讲座信息

讲座题目：Solar Eruptions and Energetic Particles as diagnosed from radio observations

讲座嘉宾：Dr. Nicole Vilmer（LIRA, Paris Observatory）

讲座主持人：颜毅华（国家空间科学中心）

时间：9月19日15点

地点：线上 腾讯会议 411-8560-2478 (点此入会）                                  

          线下 中关村九章大厦A701会议室 

                   

讲座摘要

As most of the astrophysical objects, the Sun is a strong particle accelerator. Particle acceleration occurs in association with flares and coronal mass ejections (CMEs). While electrons interacting at the Sun produce radio and X-ray emission, they can also escape in the interplanetary medium and be directly detected. At frequencies below 1GHz, radio emissions from energetic electrons are mostly produced through plasma mechanisms. Here, I shall review some of the observations provided by ground-based instruments in Nançay in the decimetric to decametric domain and discuss how they can be used as a diagnostic of electron acceleration and propagation sites. I will also present recent results on the relation between escaping electrons that generate radio type III emissions in the corona and in the interplanetary medium and electrons confined to the lower atmosphere of the Sun that produce HXRs based in particular on data obtained with instruments aboard the Solar Orbiter mission.

嘉宾介绍

Dr. Nicole Vilmer is director of research CNRS emeritus at LIRA (Laboratoired' Instrumentation et de Recherche en Astrophysique )Paris Observatory and PSL Research University. She has been largely involved in the analysis and interpretation of radio observations from the Nançay Radioheliograph and of X-ray and gamma -ray solar observations (RHESSI mission and now STIX experiment on Solar Orbiter). She is currently chair of COSPAR Commission D.