Study of Ribbon Separation and Magnetic Reconnection Rates in a Two-Ribbon Flare |
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Authors: | W Xie H Zhang H Wang |
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Institution: | (1) National Astronomical Observatories of China, Beijing, 100012, China;(2) Physics Department, New Jersey Institute of Technology, Newark, NJ 07102, USA |
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Abstract: | In this paper, we present a study of the correlation between the speed of flare ribbon separation and the magnetic flux density
during the 10 April 2001 solar flare. The study includes the section of the neutral line containing the flare core and its
peripheral area. This event shows clear two-ribbon structure and inhomogeneous magnetic fields along the ribbons, so the spatial
correlation and distribution of the flare and magnetic parameters can be studied. A weak negative correlation is found between
the ribbon separation speed (V
r) and the longitudinal magnetic flux density (B
z
). This correlation is the weakest around the peak of the flare. Spatially, the correlation is also weakest at the positions
of the hard X-ray (HXR) sources. In addition, we estimate the magnetic reconnection rate (electric field strength in the reconnection
region E
rec) by combining the speed of flare ribbons and the longitudinal magnetic flux density. During flare evolution, the time profiles
of the magnetic reconnection rate are similar to that of the ribbon separation speed, and the speeds of ribbon separation
are relatively slow in the strong magnetic fields (i.e., V
r is negatively correlated with B
z
). However, along the flare ribbons, E
rec fluctuates in a small range except near the HXR source. A localized enhancement of the reconnection rate corresponds to the
position of the HXR source. |
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Keywords: | Solar activity Solar flares Solar magnetic fields |
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