Physics
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ncimc...2..789f&link_type=abstract
(European Geophysical Society, Symposium on Bow Shock, Strasbourg, France, Aug. 31, Sept. 1, 1978.) Nuovo Cimento C, Serie 1, vo
Physics
2
Bow Waves, Low Frequencies, Magnetoacoustic Waves, Shock Waves, Solar Wind, Whistlers, Circular Polarization, Plasma Dynamics, Proton Energy, Solar Terrestrial Interactions, Standing Waves, Upstream, Wave Packets
Scientific paper
A review of three classes of low-frequency (less than 50 Hz) waves observed near the earth's bow shock is presented, including magnetohydrodynamic, whistler and standing waves. Upstream of the shock backstreaming protons generate circularly polarized magnetosonic waves which are convected by the solar wind toward the shock itself. Backstreaming electrons appear to generate low-frequency whistler waves, which are also convected downstream, and related to the magnetosonic waves, low-frequency whistler wave 'packets' with well-defined temporal shapes are observed. For a laminar shock, upstream standing whistler waves in very good agreement with theory have also been detected. It is noted that downstream large-amplitude low-frequency fluctuations appear to be much enhanced in quasi-parallel structures and are reduced in quasi-perpendicular structures.
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