A Correlation Between Auroral Kilometric Radiation and Inverted-V Electron Precipitation.
IOWA UNIV IOWA CITY DEPT OF PHYSICS AND ASTRONOMY
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Simultaneous observations of energetic electron precipitations and auroral kilometric radiation AKR were obtained from the polar orbiting satellites AE-D and Hawkeye. The Hawkeye observations were restricted to periods when the satellite was in the AKR emission cone in the northern hemisphere and at radial distances or 7 RE to avoid local propagation cutoff effects. In addition, the AE-D measurements were restricted to complete passes across the auroral oval in the evening to midnight local time sector from 20 to 01 hours magnetic local time. This is the local time region where the most intense bursts of AKR are believed to originate. A qualitative survey of AKR and electron particle precipitation shows that AKR is more closely associated with inverted-V electron precipitation than with plasma sheet precipitation. Quantitatively, a good correlation is found between the AKR intensity and the peak energy of inverted-V events. In addition, in the tail of the most field-aligned portion approx. 0 deg. pitch angle of the distribution functions of the inverted-V events, systematic changes are indicated as the associated AKR intensity increases.
- Atmospheric Physics