Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80....7f&link_type=abstract
Journal of Geophysical Research, vol. 80, Jan. 1, 1975, p. 7-17. Research supported by the TRW Independent Research Program;
Astronomy and Astrophysics
Astronomy
6
Astronomical Models, Bow Waves, Plasma-Particle Interactions, Shock Wave Profiles, Solar Wind, Wave Generation, Magnetohydrodynamic Waves, Particle Beams, Reflected Waves, Upstream
Scientific paper
A model is proposed for the generation of upstream hydromagnetic waves by proton beams reflected at the earth's bow shock. It is assumed that the reflection process can produce some gyrophase bunching of the protons, thus creating a gyrophase disturbance that propagates with the beam as it streams back along interplanetary field lines. This leads to the production of driven hydromagnetic waves in the left-hand mode. The resulting theory predicts a wave amplitude, frequency, and polarization in the solar wind rest frame. The amplitude depends on the fraction of protons assumed to be phase coherent in their gyromotion and on the plasma beta, beam velocity, temperatures, and the Alfven Mach number. The theory also predicts the Doppler-shifted frequencies and the apparent sense of polarization that would be observed in satellite measurement frames.
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