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● 날짜 : 2015년 7월 30일 (목요일)
● 시간 : 16시 30분
● 장소 : 천문대 영상실
● 강사 : Dr. Sung-Hong Park, National Observatory of Athens
Title : A granule seen in the far wings of the H-alpha line: exceptional darkening before fragmentation
Abstract : Based on high-quality H-alpha observations, I present the exceptional darkening of a quiet Sun granule as seen in the H-alpha far wings before its fragmentation. High-cadence time series of H-alpha imaging spectroscopy measurements obtained by SST/CRISP in a quiet Sun region were analyzed. From the observed H-alpha line profiles, I derived some physical parameters of the granule, such as the Doppler Signal and full-width at half-maximum, and investigate their temporal evolution. The granule first appeared like a typical quiet Sun granule, but then it became dark in both far blue and red wings of the H-alpha line. The darkening phase lasted for about 5 minutes, then the granule split into several small granules. I found that during the darkening phase downflows are observed inside the granule together with an excessive broadening of the spectral line, which seems to be attributed to a temperature increase. I will discuss some possible mechanisms for the darkening and evolution of the granule.
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