Multiwavelength observations of a prominence eruption provide an opportunity to uncover the physical mechanism of the triggering and the evolution process of the eruption. In this paper, we investigate a prominence that erupted on 2012 October 14, recorded in Hα, EUV, and X-ray wavelengths. The process of the eruption gives evidence for the existence of a helical magnetic structure showing the twist converting to writhe. The estimated twist is ∼ 6 π (three turns), exceeding the threshold of the kink instability. The rising plasma reached a high speed of 228 km s-1, followed by a sudden rapid acceleration of 2715 m s-2, and was synchronous with a solar flare. Co-spatial cusp-shaped structures were observed in both 131 and 94 Å images from the Atmospheric Imaging Assembly, signifying the location of the magnetic reconnection. The erupted flux rope finally underwent a deceleration with a maximum value of 391 m s-2, which is larger than the freefall acceleration on the Sun (273 m s-2), suggesting that the eruption finally failed, possibly due to an inward magnetic tension force.
Bibliographical noteFunding Information:
We acknowledge the use of data from SMAT/HSOS, AIA/SDO, EUVI/STEREO, and RHESSI. This work is supported by the National Natural Science Foundation of China (grants No. 11703042, 11911530089, U1831107, 11673033, 11427901, 11573012, U1731241, U1531247, 11773038, and 11973056), Strategic Priority Research Program on Space Science of the Chinese Academy of Sciences (grant Nos. XDA15052200, XDA15320302), and the Provincial Natural Science Foundation of Shandong (grant No. ZR2018MA031).
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ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science