Waves observed upstream of interplanetary shocks

Details Waves observed upstream of interplanetary shocks Waves observed upstream of interplanetary shocks

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.5645t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 88, July 1, 1983, p. 5645-5656.

Physics

110

Interplanetary Medium, Magnetohydrodynamic Waves, Shock Waves, Solar Planetary Interactions, Solar Wind, Bow Waves, Cyclotron Resonance, Polarization (Waves), Power Spectra, Shock Wave Propagation

Scientific paper

The properties of the waves that are present upstream of interplanetary, collisionless, quasi-parallel shocks are described. Two types of such waves have been detected, a higher frequency whistler mode wave and a lower frequency fast mode MHD wave. Both are typically circular or elliptically polarized right-hand waves which propagate along the ambient magnetic field with a 15 deg angle cone. The high frequency waves have sufficient group velocities to outrun the shock, and may be generated by cyclotron resonance with 100 eV to 1 keV shock electrons. The lower frequency waves must be generated locally by particles upstream of the shock, probably by 1-10 keV ions flowing away from the shock. Distinct changes in the spectra of upstream waves as a function of distance from the shock have been noted.

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