Analysis of geomagnetic data obtained at multi observatories near Syowa Station during the IMS (1976-1978)-Correlation of the location of auroral electrojet current with the aurora and the behavior of geomagnetic conjugacy -
This report describes the movement of small scale auroral electrojet current regions and their relationships to spatial and temporal variation of visual auroras based on magnetic data at three ground stations [Syowa (69°00′S, 39°36′E, 30m a. s. l.), Unmanned (69°47′S, 41°35′E, 1470m a. s. l.) and Mi...
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National Institute of Polar Research
1998
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ftdoajarticles:oai:doaj.org/article:cc1b5249de4044fdae5d5dbccb61b652 2023-05-15T14:01:09+02:00 Analysis of geomagnetic data obtained at multi observatories near Syowa Station during the IMS (1976-1978)-Correlation of the location of auroral electrojet current with the aurora and the behavior of geomagnetic conjugacy - Masaru Ayukawa Kazuo Makita 1998-03-01T00:00:00Z https://doi.org/10.15094/00009027 https://doaj.org/article/cc1b5249de4044fdae5d5dbccb61b652 EN JA eng jpn National Institute of Polar Research http://doi.org/10.15094/00009027 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00009027 0085-7289 2432-079X https://doaj.org/article/cc1b5249de4044fdae5d5dbccb61b652 Antarctic Record, Vol 42, Iss 1, Pp 20-63 (1998) Geography (General) G1-922 article 1998 ftdoajarticles https://doi.org/10.15094/00009027 2022-12-31T00:51:04Z This report describes the movement of small scale auroral electrojet current regions and their relationships to spatial and temporal variation of visual auroras based on magnetic data at three ground stations [Syowa (69°00′S, 39°36′E, 30m a. s. l.), Unmanned (69°47′S, 41°35′E, 1470m a. s. l.) and Mizuho (70°42′S, 44°20′E, 2230m a.s.l.)]. Japanese Antarctic Research Expedition (JARE) party carried out this observation as a contribution to the International Magnetospheric Study (IMS) from 1976 to 1978. It was shown that ionospheric currents with no change in Z-component magnetic field variations corresponded to auroral luminous regions. This result suggests that the line current approximation is applicable to small scale auroral electrojet currents. Secondary, a conjugacy of polar substorm phenomena is examined with comparing magnetogram data obtained from three ground stations in Antarctica and with those from Leirvogur station (64°08′N, 21°47′W), Iceland in the northern hemisphere. During quiet periods, the conjugacy could not be identified due to poor correlation of magnetic field variations between Leirvogur and the three stations in Antarctica. On the other hand, during disturbed periods, the conjugate point of Leirvogur was located near the Unmanned station. Thirdly, the diurnal variation of magnetic conjugate point is examined with magnetogram data of antarctic three ground stations and two stations (Husafell and Leirvogur) of iceland. The conjugate point shifted toward the higher-latitude side from the evening (18h MLT) to the mid-night (00h MLT), while it shifted toward the lower-latitude side from the mid-night to the morning (08h MLT) hours. This result was consistent with the diurnal variation of the conjugate point calculated from the Tsyganenko-Usmanov model. Article in Journal/Newspaper Antarc* Antarctic Antarctica Iceland Directory of Open Access Journals: DOAJ Articles Antarctic Husafell ENVELOPE(-20.893,-20.893,64.700,64.700) Mizuho ENVELOPE(44.317,44.317,-70.683,-70.683) Syowa Station |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English Japanese |
topic |
Geography (General) G1-922 |
spellingShingle |
Geography (General) G1-922 Masaru Ayukawa Kazuo Makita Analysis of geomagnetic data obtained at multi observatories near Syowa Station during the IMS (1976-1978)-Correlation of the location of auroral electrojet current with the aurora and the behavior of geomagnetic conjugacy - |
topic_facet |
Geography (General) G1-922 |
description |
