Observations of diverging field-aligned ion flow with the ESR

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...

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Published in:Annales Geophysicae
Main Authors: Buchert, S. C., Ogawa, Y., Fujii, R., van Eyken, A. P.
Format: Article in Journal/Newspaper
Language:English
Published: Copernicus Publications 2004
Subjects:
Online Access:https://doi.org/10.5194/angeo-22-889-2004
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spelling ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00035004 2023-05-15T16:04:40+02:00 Observations of diverging field-aligned ion flow with the ESR Buchert, S. C. Ogawa, Y. Fujii, R. van Eyken, A. P. 2004-03 electronic https://doi.org/10.5194/angeo-22-889-2004 https://noa.gwlb.de/receive/cop_mods_00035004 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00034958/angeo-22-889-2004.pdf https://angeo.copernicus.org/articles/22/889/2004/angeo-22-889-2004.pdf eng eng Copernicus Publications Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576 https://doi.org/10.5194/angeo-22-889-2004 https://noa.gwlb.de/receive/cop_mods_00035004 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00034958/angeo-22-889-2004.pdf https://angeo.copernicus.org/articles/22/889/2004/angeo-22-889-2004.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2004 ftnonlinearchiv https://doi.org/10.5194/angeo-22-889-2004 2022-02-08T22:44:56Z 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 Niedersächsisches Online-Archiv NOA Svalbard Annales Geophysicae 22 3 889 899
institution Open Polar
collection Niedersächsisches Online-Archiv NOA
op_collection_id ftnonlinearchiv
language English
topic article
Verlagsveröffentlichung
spellingShingle article
Verlagsveröffentlichung
Buchert, S. C.
Ogawa, Y.
Fujii, R.
van Eyken, A. P.
Observations of diverging field-aligned ion flow with the ESR
topic_facet article
Verlagsveröffentlichung
description 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)
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 Copernicus Publications
publishDate 2004
url https://doi.org/10.5194/angeo-22-889-2004
https://noa.gwlb.de/receive/cop_mods_00035004
https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00034958/angeo-22-889-2004.pdf
https://angeo.copernicus.org/articles/22/889/2004/angeo-22-889-2004.pdf
geographic Svalbard
geographic_facet Svalbard
genre EISCAT
Svalbard
genre_facet EISCAT
Svalbard
op_relation Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576
https://doi.org/10.5194/angeo-22-889-2004
https://noa.gwlb.de/receive/cop_mods_00035004
https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00034958/angeo-22-889-2004.pdf
https://angeo.copernicus.org/articles/22/889/2004/angeo-22-889-2004.pdf
op_rights uneingeschränkt
info:eu-repo/semantics/openAccess
op_doi https://doi.org/10.5194/angeo-22-889-2004
container_title Annales Geophysicae
container_volume 22
container_issue 3
container_start_page 889
op_container_end_page 899
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