Magnetosonic waves above fc(H+) at geostationary orbit - GEOS 2 results

Details Magnetosonic waves above fc(H+) at geostationary orbit - GEOS 2 results Magnetosonic waves above fc(H+) at geostationary orbit - GEOS 2 results

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9510609l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, July 1, 1990, p. 10609-10621.

Physics

19

Geos 2 Satellite, Geosynchronous Orbits, Gyrofrequency, Magnetoacoustic Waves, Radiant Flux Density, Space Plasmas, Electric Fields, Elliptical Polarization, Harmonic Radiation, Magnetospheric Proton Density, Wave Propagation

Scientific paper

Wave electric field data measured by the electric field double-probe experiment on board GEOS 2 are presented for three magnetosonic wave (MSW) events. In the frequency range 1-11 Hz, the ellipticity of the electric field ellipses is about 0.2-0.3, and the sense of rotation is right-handed in the plane perpendicular to the external magnetic field. The orientation of the electric field wave polarization ellipse is related to the direction of propagation of the wave for MSWs; the main axis of the polarization ellipse is almost parallel to the k vector. The MSWs generally propagate azimuthally. The ratio between electric and magnetic field amplitudes is directly related to the phase velocity of the wave and to the refractive index of the plasma in which the latter is propagating. The data are consistent with the generation of MSWs as electromagnetic waves with k azimuthal. The waves refract toward the radial direction, where they become electrostatic and are damped.

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