Department of Earth and Planetary Physics, University of Tokyo
抄録
A sheared flow equilibrium in the magnetosphere‐ionosphere (M‐I) coupling system and its stability against the Kelvin‐Helmholtz (K‐H) instability are investigated within the ideal MHD by using a box‐shaped magnetospheric model. Without forcing, the unperturbed transverse (convection) electric field responsible for the E×B drift declines exponentially with time due to the ionospheric Joule dissipation and the decay (e‐folding) time is larger than one‐half of the Alfvén bounce period. The restoring force due to the line bending associated with the transverse magnetic field is responsible for the existence of a critical height‐integrated Pedersen conductivity ΣPc∼(µoVA)−1, where VA is the average Alfvén velocity along the field line, above which the K‐H instability in the magnetosphere is suppressed completely
雑誌名
Geophysical research letters
巻
23
号
7
ページ
761 - 764
発行年
1996-04
ISSN
00948276
書誌レコードID
AA00657102
DOI
info:doi/10.1029/96GL00598
権利
copyright 1996 by the American Geophysical Union
日本十進分類法
450
出版者
American Geophysical Union
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Stabilization of the Kelvin‐Helmholtz instability by the transverse magnetic field in the Magnetosphere‐Ionosphere Coupling System
GRL_023_007_00761.pdf
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