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Thermal and Driven Stochastic Growth of Langmuir Waves in the Solar Wind and Earth's ForeshockStatistical distributions of Langmuir wave fields in the solar wind and the edge of Earth's foreshock are analyzed and compared with predictions for stochastic growth theory (SGT). SGT quantitatively explains the solar wind, edge, and deep foreshock data as pure thermal waves, driven thermal waves subject to net linear growth and stochastic effects, and as waves in a pure SGT state, respectively, plus radiation near the plasma frequency f(sub p). These changes are interpreted in terms of spatial variations in the beam instability's growth rate and evolution toward a pure SGT state. SGT analyses of field distributions are shown to provide a viable alternative to thermal noise spectroscopy for wave instruments with coarse frequency resolution, and to separate f(sub p) radiation from Langmuir waves.
Document ID
20020033988
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Cairns, Iver H. (Sydney Univ. Australia)
Robinson, P. A. (Sydney Univ. Australia)
Anderson, R. R. (Iowa Univ. Iowa City, IA United States)
Date Acquired
August 20, 2013
Publication Date
January 1, 2000
Publication Information
Publication: Geophysical Research Letters
Volume: 27
Issue: 1
ISSN: 0094-8276
Subject Category
Solar Physics
Report/Patent Number
Paper-1999GL010717
Funding Number(s)
CONTRACT_GRANT: NAG5-6127
CONTRACT_GRANT: NAG5-6369
Distribution Limits
Public
Copyright
Other