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  • Particle Acceleration in Solar Flares


    What:
     
    Particle Acceleration in Solar Flares
     
     
     
     
    Who:
    Dr. Sam Krucker
     
    ( Space Science Laboratory, University of California, Berkeley )
     
     
    When:
    Wednesday morning ,July 29th,10:30 a.m.
     
     
       
    Where:
     
     
     
    Room 519, Office Block, 2 West Beijing Road (PMO, CAS)
    Welcome to attend
     
     
       

    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.
    Copyright? Purple Mountain Observatory, CAS, No.10 Yuanhua Road, Qixia District, Nanjing 210023, China
    Phone: 0086 25 8333 2000 Fax: 8333 2091 http://english.pmo.cas.cn