Geophysics Research Laboratory, University of Tokyo
抄録
It is demonstrated by means of a MHD simulation that a finite thick velocity shear layer with super‐Alfvénic velocity jump is unstable to the Kelvin‐Helmholtz (KH) instability no matter how large the sonic Mach number, a result suggesting that the tail flank boundary is unstable to the KH instability. For supersonic shear flow the unstable mode becomes damped‐oscillatory in the magnetosheath. For both subsonic and supersonic shear flows, the energy flux density into the magnetosphere by the KH instability is large enough to replenish the plasma in the low latitude boundary layer with the tailward flow kinetic energy of observed intensity. A significant fraction of the energy flux density can reach deeper into the magnetosphere and its intensity is comparable to an energy flux density required for excitation of a ULF wave in the magnetosphere
雑誌名
Geophysical research letters
巻
17
号
6
ページ
749 - 752
発行年
1990-05
ISSN
00948276
書誌レコードID
AA00657102
DOI
info:doi/10.1029/GL017i006p00749
権利
copyright 1990 by the American Geophysical Union
日本十進分類法
450
出版者
American Geophysical Union
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Kelvin‐Helmholtz instability for supersonic shear flow at the magnetospheric boundary
GRL_017_006_00749.pdf
(455.19KB)
