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- Bhattacharyya A.
- Indian Institute of Geomagnetism
書誌事項
- タイトル別名
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- Time dependency of fluid flow near the
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Fluid flowin the core is assumed to consist of a slowly varying (on time scales > magnetic diffusion time) part and a smaller, rapidly varying part as in the theory of the hydromagnetic dynamo put forward by Braginsky (1965). On the basis of this theory, geomagnetic secular variation models for the last 150 years are used to determine a rapidly varying, axisymmetric, poloidal motion of the fluid near the top of the core as a function of latitude in regions away from the equator. Approximations made in estimating this motion fail near the equator, thus restricting the estimates to latitudes ≥ 40°. Amplitude of the oscillating part of the axisymmetric poloidal flow is found to be ≤ 1 km/yr in the northern hemisphere, and nearly 3 km/yr in some parts of the southern hemisphere. The nature of temporal variation of this component differs significantly between the northern and southern hemispheres during the period under consideration.
収録刊行物
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- Earth, Planets and Space
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Earth, Planets and Space 50 (10), 813-825, 1998
地球電磁気・地球惑星圏学会 、公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会
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詳細情報 詳細情報について
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- CRID
- 1390001206510088320
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- NII論文ID
- 10003736113
- 130003955873
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- NII書誌ID
- AA11211921
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- ISSN
- 18805981
- 13438832
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- NDL書誌ID
- 4614394
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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