Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007chjaa...7..721w&link_type=abstract
Chinese Journal of Astronomy and Astrophysics, Volume 7, Issue 5, pp. 721-732 (2007).
Astronomy and Astrophysics
Astrophysics
5
Scientific paper
We analyze an M9.1 two-ribbon solar flare which occurred on 2004 July 22 using the TRACE white-light and 1700 Å images, the RHESSI, and the SOHO/MDI data. We find many small-scale fast-varying brightenings that appeared in the white-light and 1700 Å images along the flare ribbons. Some of them underwent rapid motions in weak magnetic field regions. We identify these short-lived brightenings as UV continuum enhancement. Our preliminary result shows that the brightenings are closely related to the HXR emission. They have a lifetime of 30 60 s and a typical size of about 1'' 2''. The intensity enhancement is about 150 200 times the mean value of the quiet-Sun. According to previous works, we infer that the 1700 Å enhancement may be dominated by the increased emission of 1680 Å continuum coming from the temperature minimum region. The impulsive feature in the 1700 Å light curves of the small-scale brightenings may be due to the irradiation of the impulsive CIV line intensity caused by the bombardment of non-thermal electron beams.
Fang Cheng
Ming-DeDing
Wang Lin
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