Observations of the magnetosphere and ionosphere by Dynamics Explorer satellite. VI - Observations of magnetospheric plasma waves by the DE-1

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Aeronomy, Dynamics Explorer 1 Satellite, Earth Magnetosphere, Plasma Waves, Plasmasphere, Spectrum Analysis, Electric Fields, Polar Regions, Radio Emission, Radio Waves, Very Low Frequencies

Scientific paper

The results of the spectrum analyses of plasma wave electric field (650 Hz to 10 kHz) received from the DE-1 at the Kashima station (Japan) are discussed. The characteristics of chorus, narrow-band hiss, and whistler and ELF hiss observed in the plasmasphere by the DE-1 were found to be approximately the same as those of the corresponding radio emissions observed by the ISIS-1 and ISIS-2 satellites. Electron densities of 0.8-1.1/cu cm were estimated from the upper limit frequency of auroral hiss in the nightside high-latitude magnetosphere. DE-1 data on the lower limit frequency of the Z-mode waves suggest that the geomagnetic field lines in the nightside magnetosphere extend toward the geomagnetic tail. In the low latitudes of the nightside outer radiation zone, electrostatic bursts associated with narrow-band hiss around 1 kHz and those without whistler-mode waves were observed.

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