Observations of diverging field-aligned ion flow with the ESR
International audience We report on observations of a diverging ion flow along the geomagnetic field that is often seen at the EISCAT Svalbard radar. The flow is upward above the peak of the electron density in the F-region and downward below the peak. We estimate that in such events mass transport...
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ftinsu:oai:HAL:hal-00317268v1 2024-04-28T08:17:34+00:00 Observations of diverging field-aligned ion flow with the ESR Buchert, S. C. Ogawa, Y. Fujii, R. van Eyken, A. P. Solar-Terrestrial Environment Laboratory Nagoya (STEL) Nagoya University EISCAT Scientific Association 2004-03-19 https://hal.science/hal-00317268 https://hal.science/hal-00317268/document https://hal.science/hal-00317268/file/angeo-22-889-2004.pdf en eng HAL CCSD European Geosciences Union hal-00317268 https://hal.science/hal-00317268 https://hal.science/hal-00317268/document https://hal.science/hal-00317268/file/angeo-22-889-2004.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317268 Annales Geophysicae, 2004, 22 (3), pp.889-899 [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 2004 ftinsu 2024-04-05T00:38:11Z International audience We report on observations of a diverging ion flow along the geomagnetic field that is often seen at the EISCAT Svalbard radar. The flow is upward above the peak of the electron density in the F-region and downward below the peak. We estimate that in such events mass transport along the field line is important for the ionization balance, and that the shape of the F-layer and its ion composition should be strongly influenced by it. Diverging flow typically occurs when there are signatures of direct entry of sheath plasma to the ionosphere in the form of intense soft particle precipitation, and we suggest that it is caused by the ionization and ionospheric electron heating associated with this precipitation. On average, 30% of all events with ion upflow also show significant ion downflow below. Key words. Ionosphere (polar ionosphere; ionization mechanism; plasma temperature and density) Article in Journal/Newspaper EISCAT Svalbard Institut national des sciences de l'Univers: HAL-INSU |
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Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
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 Buchert, S. C. Ogawa, Y. Fujii, R. van Eyken, A. P. Observations of diverging field-aligned ion flow with the ESR |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience We report on observations of a diverging ion flow along the geomagnetic field that is often seen at the EISCAT Svalbard radar. The flow is upward above the peak of the electron density in the F-region and downward below the peak. We estimate that in such events mass transport along the field line is important for the ionization balance, and that the shape of the F-layer and its ion composition should be strongly influenced by it. Diverging flow typically occurs when there are signatures of direct entry of sheath plasma to the ionosphere in the form of intense soft particle precipitation, and we suggest that it is caused by the ionization and ionospheric electron heating associated with this precipitation. On average, 30% of all events with ion upflow also show significant ion downflow below. Key words. Ionosphere (polar ionosphere; ionization mechanism; plasma temperature and density) |
author2 |
Solar-Terrestrial Environment Laboratory Nagoya (STEL) Nagoya University EISCAT Scientific Association |
format |
Article in Journal/Newspaper |
author |
Buchert, S. C. Ogawa, Y. Fujii, R. van Eyken, A. P. |
author_facet |
Buchert, S. C. Ogawa, Y. Fujii, R. van Eyken, A. P. |
author_sort |
Buchert, S. C. |
title |
Observations of diverging field-aligned ion flow with the ESR |
title_short |
Observations of diverging field-aligned ion flow with the ESR |
title_full |
Observations of diverging field-aligned ion flow with the ESR |
title_fullStr |
Observations of diverging field-aligned ion flow with the ESR |
title_full_unstemmed |
Observations of diverging field-aligned ion flow with the ESR |
title_sort |
observations of diverging field-aligned ion flow with the esr |
publisher |
HAL CCSD |
publishDate |
2004 |
url |
https://hal.science/hal-00317268 https://hal.science/hal-00317268/document https://hal.science/hal-00317268/file/angeo-22-889-2004.pdf |
genre |
EISCAT Svalbard |
genre_facet |
EISCAT Svalbard |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317268 Annales Geophysicae, 2004, 22 (3), pp.889-899 |
op_relation |
hal-00317268 https://hal.science/hal-00317268 https://hal.science/hal-00317268/document https://hal.science/hal-00317268/file/angeo-22-889-2004.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1797582073553223680 |