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RHESSI X-ray loop and coronal sources of an occulted flare

Published online by Cambridge University Press:  01 November 2006

Y. P. Li  and
W. Q. Gan
Y. P. Li
Affiliation:
Purple Mountain Observatory, Nanjing 210008, China email: [email protected]
W. Q. Gan
Affiliation:
Purple Mountain Observatory, Nanjing 210008, China email: [email protected]
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Abstract

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An occulted flare occurred at about 06:07 UT on November 2, 2002. The RHESSI X-ray images show two separate parts. The lower part consists of a complete loop and the upper part a coronal source which well extends above the solar limb. The loop source shrank for about 4 minutes with a speed of $\sim$24 km s$^{-1}$ during the early impulsive phase and then expanded at $\sim$7 km s$^{-1}$, while the coronal source presented an upward motion at about 6 km s$^{-1}$. The temperature of the loop-top is always higher than that near the footpoints. The temperature of the loop increased with altitude, while that of the coronal source just showed opposite variation. These results indicate that the reconnection X-point of this flare is located in between the loop-top source and the coronal source.

Keywords

Sun: flaresSun: X-raysgamma-raysSun: corona
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S233: Solar Activity and its Magnetic Origin , March 2006 , pp. 393 - 394
Copyright
© 2006 International Astronomical Union