A multi-satellite study of magnetic pulsations associated with a storm sudden commencement (SSC) as observed at syochronous orbit
Oscillation characteristics of ultra-low frequency (ULF) hydromagnetic waves at synchronous orbit in response to a storm sudden commencement (SSC) are studied on the basis of the magnetic field observed on March 23,1975,simultaneously by the three synchronous satellites, SMS-1,SMS-2 and ATS-6,20 deg...
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Department of Aeronautics and Astronautics, Tokai University/Department of Aeronautics and Astronautics, Tokai University/Department of Aeronautics and Astronautics, Tokai University/Department of Aeronautics and Astronautics, Tokai University
1984
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ftnipr:oai:nipr.repo.nii.ac.jp:00001588 2023-05-15T17:10:59+02:00 A multi-satellite study of magnetic pulsations associated with a storm sudden commencement (SSC) as observed at syochronous orbit Tohru Sakurai Yutaka Tonegawa Kiyoshi Tomomura Yoshio Kato 1984-07 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1588 http://id.nii.ac.jp/1291/00001588/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1588&item_no=1&attribute_id=18&file_no=1 en eng Department of Aeronautics and Astronautics, Tokai University/Department of Aeronautics and Astronautics, Tokai University/Department of Aeronautics and Astronautics, Tokai University/Department of Aeronautics and Astronautics, Tokai University https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1588 http://id.nii.ac.jp/1291/00001588/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 31, 1-11(1984-07) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1588&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1984 ftnipr 2022-11-12T19:42:23Z Oscillation characteristics of ultra-low frequency (ULF) hydromagnetic waves at synchronous orbit in response to a storm sudden commencement (SSC) are studied on the basis of the magnetic field observed on March 23,1975,simultaneously by the three synchronous satellites, SMS-1,SMS-2 and ATS-6,20 degrees apart from one another in longitude. The oscillations exhibited dampedtype, quasi-sinusoidal oscillations. They were purely transverse and azimuthally polarized, indicating a toroidal mode oscillation. The characteristics of the pure toroidal mode oscillation were emphasized with a drastic change of the oscillation component of the magnetic field perturbation from the radial (V) to the azimuthal (D) direction in association with the SSC. The oscillations appeared as a harmonic structure in the frequency. The dominant harmonics were odd ones, i. e. 1st, 3rd, etc. Furthermore, the frequencies of the harmonics observed at each satellite showed a clear local time dependence. In conclusion, the present study verifies that the ULF waves in association with the SSC on March 23,1975 in the afternoonside of the magnetosphere behaved as a clear standing oscillation of toroidal mode of the field line resonance excited by the SSC. Report Memoirs of National Institute of Polar Research Polar Research National Institute of Polar Research Repository, Japan |
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Open Polar |
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National Institute of Polar Research Repository, Japan |
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ftnipr |
language |
English |
description |
Oscillation characteristics of ultra-low frequency (ULF) hydromagnetic waves at synchronous orbit in response to a storm sudden commencement (SSC) are studied on the basis of the magnetic field observed on March 23,1975,simultaneously by the three synchronous satellites, SMS-1,SMS-2 and ATS-6,20 degrees apart from one another in longitude. The oscillations exhibited dampedtype, quasi-sinusoidal oscillations. They were purely transverse and azimuthally polarized, indicating a toroidal mode oscillation. The characteristics of the pure toroidal mode oscillation were emphasized with a drastic change of the oscillation component of the magnetic field perturbation from the radial (V) to the azimuthal (D) direction in association with the SSC. The oscillations appeared as a harmonic structure in the frequency. The dominant harmonics were odd ones, i. e. 1st, 3rd, etc. Furthermore, the frequencies of the harmonics observed at each satellite showed a clear local time dependence. In conclusion, the present study verifies that the ULF waves in association with the SSC on March 23,1975 in the afternoonside of the magnetosphere behaved as a clear standing oscillation of toroidal mode of the field line resonance excited by the SSC. |
format |
Report |
author |
Tohru Sakurai Yutaka Tonegawa Kiyoshi Tomomura Yoshio Kato |
spellingShingle |
Tohru Sakurai Yutaka Tonegawa Kiyoshi Tomomura Yoshio Kato A multi-satellite study of magnetic pulsations associated with a storm sudden commencement (SSC) as observed at syochronous orbit |
author_facet |
Tohru Sakurai Yutaka Tonegawa Kiyoshi Tomomura Yoshio Kato |
author_sort |
Tohru Sakurai |
title |
A multi-satellite study of magnetic pulsations associated with a storm sudden commencement (SSC) as observed at syochronous orbit |
title_short |
A multi-satellite study of magnetic pulsations associated with a storm sudden commencement (SSC) as observed at syochronous orbit |
title_full |
A multi-satellite study of magnetic pulsations associated with a storm sudden commencement (SSC) as observed at syochronous orbit |
title_fullStr |
A multi-satellite study of magnetic pulsations associated with a storm sudden commencement (SSC) as observed at syochronous orbit |
title_full_unstemmed |
A multi-satellite study of magnetic pulsations associated with a storm sudden commencement (SSC) as observed at syochronous orbit |
title_sort |
multi-satellite study of magnetic pulsations associated with a storm sudden commencement (ssc) as observed at syochronous orbit |
publisher |
Department of Aeronautics and Astronautics, Tokai University/Department of Aeronautics and Astronautics, Tokai University/Department of Aeronautics and Astronautics, Tokai University/Department of Aeronautics and Astronautics, Tokai University |
publishDate |
1984 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1588 http://id.nii.ac.jp/1291/00001588/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1588&item_no=1&attribute_id=18&file_no=1 |
genre |
Memoirs of National Institute of Polar Research Polar Research |
genre_facet |
Memoirs of National Institute of Polar Research Polar Research |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1588 http://id.nii.ac.jp/1291/00001588/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 31, 1-11(1984-07) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1588&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766067762861441024 |