Two-Step Reconnections in a C3.3 Flare and Its Preflare Activity Observed by Hinode XRT

Details Two-Step Reconnections in a C3.3 Flare and Its Preflare Activity Observed by Hinode XRT Two-Step Reconnections in a C3.3 Flare and Its Preflare Activity Observed by Hinode XRT

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007pasj...59s.831k&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.59, No.SP3, pp.S831--S836

Astronomy and Astrophysics

Astronomy

3

Sun: Activity, Sun: Corona, Sun: Flares, Sun: Magnetic Fields, Sun: X-Rays

Scientific paper

We investigated the evolution of a C3.3 impulsive flare and its preflare activity, which occurred in NOAA Active Region 10923 on 2006 November 12, using Hinode X-Ray Telescope (XRT) data. For an extensive investigation, we also used GOES X-ray flux, TRACE 171Å, and SOHO MDI data. Examining the time-series of the XRT and TRACE images, we can identify the following evolutionary sequences: (1) There were three bundles of loops along the sheared polarity inversion line forming a sigmoidal structure during the preflare phase. (2) Preflare brightening occurred between two upper-loop bundles, and they consequently formed one larger bundle. (3) The main flare occurred near the location where this new loop bundle and the third bundle met together. (4) As a result, a single stacked loop structure was formed. This morphological evolution of the X-ray loops is quite consistent with a tether-cutting model involving a single-bipole explosion. Our result shows that the preflare and the main flare in this event are a two-step reconnection process, which strongly suggests that the preflare activity plays an important role in triggering the main flare.

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