Physics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.4740f&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 92, May 1, 1987, p. 4740-4744. DOE-supported research.
Physics
9
Acoustic Instability, Bow Waves, Ion Acoustic Waves, Ion Beams, Shock Waves, Space Plasmas, International Sun Earth Explorers, Maxwell-Boltzmann Density Function, Plasma Waves, Solar Wind
Scientific paper
This paper considers the generation of enhanced ion acoustic fluctuations by field-aligned ion beams upstream from the earth's bow shock. Steep slopes in the beam distribution parallel and possibly strongly oblique to the magnetic field are correlated with bursts of ion acoustic noise in the upstream region. Linear theory shows that it is the slope of the beam distribution at oblique angles to the magnetic field that determines the growth rate of the ion/ion acoustic instability. Because of instrumentation limitations, it is suggested but not confirmed that enhanced ion acoustic fluctuations in the upstream region and in the presence of field-aligned beams are driven by such steep-sided distributions.
Bame J. Jr. S.
Fuselier Stephen A.
Gary Peter S.
Gurnett Donald A.
Thomsen Michelle F.
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