Characteristics and frequency of occurrence of Trimpi events recorded during 1982 at Sanae,Antarctica |
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Institution: | 1. Central University of Finance and Economics, China;2. School of Economics, Renmin University of China, China;3. University of California, Berkeley, United States of America |
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Abstract: | ‘Trimpi’ amplitude perturbations on VLF signals received at Sanae, Antarctica, have been identified using a new computerised technique. Our survey of 1982 data, taken during magnetically disturbed times, shows that events of short duration (<25 s) constitute 60% of all events detected and that all events found are amplitude attenuations with deviations from quiescent levels ranging up to 90%. It is unusual, at Sanae, to observe the causative whistler with a Trimpi event. This, together with further evidence from Trimpi occurrence statistics, may suggest that the gyroresonant interactions responsible for some of the events occur with non-ducted whistler mode waves. A method for estimating the extent of the precipitation region is presented. |
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