On the excitation mechanism of the low-frequency upstream waves

Details On the excitation mechanism of the low-frequency upstream waves On the excitation mechanism of the low-frequency upstream waves

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.6623w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Aug. 1, 1984, p. 6623-6630.

Physics

19

Low Frequencies, Solar Wind, Wave Excitation, Wave Propagation, Cyclotron Resonance, Errors, Power Spectra, Shock Waves, Upstream

Scientific paper

The excitation mechanism of the upstream low-frequency waves (0.01-0.05 Hz) is investigated based on the wave observations. The observed wave frequencies are compared with the frequencies expected from the ion (proton) beam-cyclotron instability process. The beam velocity is estimated from the solar wind parameters using Sonnerup's formula. The analysis supports the hypothesis that these waves are excited by the resonant beam-cyclotron instability. For the waves observed in the deep foreshock region, however, it is found necessary to include the solar wind convection effect on the wave propagation.

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