报告题目：Waves and structures in terrestrial quasi-parallel shocks

报告人：汪珊 研究员（北京大学）

报告摘要：At the Earth’s bow shock,the co-existence of incoming and shock reflected particles leads to rich waves and instabilities from fluid to electron scales,forming a turbulent foreshock region. In this presentation,we will introduce basics and some recent progress on understanding these physical processes. An example common pathway starts from ion-ion two stream instabilities,which excite Ultra Low Frequency waves at scales of 10 ion inertia lengths or larger with typical frequencies of 30 s or 3 s in the spacecraft frame. Such waves may further grow into large-amplitude magnetic structures,which behave like small shocks and generate waves at smaller scales,e.g.,1-Hz whistler waves. Distortions of magnetic fields in these waves and structures lead to formation of thin current sheets,where reconnection may occur and facilitate the energy conversion. Utilizing observations and kinetic simulations,we are able to get hints on how each process happens and reveal their associated interactions with particles.

报告时间：2024年5月30日星期四10:00

报告地点：紫金山天文台仙林园区3号楼302会议室

欢迎大家参加！