Simultaneous equatorial observations of 1- to 30-Hz waves and pitch angle distributions of ring current ions

Physics

Scientific paper

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Extremely Low Frequencies, Ion Cyclotron Radiation, Ring Currents, Tropical Regions, Anisotropic Media, Earth Magnetosphere, Explorer Satellites, Ionic Waves, Magnetic Storms, Pitch (Inclination), Plasmapause, Proton Flux Density, Satellite Observation, Wave Generation

Scientific paper

Eighteen events of large-amplitude (0.4-6 gammas) waves which may be propagating in the ion cyclotron mode have een observed by Explorer 45. Comparison with simultaneously measured proton distributions has allowed the events to be divided into two categories. The first category consists of waves accompanied by enhanced ion fluxes apparently injected into the plasmasphere with anisotropic pitch-angle distributions. This simultaneity suggests that these waves may be generated by the observed ring-current ions. Waves in the second category were found near or outside the plasmapause and were not correlated with any identifiable changes in the observed proton distribution. The generation mechanism for these waves remains unknown.

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