Chorus Source Locations from VLF Poynting Flux Measurements with the Polar Spacecraft

Details Chorus Source Locations from VLF Poynting Flux Measurements with the Polar Spacecraft Chorus Source Locations from VLF Poynting Flux Measurements with the Polar Spacecraft

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.4063l&link_type=abstract

Geophysical Research Letters, vol. 25, p. 4063

Physics

68

Very Low Frequencies, Magnetic Equator, Magnetic Fields, Electrical Measurement, Surveys, Position (Location), Polar Regions, Landau Damping

Scientific paper

Previous studies have used indirect evidence to argue that whistler-mode chorus emissions are generated near the magnetic equator. In this paper a spatial survey of wave normals and Poynting vectors computed from three-component electric and magnetic field measurements is used to show that chorus is generated very close to the magnetic equator. One surprising result is that there are almost no chorus emissions propagating toward the magnetic equator, such as might be expected from high-latitude magnetospheric reflections. The absence of a reflected component indicates that the chorus is reabsorbed, probably by Landau damping, before returning to the magnetic equatorial plane.

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