Pre-Flare Heating Around the Temperature Minimum Region Found Right Prior to an X-Class Flare

Details Pre-Flare Heating Around the Temperature Minimum Region Found Right Prior to an X-Class Flare Pre-Flare Heating Around the Temperature Minimum Region Found Right Prior to an X-Class Flare

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mwoc.conf..257k&link_type=abstract

Multi-Wavelength Observations of Coronal Structure and Dynamics -- Yohkoh 10th Anniversary Meeting. Proceedings of the conferenc

Physics

Scientific paper

Studies of magnetic shear developments and pre-flare activities in flare-productive sunspot regions are fundamentally important for the study of flare energy build-up and energy release mechanism. Several previous works demonstrated that the emergence of a twisted magnetic flux rope, which is originally formed in the convection zone, must be the source of the strong magnetic shear development in a sunspot region to produce a strong flare activity (Kurokawa 1987, Tanaka 1991, Ishii et al. 2000). We are still, however, far from sufficiently understanding how the twisted structures of a magnetic flux rope is formed in the convection zone, and where and how such a twisted magnetic rope untwists and releases its energy as flaresNULL A flare productive active region NOAA 9026, which showed an interesting evolution during a coordinated observation between the Domeless Solar Telescope of Hida Observatory, Swedish Telescope of La Palma, and TRACE Satellite from 3 through 12 June of 2000, provided us a rare opportunity to study a new important aspect of a twisted magnetic flux rope and its rapidly-untwisted motions to have caused strong flares. From the analyses of the evolution of this region, we first found a clear evidence of pre-flare heating or energy release from the upper photosphere through the lower chromosphere from about two hours before the energy release in the corona as an X-class flare. We suggest that this pre-flare energy release in the lower atmosphere is closely related to the emergence of the twisted magnetic flux rope from below the photosphere.

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