论文标题
在太阳耀斑发作之前，在HALPHA发射中观察到非常长的周期性脉动
Preflare very long-periodic pulsations observed in Halpha emission before the onset of a solar flare
论文作者
论文摘要
在全盘太阳能软X射线（SXR）通量中检测到了预闪相阶段（前VLP）期间的非常长的斑点脉动（参见Tan等人，2016年）。它们可能被视为太阳耀斑的前体，并可能有助于我们更好地理解太阳耀斑的触发机制。在这封信中，我们报告了2015年10月16日的M1.1圆形 - 丝本耀斑发作之前发生的一次前VLP事件。它在Halpha，SXR和Extreme Ultraviolet（EUV）波长中同时观察到，这些波长是由NVST，EVE，EVE和AIA记录的。预闪存-VLP被识别为前光曲线中光曲线中的重复和准周期脉冲，在携带电流的等离子环中，LRC电路振荡可能会调节。可以从Markov Chain Monte Carlo（MCMC）基于贝叶斯（例如Liang etal。2020）的Markov Chain Monte Carlo（MCMC）的傅立叶功率谱（例如〜9.3分钟）确定准周期性。我们介绍了在局部HALPHA线和EUV波长中的预弹力VLP事件的第一份报告，这可以被视为太阳耀斑的前体。因此，这一发现应证明对预测太阳耀斑有用，尤其是对于强大的耀斑。
Very long-periodic pulsations during preflare phases (preflare-VLPs) have been detected in the full-disk solar soft X-Ray (SXR) flux (see Tan et al. 2016). They may be regarded as precursors to solar flares and may help us better understand the trigger mechanism of solar flares. In this letter, we report a preflare-VLP event before the onset of an M1.1 circular-ribbon flare on 2015 October 16. It was simultaneously observed in Halpha, SXR, and extreme ultraviolet (EUV) wavelengths, which were recorded by the NVST, GOES, EVE, and AIA respectively. The preflare-VLP is identified as the repeat and quasi-periodic pulses in light curves during preflare phase, which might be modulated by LRC-circuit oscillation in the current-carrying plasma loop. The quasi-periodicity can be determined from the Fourier power spectrum with Markov chain Monte Carlo (MCMC)-based Bayesian (e.g., Liang et al. 2020), such as ~9.3 minutes. We present the first report of a preflare-VLP event in the local Halpha line and EUV wavelength, which could be considered a precursor of a solar flare. This finding should therefore prove useful for the prediction of solar flares, especially for powerful flares.
