Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh13a1516c&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH13A-1516
Other
7519 Flares, 7524 Magnetic Fields, 7526 Magnetic Reconnection (2723, 7835), 7554 X-Rays, Gamma Rays, And Neutrinos
Scientific paper
Double coronal hard and soft X-ray sources in an M1.4 flare have recently been reported by Liu et al. (2008). Non-thermal emissions in the high energy band are observed in the inner region of each source, and thermal emissions in the low energy band are observed in the outer region. The upper source moves downward and the lower source moves upward. Eventually the two sources merge and form a single source. We propose that this observation can be explained by merging of two flux ropes as shown in Choe and Cheng (2000). In a reconnecting current sheet of a flare, a new flux rope can be generated in the lower corona while a pre-born flux rope is ascending in the higher corona. Since the two flux ropes carry axial currents of the same direction, they naturally attract each other. As coronal flux ropes tend to move upward by nature due to the huge inductance of the photosphere, the downward motion of the upper flux rope is mild while the upward acceleration of the lower flux rope is outstanding. In the system of two merging flux ropes, currents are concentrated not only in the current sheet between the two flux ropes, but also in the center of each flux rope. Thus the highest energy X-ray emission comes from the former region and the next highest emissions are from the latter regions. The outer parts of the flux ropes are filled with lower energy plasmas emitting thermal X-ray radiation. We will discuss what coronal conditions favor such formation and merging of two flux ropes.
Cheng C. Z.
Choe Gwang-Son
Kim Hungsoo
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