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Direct contribution of oblique field-aligned currents to magnetic field variations on the ground
https://nipr.repo.nii.ac.jp/records/1766
https://nipr.repo.nii.ac.jp/records/1766ff32d59f-42a1-4b04-9ae3-08c11d245e5f
名前 / ファイル | ライセンス | アクション |
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KJ00000012398 (1.3 MB)
|
Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1985-07-01 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Direct contribution of oblique field-aligned currents to magnetic field variations on the ground | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
著者名(英) |
Tamao, Tsutomu
× Tamao, Tsutomu× Taniguchi, Haruyuki× Nambu, Mitsuhiro× Miura, Akira |
|||||
著者所属(英) | ||||||
en | ||||||
Geophysics Research Laboratory, Faculty of Science, University of Tokyo/Geophysics Research Laboratory, Faculty of Science, University of Tokyo/College of General Education, Kyusyu University/Geophysics Research Laboratory, Faculty of Science, University of Tokyo | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Attempt has been made to evaluate a direct contribution of the horizontal component of oblique field-aligned currents to surface magnetic variations in the auroral region associated with a localized electric potential distribution on the horizontal plane, in comparison with that of the ionospheric eddy current. This direct effect is proportional to a product of two ratios, the Pedersen to Hall conductivities and the horizontal to vertical components of the local dipole magnetic intensity. In addition to these, the shorter the horizontal scale-length in the east-west direction compared with that in the north-south direction, the larger the direct effect of field-aligned currents. For the localized perturbation with an isotropic horizontal structure at 60° geomagnetic latitude, it attains to about 80% of the magnetic contribution of the Hall current at the earth's surface. It is also shown that only the vertical component of oblique field-aligned currents connects with the irrotational part of ionospheric currents, and that the effective conductance in the magnetosphere for three-dimensional current systems is reduced to a smaller value than that for the case of vertical field lines. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA00733561 | |||||
書誌情報 |
Memoirs of National Institute of Polar Research. Special issue 巻 36, p. 273-280, 発行日 1985-07 |