Study of typical space wave-particle coupling events possibly related with seismic activity

TL;DR

This study analyzes space wave-particle coupling events observed by the DEMETER satellite, linking particle bursts to electromagnetic disturbances and explaining their origins through wave-particle interaction theory, with potential implications for seismic activity.

Contribution

It identifies and characterizes two distinct wave-particle coupling events and infers particle species origins using theoretical calculations, despite instrument limitations.

Findings

Two coupling events observed in February 2010 in specific L-shell range.

Different energy spectra and frequency ranges for electron and proton precipitations.

Particle origins inferred from theory, matching observed electromagnetic disturbances.

Abstract

Based on the DEMETER satellite, we found two space wave-particle coupling events during February 2010 taking place in the range of McIlwain parameter $L$($1.27\sim1.37$). There are strong spatial and temporal correlation between the particle bursts(PBs) and the electromagnetic disturbances of the coupling events. The two PBs show different energy spectrum characteristics, while the corresponding electromagnetic disturbances concentrated on different frequencies range. In agreement with the prediction of the theory of wave-particle interaction, we conclude that the two wave-particle interactions can be probably explained as following: one is electron dominant precipitation with energy of $0.09\sim0.2$ MeV induced by VLF electromagnetic wave with the frequency of $14\sim20$ kHz, and another is proton dominant precipitation with energy of $0.65\sim2.85$ MeV induced by VLF electromagnetic wave with the frequency of $\le 100$ Hz. For the first time, those particle bursts origin, from electron or proton detected by the Instrument for the Detection of Particles(IDP) on board, is inferred by theory calculation, although the Instrument has no ability to identify the particle species.