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- Title
Multiwavelength Observations of Quasiperiodic Pulsations in the Impulsive Phase of an Eruptive Flare with the Hard X-Ray Imager On Board ASO-S and Other Instruments.
- Authors
Shi, Fanpeng; Li, Dong; Ning, Zongjun; Warmuth, Alexander; Chen, Wei; Su, Yang; Li, Ying; Xu, Jun; Song, Yuxiang; Yang, Yuzhi
- Abstract
We investigated the quasiperiodic pulsations (QPPs) of the X1.2 solar flare (SOL2023-01-06T00:57) based on multi-instrument observations, especially the Hard X-ray Imager (HXI) on board the Advanced Space-based Solar Observatory (ASO-S). The quasiperiod of ≈ 27 s was identified in hard X-rays (HXR) and microwaves using the Markov Chain Monte Carlo method, while no corresponding oscillation was found in soft X-rays. The HXI imaging demonstrates that HXR pulsations arise from the double-footpoint HXR sources. Moreover, the fluctuation of ≈ 27 s period was also present in the nonthermal electron power-law index derived from the X-ray spectra, which is the signature of periodic electron acceleration/precipitation during the impulsive phase. The electron spectral indices not only exhibited the well-known "soft–hard–soft" evolution, but also showed the negative correlation with the HXR pulsations. These results suggest that QPPs directly originate from quasiperiodic injections of accelerated electrons into flare-loop footpoints. We also discuss the possible generation mechanisms for QPPs.
- Subjects
SOLAR flares; MARKOV chain Monte Carlo; SOFT X rays; HARD X-rays; X-ray spectra
- Publication
Solar Physics, 2024, Vol 299, Issue 3, p1
- ISSN
0038-0938
- Publication type
Article
- DOI
10.1007/s11207-024-02272-4