| Small-Scale Brightenings in the UV Continuum of an M9.1 Solar Flare |
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| 作者姓名： | Lin Wang Cheng Fang Ming-De Ding |
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| 作者单位： | Lin Wang Cheng Fang Ming-De Ding Department of Astronomy，Nanjing University，Nanjing 210093; |
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| 摘 要： | We analyze an M9.1 two-ribbon solar flare which occurred on 2004 July 22 us- ing the TRACE white-light and 1700A~。images,the RHESSI,and the SOHO/MDI data.We find many small-scale fast-varying brightenings that appeared in the white-light and 1700A~。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 1700A~。enhancement may be dominated by the increased emission of 1680 A con- tinuum coming from the temperature minimum region.The impulsive feature in the 1700 A~。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.
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| 关 键 词： | Sun activity—Sun flares—Sun UV radiation |
| 修稿时间： | 2007-01-25 |
Small-Scale Brightenings in the UV Continuum of an M9.1 Solar Flare |
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| Lin Wang Cheng Fang Ming-De Ding.Small-Scale Brightenings in the UV Continuum of an M9.1 Solar Flare[J].Chinese Journal of Astronomy and Astrophysics,2007,7(5):721-732. |
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| Authors: | Lin Wang Cheng Fang Ming-De Ding |
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| Abstract: | We analyze an M9.1 two-ribbon solar flare which occurred on 2004 July 22 using the TRACE white-light and 1700 (A) images, the RHESSI, and the SOHO/MDI data. We find many small-scale fast-varying brightenings that appeared in the white-light and 1700 (A) 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 (A) enhancement may be dominated by the increased emission of 1680 (A) continuum coming from the temperature minimum region. The impulsive feature in the 1700 (A) 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. |
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| Keywords: | Sun activity - Sun flares - Sun UV radiation |
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