Item type |
紀要論文(ELS) / Departmental Bulletin Paper(1) |
公開日 |
1985-07-01 |
タイトル |
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言語 |
en |
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タイトル |
Direct contribution of oblique field-aligned currents to magnetic field variations on the ground |
言語 |
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言語 |
eng |
資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
departmental bulletin paper |
ページ属性 |
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内容記述タイプ |
Other |
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内容記述 |
P(論文) |
著者名(英) |
Tamao, Tsutomu
Taniguchi, Haruyuki
Nambu, Mitsuhiro
Miura, Akira
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著者所属(英) |
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en |
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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) |
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内容記述タイプ |
Other |
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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 |
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収録物識別子タイプ |
NCID |
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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
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