On quasi-periodic decameter radio emission from Jupiter related to Ganymede

Abstract

The paper discusses the possibility of implementing a plasma generation mechanism in a source of decameter radio emission associated with Ganymede and an explanation based on this mechanism of forming quasi-periodic sequences of bursts of this radiation. According to the discussed model, the registered quasi-periodic sequences of radiation pulses are a consequence of implementing in the source a pulsating mode of plasma wave conversion into extraordinary electromagnetic waves with a small refractive index. The negative frequency drift of the radiation observed in the frequency-time spectrogram is due to the group delay of waves with a small refractive index and the dispersion of the medium. Based on the plasma model, estimates of the plasma parameters in the generation region are obtained, which are in agreement with the data obtained as a result of satellite measurements.