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.

中文翻译：

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使用 VELC/ADITYA-L1 进行 5303 Å 发射线观测的日冕物质抛射开始的新结果


我们使用 ADITYA-L1 上的可见光发射线日冕仪 （VELC） 在 5303 Å 日冕发射线中使用光谱观测报告了日冕物质抛射 （CME） 的开始，这是最近启动的印度首个太空太阳能任务。CME 于 2024 年 7 月 16 日与来自日光位置 S05W85 的 X1.9 级软 X 射线耀斑一起观测到。在 CME 期间，VELC 观测位于太阳西边缘附近。获得的结果有助于限制 CME 的起效时间。此外，它们表明由于质量消耗，CME 源区附近的日冕强度降低了 ≈50%，发射线宽度增加了 ≈15%，红移多普勒速度约为 ≈10 km ^s-1。与线展宽相关的非热速度为 ≈24.87 km s⁻¹。