A very large scale flow burst observed by the SuperDARN radars
We examined the dynamics of the ionospheric plasma in the dayside sector by using the HF radar data at Iceland West and at Finland from 1100 to 1230 UT on September 5, 1995. During that period, the solar wind density was high and the IMF was strongly southward. The dayside magnetopause was highly co...
Published in: | Journal of Geophysical Research: Space Physics |
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American Geophysical Union
1999
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Online Access: | http://nora.nerc.ac.uk/id/eprint/503601/ https://doi.org/10.1029/1999JA900241 |
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ftnerc:oai:nora.nerc.ac.uk:503601 2023-05-15T16:50:40+02:00 A very large scale flow burst observed by the SuperDARN radars Nishitani, Nozomu Ogawa, Tadahiko Pinnock, Mike Freeman, Mervyn P. Dudeney, John R. Villain, Jean-Paul Baker, Kile B. Sato, Natsuo Yamagishi, Hisao Matsumoto, Haruhisa 1999 http://nora.nerc.ac.uk/id/eprint/503601/ https://doi.org/10.1029/1999JA900241 unknown American Geophysical Union Nishitani, Nozomu; Ogawa, Tadahiko; Pinnock, Mike; Freeman, Mervyn P. orcid:0000-0002-8653-8279 Dudeney, John R.; Villain, Jean-Paul; Baker, Kile B.; Sato, Natsuo; Yamagishi, Hisao; Matsumoto, Haruhisa. 1999 A very large scale flow burst observed by the SuperDARN radars. Journal of Geophysical Research, 104 (A10). 22469-22486. https://doi.org/10.1029/1999JA900241 <https://doi.org/10.1029/1999JA900241> Publication - Article PeerReviewed 1999 ftnerc https://doi.org/10.1029/1999JA900241 2023-02-04T19:37:58Z We examined the dynamics of the ionospheric plasma in the dayside sector by using the HF radar data at Iceland West and at Finland from 1100 to 1230 UT on September 5, 1995. During that period, the solar wind density was high and the IMF was strongly southward. The dayside magnetopause was highly compressed nearly to the geosynchronous orbit. The two radars simultaneously detected a poleward flow burst in the noon sector which, assuming uniformity of flow in the region of the data gap (1.5 MLT) between the two radars, showed a magnetic local time extent of 5 hours. This local time extent is 2 to 3 hours wider than previous results. The maximum poleward plasma velocity of the flow burst is ∼750 m/s, and the latitudinal size of the flow burst region is ∼100 to 200 km. This flow burst region initially expanded in longitude up to 5 hours, and then shifted poleward with a phase speed of 400 to 670 m/s. The flow burst has a duration of ∼20 min. This large-scale poleward flow burst is likely to be due to large-scale reconnection occurring at the dayside magnetopause and subsequent convection as the magnetic field lines are transported across the polar cap. Article in Journal/Newspaper Iceland Natural Environment Research Council: NERC Open Research Archive Journal of Geophysical Research: Space Physics 104 A10 22469 22486 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
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unknown |
description |
We examined the dynamics of the ionospheric plasma in the dayside sector by using the HF radar data at Iceland West and at Finland from 1100 to 1230 UT on September 5, 1995. During that period, the solar wind density was high and the IMF was strongly southward. The dayside magnetopause was highly compressed nearly to the geosynchronous orbit. The two radars simultaneously detected a poleward flow burst in the noon sector which, assuming uniformity of flow in the region of the data gap (1.5 MLT) between the two radars, showed a magnetic local time extent of 5 hours. This local time extent is 2 to 3 hours wider than previous results. The maximum poleward plasma velocity of the flow burst is ∼750 m/s, and the latitudinal size of the flow burst region is ∼100 to 200 km. This flow burst region initially expanded in longitude up to 5 hours, and then shifted poleward with a phase speed of 400 to 670 m/s. The flow burst has a duration of ∼20 min. This large-scale poleward flow burst is likely to be due to large-scale reconnection occurring at the dayside magnetopause and subsequent convection as the magnetic field lines are transported across the polar cap. |
format |
Article in Journal/Newspaper |
author |
Nishitani, Nozomu Ogawa, Tadahiko Pinnock, Mike Freeman, Mervyn P. Dudeney, John R. Villain, Jean-Paul Baker, Kile B. Sato, Natsuo Yamagishi, Hisao Matsumoto, Haruhisa |
spellingShingle |
Nishitani, Nozomu Ogawa, Tadahiko Pinnock, Mike Freeman, Mervyn P. Dudeney, John R. Villain, Jean-Paul Baker, Kile B. Sato, Natsuo Yamagishi, Hisao Matsumoto, Haruhisa A very large scale flow burst observed by the SuperDARN radars |
author_facet |
Nishitani, Nozomu Ogawa, Tadahiko Pinnock, Mike Freeman, Mervyn P. Dudeney, John R. Villain, Jean-Paul Baker, Kile B. Sato, Natsuo Yamagishi, Hisao Matsumoto, Haruhisa |
author_sort |
Nishitani, Nozomu |
title |
A very large scale flow burst observed by the SuperDARN radars |
title_short |
A very large scale flow burst observed by the SuperDARN radars |
title_full |
A very large scale flow burst observed by the SuperDARN radars |
title_fullStr |
A very large scale flow burst observed by the SuperDARN radars |
title_full_unstemmed |
A very large scale flow burst observed by the SuperDARN radars |
title_sort |
very large scale flow burst observed by the superdarn radars |
publisher |
American Geophysical Union |
publishDate |
1999 |
url |
http://nora.nerc.ac.uk/id/eprint/503601/ https://doi.org/10.1029/1999JA900241 |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
Nishitani, Nozomu; Ogawa, Tadahiko; Pinnock, Mike; Freeman, Mervyn P. orcid:0000-0002-8653-8279 Dudeney, John R.; Villain, Jean-Paul; Baker, Kile B.; Sato, Natsuo; Yamagishi, Hisao; Matsumoto, Haruhisa. 1999 A very large scale flow burst observed by the SuperDARN radars. Journal of Geophysical Research, 104 (A10). 22469-22486. https://doi.org/10.1029/1999JA900241 <https://doi.org/10.1029/1999JA900241> |
op_doi |
https://doi.org/10.1029/1999JA900241 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
104 |
container_issue |
A10 |
container_start_page |
22469 |
op_container_end_page |
22486 |
_version_ |
1766040786294538240 |