题目: Particle Acceleration in Solar Flares

报告人: Dr. S?m Krucker

(Space Science Laboratory, University of California, Berkeley)

Abstract

Solar flares are powered by impulsive releases of magnetic energy stored in the corona. Hard X-ray and gamma-ray observations reveal that as much as half of the released energy goes into particle acceleration. The acceleration mechanisms that provide these efficient conversions of magnetic energy into supra-thermal particles are currently not understood. In the past years however, significant progress has been made on the observational side; thanks in particular to observations by Reuven Ramaty High Energy Spectroscopic Imager (RHESSI), a NASA small explorer mission. RHESSI provides imaging spectroscopy from 3 keV up to 10 MeV allowing us to quantitatively study hard X-ray bremsstrahlung emissions from flare-accelerated electrons, and gamma-ray emissions from flare-accelerated ions. After an extensive introduction, I will review recent observational results obtained by RHESSI. Furthermore, I will briefly describe future instrumentation including a sounding rocket experiment called FOXSI to be launch in 2010 that will test hard X-ray focusing optics for solar observations.

欢迎光临!

时间: 2009年7月29日上午10:30

地点: 紫台5楼会议室

紫金山天文台学术委员会学术交流工作委员会

2009年7月9日