This report describes the movement of small scale auroral electrojet current regions and their relationships to spatial and temporal variation of visual auroras based on magnetic data at three ground stations [Syowa (69°00′S, 39°36′E, 30m a. s. l.), Unmanned (69°47′S, 41°35′E, 1470m a. s. l.) and Mizuho (70°42′S, 44°20′E, 2230m a.s.l.)]. Japanese Antarctic Research Expedition (JARE) party carried out this observation as a contribution to the International Magnetospheric Study (IMS) from 1976 to 1978. It was shown that ionospheric currents with no change in Z-component magnetic field variations corresponded to auroral luminous regions. This result suggests that the line current approximation is applicable to small scale auroral electrojet currents. Secondary, a conjugacy of polar substorm phenomena is examined with comparing magnetogram data obtained from three ground stations in Antarctica and with those from Leirvogur station (64°08′N, 21°47′W), Iceland in the northern hemisphere. During quiet periods, the conjugacy could not be identified due to poor correlation of magnetic field variations between Leirvogur and the three stations in Antarctica. On the other hand, during disturbed periods, the conjugate point of Leirvogur was located near the Unmanned station. Thirdly, the diurnal variation of magnetic conjugate point is examined with magnetogram data of antarctic three ground stations and two stations (Husafell and Leirvogur) of iceland. The conjugate point shifted toward the higher-latitude side from the evening (18h MLT) to the mid-night (00h MLT), while it shifted toward the lower-latitude side from the mid-night to the morning (08h MLT) hours. This result was consistent with the diurnal variation of the conjugate point calculated from the Tsyganenko-Usmanov model. |
format |
Article in Journal/Newspaper |
author |
Masaru Ayukawa Kazuo Makita |
author_facet |
Masaru Ayukawa Kazuo Makita |
author_sort |
Masaru Ayukawa |
title |
Analysis of geomagnetic data obtained at multi observatories near Syowa Station during the IMS (1976-1978)-Correlation of the location of auroral electrojet current with the aurora and the behavior of geomagnetic conjugacy - |
title_short |
Analysis of geomagnetic data obtained at multi observatories near Syowa Station during the IMS (1976-1978)-Correlation of the location of auroral electrojet current with the aurora and the behavior of geomagnetic conjugacy - |
title_full |
Analysis of geomagnetic data obtained at multi observatories near Syowa Station during the IMS (1976-1978)-Correlation of the location of auroral electrojet current with the aurora and the behavior of geomagnetic conjugacy - |
title_fullStr |
Analysis of geomagnetic data obtained at multi observatories near Syowa Station during the IMS (1976-1978)-Correlation of the location of auroral electrojet current with the aurora and the behavior of geomagnetic conjugacy - |
title_full_unstemmed |
Analysis of geomagnetic data obtained at multi observatories near Syowa Station during the IMS (1976-1978)-Correlation of the location of auroral electrojet current with the aurora and the behavior of geomagnetic conjugacy - |
title_sort |
analysis of geomagnetic data obtained at multi observatories near syowa station during the ims (1976-1978)-correlation of the location of auroral electrojet current with the aurora and the behavior of geomagnetic conjugacy - |
publisher |
National Institute of Polar Research |
publishDate |
1998 |
url |
https://doi.org/10.15094/00009027 https://doaj.org/article/cc1b5249de4044fdae5d5dbccb61b652 |
long_lat |
ENVELOPE(-20.893,-20.893,64.700,64.700) ENVELOPE(44.317,44.317,-70.683,-70.683) |
geographic |
Antarctic Husafell Mizuho Syowa Station |
geographic_facet |
Antarctic Husafell Mizuho Syowa Station |
genre |
Antarc* Antarctic Antarctica Iceland |
genre_facet |
Antarc* Antarctic Antarctica Iceland |
op_source |
Antarctic Record, Vol 42, Iss 1, Pp 20-63 (1998) |
op_relation |
http://doi.org/10.15094/00009027 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00009027 0085-7289 2432-079X https://doaj.org/article/cc1b5249de4044fdae5d5dbccb61b652 |
op_doi |
https://doi.org/10.15094/00009027 |
_version_ |
1766270759285555200 |