A Statistical Study of Solar Type-III Bursts and Auroral Kilometric Radiation Onsets.
IOWA UNIV IOWA CITY DEPT OF PHYSICS AND ASTRONOMY
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Simultaneous occurrences of Type-III solar radio bursts and auroral kilometric radiation were observed by Calvert using ISEE-1 spectrograms. He presented evidence suggesting that the incoming Type-III burst stimulates the onset of auroral kilometric radiation. This paper presents a statistical study of the correlation between Type-III bursts and auroral kilometric radiation. A superposed epoch analysis was performed on as many as 186 Type-III events. The Type-III bursts were detected by the ISEE-3 spacecraft on the sunward side of the earth. At the same time the IMP-8 spacecraft was used to detect onsets of kilometric radiation on the nightside of the earth. For each event, the intensities measured by ISEE-3 Type-III intensities were subtracted from the intensities measured by IMP-8 Type III and possible AKR intensities. The resulting intensities for each event were then added to determine if kilometric radiation was preferentially observed following a Type-III burst. This analysis was performed at frequencies of 100 kHz, 178 kHz and 500 kHz. The results of this study show that a statistically significant correlation exists between incoming Type-III bursts from the sun and kilometric radiation from the earth.
- Atmospheric Physics