AbstractCoronal hard X-ray (HXR) sources were discovered by the Yohkoh HXT telescope in about two dozen limb flares: Impulsive and gradual ones. On the basis of HXT data, we investigated the spatial evolution of coronal sources. Slow ascending motions of sources are seen in several flares. In five events, it was possible to estimate the velocity of the upward motion with values between 10 and 30km/s. We present these observational results and conclude that coronal source motions should be studied statistically using the RHESSI high-resolution HXR imaging data. We discuss the possibility that coronal HXR emission is generated as bremsstrahlung of the fast electrons accelerated in collapsing magnetic traps due to joint action of the Fermi-type first-order mechanism and betatron acceleration.


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    Title :

    On upward motions of coronal hard X-ray sources in solar flares


    Contributors:
    Somov, B.V. (author) / Kosugi, T. (author) / Bogachev, S.A. (author) / Masuda, S. (author) / Sakao, T. (author)

    Published in:

    Advances in Space Research ; 35 , 10 ; 1690-1699


    Publication date :

    2005-05-25


    Size :

    10 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English