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【云台学术报告】11月23日(周三)上午11:30-11:50 Y12会议室
2016-11-21  |  作者:  |  【  】 【打印】 【关闭

【学术报告】
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报告题目:Ellerman Bombs and Surges in Solar Active Regions

报告人:Heesu Yang

报告人单位:Department of Physics and Astronomy, Seoul National University, Seoul, South Korea

报告时间:2016年11月23日(周三)上午 11:30-11:50

报告地点:Y12会议室

报告语言:中文

报告摘要: 

    Ellerman bombs (EBs) are the transient brightening always found in the far wings of the Balmer lines. It is thought to be a signature of the magnetic reconnection, but it’s mechanism is not fully understood. In this talk, I will introduce my investigation on the photospheric features, magnetic features, and chromospheric features associated with the Ellerman bombs using the 1.6 meter New Solar Telescope at Big Bear Solar Observatory.

    First, I present a comprehensive picture of the total evolution of an EB. I found a granular cell expanding in two opposite directions prior to the EB. When one end of this granule reached the EB site, the transverse speed of the tip of the expanding granule rapidly decreased and the EB is brightened. I also found upflows of the internal mass of the EB, and we found a surge after the occurrence of the EB.

  Second, I investigate the elongated granule-like features (EGFs) that show transverse motions with an average speed of about 3.8 km/s prior to the EBs. The EGFs were found to be accompanied by emerging fluxes (EFs) or moving magnetic features (MMFs).

  Third, I present a surge consisting of multiple shock features. The shock features were overlapped with one another with the time inverval of 110 sec. I found the signature of the magnetic flux cancelations at the base of the surge.

  Our results provide comprehensive understanding of the cause and effect of EBs. The EBs might result from the magnetic reconnection forced by EFs or MMFs that are frequently manifested by EGFs. Furthermore, it is found that the EBs may lead to the multiple shock waves in charge of the surge.

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抚仙湖太阳观测与研究基地

云南天文台学术委员会

邀请人:抚仙湖研究基地,徐稚 15812017567

11月21日

 

 

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