file/angeo-15-685-1997.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316266 Annales Geophysicae, 1997, 15 (6), pp.685-691 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 1997 ftccsdartic 2023-10-21T23:08:39Z International audience We utilise high-time resolution measurements from the PACE HF radar at Halley, Antarctica to explore the evolution of the ionospheric response during the first few minutes after enhanced reconnection occurs at the magnetopause. We show that the plasma velocity increases associated with flux transfer events (FTEs) occur first ~100?200 km equatorward of the region to which magnetosheath (cusp) precipitation maps to the ionosphere. We suggest that these velocity variations start near the ionospheric footprint of the boundary between open and closed magnetic field lines. We show that these velocity variations have rise times ~100 s and fall times of ~10 s. When these velocity transients reach the latitude of the cusp precipitation, sometimes the equatorward boundary of the precipitation begins to move equatorward, the expected and previously reported ionospheric signature of enhanced reconnection. A hypothesis is proposed to explain the velocity variations. It involves the rapid outflow of magnetospheric electrons into the magnetosheath along the most recently reconnected field lines. Several predictions are made arising from the proposed explanation which could be tested with ground-based and space-based observations. Article in Journal/Newspaper Antarc* Antarctica Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Rodger, A. S. Pinnock, M. The ionospheric response to flux transfer events: the first few minutes |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience We utilise high-time resolution measurements from the PACE HF radar at Halley, Antarctica to explore the evolution of the ionospheric response during the first few minutes after enhanced reconnection occurs at the magnetopause. We show that the plasma velocity increases associated with flux transfer events (FTEs) occur first ~100?200 km equatorward of the region to which magnetosheath (cusp) precipitation maps to the ionosphere. We suggest that these velocity variations start near the ionospheric footprint of the boundary between open and closed magnetic field lines. We show that these velocity variations have rise times ~100 s and fall times of ~10 s. When these velocity transients reach the latitude of the cusp precipitation, sometimes the equatorward boundary of the precipitation begins to move equatorward, the expected and previously reported ionospheric signature of enhanced reconnection. A hypothesis is proposed to explain the velocity variations. It involves the rapid outflow of magnetospheric electrons into the magnetosheath along the most recently reconnected field lines. Several predictions are made arising from the proposed explanation which could be tested with ground-based and space-based observations. |
author2 |
British Antarctic Survey (BAS) Natural Environment Research Council (NERC) |
format |
Article in Journal/Newspaper |
author |
Rodger, A. S. Pinnock, M. |
author_facet |
Rodger, A. S. Pinnock, M. |
author_sort |
Rodger, A. S. |
title |
The ionospheric response to flux transfer events: the first few minutes |
title_short |
The ionospheric response to flux transfer events: the first few minutes |
title_full |
The ionospheric response to flux transfer events: the first few minutes |
title_fullStr |
The ionospheric response to flux transfer events: the first few minutes |
title_full_unstemmed |
The ionospheric response to flux transfer events: the first few minutes |
title_sort |
ionospheric response to flux transfer events: the first few minutes |
publisher |
HAL CCSD |
publishDate |
1997 |
url |
https://hal.science/hal-00316266 https://hal.science/hal-00316266/document https://hal.science/hal-00316266/file/angeo-15-685-1997.pdf |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316266 Annales Geophysicae, 1997, 15 (6), pp.685-691 |
op_relation |
hal-00316266 https://hal.science/hal-00316266 https://hal.science/hal-00316266/document https://hal.science/hal-00316266/file/angeo-15-685-1997.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782341962083336192 |