AKR signal increases caused by triggering

Abstract

This paper presents a study of the amplitude increases which accompany the triggering of auroral kilometric radiation (AKR) by type-III solar radio bursts. IMP-8 data were used to determine the signal increases observed during one-hour periods before and after type-III bursts at 100 kHz, 178 kHz, and 500 kHz, and these were compared with similar observations when the type-III bursts were absent. The results indicate that between 8 to 16 pct of the type-III bursts caused statistically significant intensity increases and that infrequent large signal increases of sometimes 20 dB or more tended to characterize the triggered AKR, rather than a large proportion of small increases.