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Surface waves in an incompressible fluid - Resonant instability due to velocity shearThe effects of velocity shear on the resonance absorption of incompressible MHD surface waves are studied. It is found that there are generally values of the velocity shear for which the surface wave decay rate becomes zero. In some cases, the resonance absorption goes to zero even for very small velocity shears. It is also found that the resonance absorption can be strongly enhanced at other values of the velocity shear, so the presence of flows may be generally important for determining the effects of resonance absorption, such as might occur in the interaction of p-modes with sunspots. Resonances leading to instability of the global surface mode can exist, and instability can occur for velocity shears significantly below the Kelvin-Helmholtz threshold. These instabilities may play a role in the development or turbulence in regions of strong velocity shear in the solar wind or the earth's magnetosphere.
Document ID
19900035525
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Hollweg, Joseph V.
(New Hampshire Univ. Durham, NH, United States)
Yang, G.
(New Hampshire, University Durham, United States)
Cadez, V. M.
(Institut za Fiziku Belgrade, Yugoslavia)
Gakovic, B.
(Sarajevo, Univerzitet Yugoslavia)
Date Acquired
August 14, 2013
Publication Date
January 20, 1990
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 349
ISSN: 0004-637X
Subject Category
Plasma Physics
Accession Number
90A22580
Funding Number(s)
CONTRACT_GRANT: NSG-7411
CONTRACT_GRANT: NAGW-76
Distribution Limits
Public
Copyright
Other

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