A Correlation between Auroral Kilometric Radiation and Field-Aligned Currents.
IOWA UNIV IOWA CITY DEPT OF PHYSICS AND ASTRONOMY
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Simultaneous observations of field-aligned currents FAC and auroral kilometric radiation AKR are compared from the polar orbiting satellites Triad and Hawkeye. The Triad observations were restricted to the evening-to-midnight local time sector 19 to 01 hours magnetic local time in the northern hemisphere. This is the region where it is believed the most intense storms of AKR originate. The Hawkeye observations were restricted to when the satellite was in the AKR emission cone in the northern hemisphere and at radial distances or 7 RE earth radii to avoid local propagation cutoff effects. A R7 RE2 normalization to the power flux measurements of the kilometric radiation from Hawkeye is used to take into account the radial dependence of this radiation and to scale all intensity measurements such that they are independent of Hawkeyes position in the emission cone. Integrated field-aligned current intensities from Triad are determined from the observed transverse magnetic field disturbances. Statistically, there is a good correlation between the AKR intensity and the integrated curreent sheet intensity of field-aligned currents. It is found that as the intensity of auroral kilometric radiation increases so does the integrated auroral zone current sheet intensity increase.
- Atmospheric Physics
- Electricity and Magnetism