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Nonlinear evolution of astrophysical Alfven wavesNonlinear Alfven waves were studied using the derivative nonlinear Schrodinger equation as a model. The evolution of initial conditions, such as envelope solitons, amplitude-modulated waves, and band-limited noise was investigated. The last two furnish models for naturally occurring Alfven waves in an astrophysical plasma. A collapse instability in which a wave packet becomes more intense and of smaller spatial extent was analyzed. It is argued that this instability leads to enhanced plasma heating. In studies in which the waves are amplified by an electron beam, the instability tends to modestly inhibit wave growth.
Document ID
19850013984
Document Type
Conference Paper
Authors
Spangler, S. R. (Iowa Univ. Iowa City, IA, United States)
Date Acquired
August 12, 2013
Publication Date
November 1, 1984
Publication Information
Publication: ESA Plasma Astrophys.
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAGW-386
CONTRACT_GRANT: NSF AST-82-17714
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.