R. Ramesh, V. Muthu Priyal, Jagdev Singh, K. Sasikumar Raja, P. Savarimuthu and Priya Gavshinde
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引用次数: 0
摘要
我们利用最近发射的印度首次太阳空间任务--ADITYA-L1上的可见发射线日冕仪（VELC）对5303埃日冕发射线进行了光谱观测，报告了日冕物质抛射（CME）的发生情况。该集合放射粒子是在 2024 年 7 月 16 日与来自日像位置 S05W85 的 X1.9 级软 X 射线耀斑同时观测到的。在 CME 期间，VELC 在太阳西缘附近进行了观测。所获得的结果有助于确定该次 CME 的发生时间。此外，它们还表明，由于质量耗竭，CME源区附近的日冕强度降低了≈50%，发射线宽增加了≈15%，多普勒速度红移了大约≈10 km s-1。与线宽相关的非热速度≈24.87 km s-1。
New Results on the Onset of a Coronal Mass Ejection from 5303 Å Emission Line Observations with VELC/ADITYA-L1
We report on the onset of a coronal mass ejection (CME) using spectroscopic observations in the 5303 Å coronal emission line with the Visible Emission Line Coronagraph (VELC) onboard ADITYA-L1, the recently launched first Indian space solar mission. The CME was observed on 2024 July 16 in association with an X1.9 class soft X-ray flare from heliographic location S05W85. The VELC observations were near the west limb of the Sun during the CME. The results obtained helped to constrain the onset time of the CME. In addition, they indicate a ≈50% decrease in the coronal intensity near the source region of the CME due to mass depletion, a ≈15% enhancement in the emission line width, and a redshifted Doppler velocity of about ≈10 km s−1. The nonthermal velocity associated with the line broadening is ≈24.87 km s−1.
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