Statistical Study on Propagation Characteristics of Chorus in the Earth's Magnetosphere
The frequency and normal angle of chorus waves are the key parameters affecting its inter-action with electrons.Statistical analysis of Van Allen satellite data from 1 January 2013 to 31 Decem-ber 2015,indicates that the strong chorus waves(＞7×10-4 mV2·m-2·Hz-1)tend to appear in a narrower frequency range(0.3～0.4 fce)at normal angle θ around 35°.As L increases,the trend of narrowing cho-rus wave spectrum at θ≈35° becomes more pronounced.From the night to the dawn(21:00 MLT-09:00 MLT),chorus waves can be observed within a frequency range of 0.1～0.8 fce,but the spectral width of chorus waves at θ≈35° on the nightside is narrower than that on the dawn.From the morning to the dusk(09:00 MLT-21:00 MLT),the electric power spectral density of chorus waves decreases significant-ly,mainly manifesting as lower band chorus waves with oblique propagation(θ＞60°).With increasing magnetic latitude(λMLAT),the upper band chorus waves diminish rapidly,and the electric power spec-tral density of the lower band chorus waves at θ≈35° also gradually decreases.This study reveals the distribution characteristics of chorus wave intensity in terms of frequency and the normal angle in differ-ent regions,providing crucial information for constructing a more accurate global model of chorus wave-electron interactions.
Radiation beltsVan Allen ProbesStatistical analysisChorusNormal angle
万方数据
维普
