Multi-instrument observations of nightside plasma patches under conditions of IMF Bz positive
Results are presented from two multi-instrument case studies showing patches of cold, long-lived plasma in the winter nightside ionosphere during times when the z-component of the Interplanetary Magnetic Field (IMF Bz) was positive. These enhancements were coincident with the antisunward convective...
Published in: | Annales Geophysicae |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus on behalf of the European Geosciences Union
2008
|
Subjects: | |
Online Access: | http://irep.ntu.ac.uk/id/eprint/18900/ http://irep.ntu.ac.uk/id/eprint/18900/1/PubSub4469_Wood.pdf https://doi.org/10.5194/angeo-26-2203-2008 |
id |
ftnottinghtrentu:oai:irep.ntu.ac.uk:18900 |
---|---|
record_format |
openpolar |
spelling |
ftnottinghtrentu:oai:irep.ntu.ac.uk:18900 2023-05-15T16:04:45+02:00 Multi-instrument observations of nightside plasma patches under conditions of IMF Bz positive Wood, AG Pryse, SE Middleton, HR Howells, VSC 2008 text http://irep.ntu.ac.uk/id/eprint/18900/ http://irep.ntu.ac.uk/id/eprint/18900/1/PubSub4469_Wood.pdf https://doi.org/10.5194/angeo-26-2203-2008 en eng Copernicus on behalf of the European Geosciences Union http://irep.ntu.ac.uk/id/eprint/18900/1/PubSub4469_Wood.pdf WOOD, A.G., PRYSE, S.E., MIDDLETON, H.R. and HOWELLS, V.S.C., 2008. Multi-instrument observations of nightside plasma patches under conditions of IMF Bz positive. Annales Geophysicae, 26 (8), pp. 2203-2216. ISSN 0992-7689 doi:10.5194/angeo-26-2203-2008 Article PeerReviewed 2008 ftnottinghtrentu https://doi.org/10.5194/angeo-26-2203-2008 2022-01-09T07:01:42Z Results are presented from two multi-instrument case studies showing patches of cold, long-lived plasma in the winter nightside ionosphere during times when the z-component of the Interplanetary Magnetic Field (IMF Bz) was positive. These enhancements were coincident with the antisunward convective plasma drift, flowing from polar to nightside auroral latitudes. In the first case, on 5 December 2005 with IMF By negative, two regions of enhanced electron density were observed extended in MLT in the magnetic midnight sector separated by lower densities near midnight. It is likely that the earlier enhancement originated on the dayside near magnetic noon and was transported to the nightside sector in the convective flow, whilst the later feature originated in the morning magnetic sector. The lower densities separating the two enhancements were a consequence of a pair of lobe cells essentially blocking the direct antisunward cross polar flow from the dayside. A second case study on 4 February 2006 with IMF By positive revealed a single nightside enhancement likely to have originated in the morning magnetic sector. These multi-instrument investigations, incorporating observations by the EISCAT radar facility, the SuperDARN network and radio tomography, reveal that plasma flowing from the dayside can play a significant role in the nightside ionosphere under conditions of IMF Bz positive. The observations are reinforced by simulations of flux-tube transport and plasma decay. Article in Journal/Newspaper EISCAT Nottingham Trent University's Institutional Repository (IRep) Annales Geophysicae 26 8 2203 2216 |
institution |
Open Polar |
collection |
Nottingham Trent University's Institutional Repository (IRep) |
op_collection_id |
ftnottinghtrentu |
language |
English |
description |
Results are presented from two multi-instrument case studies showing patches of cold, long-lived plasma in the winter nightside ionosphere during times when the z-component of the Interplanetary Magnetic Field (IMF Bz) was positive. These enhancements were coincident with the antisunward convective plasma drift, flowing from polar to nightside auroral latitudes. In the first case, on 5 December 2005 with IMF By negative, two regions of enhanced electron density were observed extended in MLT in the magnetic midnight sector separated by lower densities near midnight. It is likely that the earlier enhancement originated on the dayside near magnetic noon and was transported to the nightside sector in the convective flow, whilst the later feature originated in the morning magnetic sector. The lower densities separating the two enhancements were a consequence of a pair of lobe cells essentially blocking the direct antisunward cross polar flow from the dayside. A second case study on 4 February 2006 with IMF By positive revealed a single nightside enhancement likely to have originated in the morning magnetic sector. These multi-instrument investigations, incorporating observations by the EISCAT radar facility, the SuperDARN network and radio tomography, reveal that plasma flowing from the dayside can play a significant role in the nightside ionosphere under conditions of IMF Bz positive. The observations are reinforced by simulations of flux-tube transport and plasma decay. |
format |
Article in Journal/Newspaper |
author |
Wood, AG Pryse, SE Middleton, HR Howells, VSC |
spellingShingle |
Wood, AG Pryse, SE Middleton, HR Howells, VSC Multi-instrument observations of nightside plasma patches under conditions of IMF Bz positive |
author_facet |
Wood, AG Pryse, SE Middleton, HR Howells, VSC |
author_sort |
Wood, AG |
title |
Multi-instrument observations of nightside plasma patches under conditions of IMF Bz positive |
title_short |
Multi-instrument observations of nightside plasma patches under conditions of IMF Bz positive |
title_full |
Multi-instrument observations of nightside plasma patches under conditions of IMF Bz positive |
title_fullStr |
Multi-instrument observations of nightside plasma patches under conditions of IMF Bz positive |
title_full_unstemmed |
Multi-instrument observations of nightside plasma patches under conditions of IMF Bz positive |
title_sort |
multi-instrument observations of nightside plasma patches under conditions of imf bz positive |
publisher |
Copernicus on behalf of the European Geosciences Union |
publishDate |
2008 |
url |
http://irep.ntu.ac.uk/id/eprint/18900/ http://irep.ntu.ac.uk/id/eprint/18900/1/PubSub4469_Wood.pdf https://doi.org/10.5194/angeo-26-2203-2008 |
genre |
EISCAT |
genre_facet |
EISCAT |
op_relation |
http://irep.ntu.ac.uk/id/eprint/18900/1/PubSub4469_Wood.pdf WOOD, A.G., PRYSE, S.E., MIDDLETON, H.R. and HOWELLS, V.S.C., 2008. Multi-instrument observations of nightside plasma patches under conditions of IMF Bz positive. Annales Geophysicae, 26 (8), pp. 2203-2216. ISSN 0992-7689 doi:10.5194/angeo-26-2203-2008 |
op_doi |
https://doi.org/10.5194/angeo-26-2203-2008 |
container_title |
Annales Geophysicae |
container_volume |
26 |
container_issue |
8 |
container_start_page |
2203 |
op_container_end_page |
2216 |
_version_ |
1766400381392257024 |