Simultaneous observation of geomagnetic sudden commencement above and below the ionosphere
A geomagnetic sudden commencement (SC) was observed by the low altitude geomagnetic satellite, MAGSAT, when it was flying very closely above a ground station (Magadan in east Siberia, geomagnetic latitude=51.1°) in a duskside (16-17h LT) meridian. The H-component at the satellite showed a positive p...
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Data Analysis Center for Geomagnetism and Spacemagnetism, Faculty of Science, Kyoto University
1985
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ftnipr:oai:nipr.repo.nii.ac.jp:00001751 2023-05-15T17:10:59+02:00 Simultaneous observation of geomagnetic sudden commencement above and below the ionosphere Tohru Araki Toshihiko Iyemori Toyohisa Kamei 1985-07 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1751 http://id.nii.ac.jp/1291/00001751/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1751&item_no=1&attribute_id=18&file_no=1 en eng Data Analysis Center for Geomagnetism and Spacemagnetism, Faculty of Science, Kyoto University https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1751 http://id.nii.ac.jp/1291/00001751/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 36, 114-122(1985-07) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1751&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1985 ftnipr 2022-11-12T19:42:34Z A geomagnetic sudden commencement (SC) was observed by the low altitude geomagnetic satellite, MAGSAT, when it was flying very closely above a ground station (Magadan in east Siberia, geomagnetic latitude=51.1°) in a duskside (16-17h LT) meridian. The H-component at the satellite showed a positive pulse of 52nT and the D-component a negative pulse of 43nT in the beginning part of the SC. The duration of the pulse was 2-3min. The SC observed by normal-run magnetographs at Magadan and other ground stations near the satellite orbit was preceded by a typical preliminary impulse (PI) of which sense is opposite to that of the pulse observed by MAGSAT. By the use of high time resolution data from the IMS magnetometer network Alaska chain, the pulse detected by MAGSAT was identified with the PI observed at the ground stations. It was concluded that the main source current for the PI flowed between the satellite and the ground, that is, in the ionosphere, but effects of other source currents including field aligned currents should be taken into account. Report Memoirs of National Institute of Polar Research Polar Research Alaska Siberia National Institute of Polar Research Repository, Japan Magadan ENVELOPE(150.803,150.803,59.564,59.564) |
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Open Polar |
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National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
description |
A geomagnetic sudden commencement (SC) was observed by the low altitude geomagnetic satellite, MAGSAT, when it was flying very closely above a ground station (Magadan in east Siberia, geomagnetic latitude=51.1°) in a duskside (16-17h LT) meridian. The H-component at the satellite showed a positive pulse of 52nT and the D-component a negative pulse of 43nT in the beginning part of the SC. The duration of the pulse was 2-3min. The SC observed by normal-run magnetographs at Magadan and other ground stations near the satellite orbit was preceded by a typical preliminary impulse (PI) of which sense is opposite to that of the pulse observed by MAGSAT. By the use of high time resolution data from the IMS magnetometer network Alaska chain, the pulse detected by MAGSAT was identified with the PI observed at the ground stations. It was concluded that the main source current for the PI flowed between the satellite and the ground, that is, in the ionosphere, but effects of other source currents including field aligned currents should be taken into account. |
format |
Report |
author |
Tohru Araki Toshihiko Iyemori Toyohisa Kamei |
spellingShingle |
Tohru Araki Toshihiko Iyemori Toyohisa Kamei Simultaneous observation of geomagnetic sudden commencement above and below the ionosphere |
author_facet |
Tohru Araki Toshihiko Iyemori Toyohisa Kamei |
author_sort |
Tohru Araki |
title |
Simultaneous observation of geomagnetic sudden commencement above and below the ionosphere |
title_short |
Simultaneous observation of geomagnetic sudden commencement above and below the ionosphere |
title_full |
Simultaneous observation of geomagnetic sudden commencement above and below the ionosphere |
title_fullStr |
Simultaneous observation of geomagnetic sudden commencement above and below the ionosphere |
title_full_unstemmed |
Simultaneous observation of geomagnetic sudden commencement above and below the ionosphere |
title_sort |
simultaneous observation of geomagnetic sudden commencement above and below the ionosphere |
publisher |
Data Analysis Center for Geomagnetism and Spacemagnetism, Faculty of Science, Kyoto University |
publishDate |
1985 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1751 http://id.nii.ac.jp/1291/00001751/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1751&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(150.803,150.803,59.564,59.564) |
geographic |
Magadan |
geographic_facet |
Magadan |
genre |
Memoirs of National Institute of Polar Research Polar Research Alaska Siberia |
genre_facet |
Memoirs of National Institute of Polar Research Polar Research Alaska Siberia |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1751 http://id.nii.ac.jp/1291/00001751/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 36, 114-122(1985-07) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1751&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766067772790407168 |