Gyrating ions and large-amplitude monochromatic MHD waves upstream of the earth's bow shock

Details Gyrating ions and large-amplitude monochromatic MHD waves upstream of the earth's bow shock Gyrating ions and large-amplitude monochromatic MHD waves upstream of the earth's bow shock

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90..267t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Jan. 1, 1985, p. 267-273. Research sponsored by the U.S. Department o

Physics

50

Bow Waves, Ion Motion, Magnetohydrodynamic Waves, Monochromatic Radiation, Plasma Oscillations, Cyclotron Resonance, Doppler Effect, Gyration, Shock Waves

Scientific paper

Episodes of nearly monochromatic, low-frequency (0.03 Hz) hydromagnetic waves are occasionally observed upstream of the earth's bow shock. High time resolution (3 s) measurements of two-dimensional ion distributions during two nearly monochromatic wave events reveal that the ion distributions asociated with these waves are 'gyrating ions.' Such distributions consists of suprathermal ions with parallel and perpendicular velocities confined to a fairly narrow range of (nonzero) values. The ions are also often confined to a fairly narrow range of gyrophase angle ('gyrophase bunched'). In one of the two cases, the observed frequency of the waves agrees quite well with the Doppler shifted resonance frequency of waves in right-hand resonance with the observed gyrating ions. In the second case, the observed frequency is lower than the predicted frequency by a factor of 1.5-2.

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