Azimuthal propagation and frequency characteristic of compressional Pc 5 waves observed at geostationary orbit

Details Azimuthal propagation and frequency characteristic of compressional Pc 5 waves observed at geostationary orbit Azimuthal propagation and frequency characteristic of compressional Pc 5 waves observed at geostationary orbit

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.1473t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Feb. 1, 1985, p. 1473-1485. Research sponsored by the U.S. Department

Physics

75

Compression Waves, Geomagnetic Micropulsations, Wave Propagation, Energetic Particles, Frequency Response, Goes 3, Phase Velocity, Ring Currents

Scientific paper

Properties of compressional Pc 5 waves as deduced from multiple-satellite observations at geosynchronous orbit are presented. The occurrence characteristics of the waves are determined, and the relation between variations in particle fluxes and magnetic field is examined. The spatiotemporal structure of the waves is considered, including the propagation perpendicular to the ambient magnetic field and the relation of the frequency characteristics to harmonic waves. It is demonstrated that the waves have large azimuthal wave numbers from 40 to 120, westward propagation at a typical velocity of 10 km/s, frequency roughly 25 percent of the second harmonic of the poloidal wave, and phase lag of 180 deg between the parallel and radial components of the wave magnetic field and + or -90 deg between the parallel and azimuthal components. These features are discussed in the light of existing theories of instabilities in the ring current plasma.

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