Physics
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.1205q&link_type=abstract
American Astronomical Society, SPD meeting #42, #12.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Physics
Scientific paper
Many eruptive flares exhibit two extended ribbons in the lower-atmosphere outlining the feet of the post-flare coronal arcade. High-cadence high-resolution UV observations by TRACE reveal that a flare ribbon consists of small patches sequentially brightened along the ribbon, suggesting that reconnection takes place sequentially forming individual post-flare loops along the arcade, as often seen in coronal observations in the EUV wavelengths. These reconnection events and formation of new loops continue into the decay phase. Our recent study (Qiu et al. 2010) further shows that the spatially resolved UV brightness at the foot-points of individual loops grows rapidly on timescales of 1 minute, followed by a long decay on timescales of more than 10 minutes. The rapid rise of UV radiation is correlated with the hard X-ray light curve during the impulsive phase, hence is most likely a direct response of instantaneous heating in the reconnection formed flux tubes. In this study, we utilize the spatially resolved UV brightness time profiles to reconstruct instantaneous heating functions of individual flux tubes, and compute evolution of each flux tube using the EBTEL model (Klimchuk et al. 2008). To build the heating function, we take into account the scaling between the total UV peak count rate, the hard X-ray energy flux derived from RHESSI spectral analysis during the impulsive phase, and as well the reconnection rate that persists from the pre-impulsive phase to the decay phase. The sum of the computed coronal radiation in all the flux tubes compares favorably with the gross coronal radiation observed by GOES. This study presents the first effort to constrain heating functions of flare loops directly using all available observables, and provides a method to examine physics of heating discrete flux tubes formed by reconnection events throughout the flare. The work is supported by NSF grant ATM-0748428.
Liu Wende
Longcope Dana Warfield
Qiu Jiong
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