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 \(\approx 27\text{ s}\) 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 \(\approx 27\text{ s}\) 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.
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Data Availability
ASO-S data: http://aso-s.pmo.ac.cn/sodc/dataArchive.jsp. SolO data: https://soar.esac.esa.int/soar/. SDO data: http://jsoc.stanford.edu. KW data: http://www.ioffe.ru/LEA/kwsun/. NoRP data: http://solar.nro.nao.ac.jp/norp/index.html. GOES and Fermi data can be downloaded via SSW. CBS data can be obtained by contacting the instrument team.
Materials Availability
The movie (aia94_movie.mp4) of Figure 1 is available.
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Acknowledgment
We thank the referee for valuable comments. ASO-S mission is supported by the Strategic Priority Research Program on Space Science, the Chinese Academy of Sciences, Grant No. XDA15320000. Solar Orbiter is a space mission of international collaboration between ESA and NASA, operated by ESA. We appreciate the teams of GOES, SDO, Fermi, KW, NoRP, and CBS for their open data-use policy.
Funding
This work is supported by the Strategic Priority Research Program of the Chinese Academy of Sciences, Grant No. XDB0560000. This work is also funded by the National Key R&D Program of China2022YFF0503002 (2022YFF0503000), NSFC under grants 12073081, 12333010, and 11820101002.
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Shi, F., Li, D., Ning, Z. et al. 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. Sol Phys 299, 30 (2024). https://doi.org/10.1007/s11207-024-02272-4
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DOI: https://doi.org/10.1007/s11207-024-02272-4