当前位置: X-MOL 学术Sol. Phys. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Quasi-Periodic Pulsations Detected in Ly α $\alpha $ and Nonthermal Emissions During Solar Flares
Solar Physics ( IF 2.8 ) Pub Date : 2021-08-26 , DOI: 10.1007/s11207-021-01876-4
Lei Lu 1, 2 , Dong Li 1, 2 , Zongjun Ning 1, 3 , Li Feng 1, 3 , Weiqun Gan 1, 3
Affiliation  

We report quasi-periodic pulsations (QPPs) with double periods during three solar flares (viz. SOL2011-Feb-15T01:44, SOL2011-Sep-25T04:31, SOL2012-May-17T01:25). The flare QPPs were observed from light curves in Ly-\(\alpha \), hard X-ray (HXR), and microwave emissions, with the Ly-\(\alpha \) emission recorded by the Geostationary Operational Environmental Satellite, the HXR emission recorded by the Reuven Ramaty High-Energy Solar Spectroscopic Imager and the Fermi Gamma-ray Burst Monitor, and the microwave emission recorded by the Nobeyama Radio Polarimeters and Radioheliograph. By using the Markov chain Monte Carlo (MCMC) method, QPPs with double periods of about two minutes and one minute were first found in the Ly-\(\alpha \) emission. Then using the same method, a QPP with nearly the same period of about two minutes was also found in HXR and microwave emissions. Considering the possible common origin (nonthermal electrons) between Ly-\(\alpha \) and HXR/microwave emission, we suggest that the two-minute QPP results from the periodic acceleration of nonthermal electrons during magnetic reconnections. The ratio between the double periods in the Ly-\(\alpha \) emission was found to be close to two, which is consistent with the theoretical expectation between the fundamental and harmonic modes. However, we cannot rule out other possible driving mechanisms for the one-minute QPPs in HXR/microwave emissions due to their relatively large deviations.



中文翻译:

在太阳耀斑期间在 Ly α $\alpha $ 和非热辐射中检测到的准周期性脉动

我们报告了三个太阳耀斑期间具有双周期的准周期性脉动 (QPP)(即 SOL2011-Feb-15T01:44、SOL2011-Sep-25T04:31、SOL2012-May-17T01:25)。耀斑 QPP 是从 Ly- \(\alpha\)、硬 X 射线 (HXR) 和微波发射的光曲线观察到的,其中 Ly - \(\alpha\)发射由地球同步运行环境卫星记录,通过记录HXR发射鲁文·拉马第高能太阳光谱成像仪费米伽马射线爆发监控,并通过记录的发射微波野边山广播偏光Radioheliograph. 通过使用马尔可夫链蒙特卡罗 (MCMC) 方法,首次在 Ly- \(\alpha\)发射中发现了双周期约 2 分钟和 1 分钟的 QPP 。然后使用相同的方法,在 HXR 和微波发射中也发现了几乎相同的大约两分钟的 QPP。考虑到 Ly- \(\alpha\)和 HXR/微波发射之间可能的共同起源(非热电子),我们建议两分钟 QPP 是由磁重联期间非热电子的周期性加速产生的。Ly- \(\alpha \) 中双周期之间的比率发现发射接近于 2,这与基模和谐波模式之间的理论预期一致。然而,由于其相对较大的偏差,我们不能排除 HXR/微波发射中一分钟 QPP 的其他可能驱动机制。

更新日期:2021-08-26
down
wechat
bug