资源环境科技发展态势分析平台

Plasmaspheric hiss waves are essential for the pitch-angle scattering and precipitation of energetic electrons and interplanetary shocks may affect these waves. We present a case study on the responses of plasmaspheric hiss after an interplanetary shock arrival on 7 September 2017. Based on the observation by RBSP-B, the plasmaspheric hiss in different frequency ranges shows three different responses simultaneously: hiss waves with frequency below 0.08f_ce are weakened, waves within 0.08-0.18f_ce are weakened in magnetic power and modulated by the ultra-low frequency (ULF) waves in the electric power, while waves above 0.18f_ce are intensified in magnetic power and modulated by the ULF waves. Further analysis suggests that the hiss waves have different sources: low-frequency (<∼0.18f_ce) hiss waves are transmitted from chorus outside the plasmasphere, while high-frequency (>∼0.18f_ce) hiss waves are locally amplified. Our results provide a comprehensive view of the frequency-dependent hiss wave behavior after the impact of interplanetary shocks.