论文标题
驱动带有微波成像光谱的太阳耀斑的极端粉丝的后期的其他等离子体加热的影响
Implications for additional plasma heating driving the extreme-ultraviolet late phase of a solar flare with microwave imaging spectroscopy
论文作者
论文摘要
极端硫酸酯晚期（ELP）是指在某些太阳耀斑中观察到的第二个极端 - 脱离（EUV）辐射增强，通常发生在软X射线发射峰值之后数十分钟到几个小时。托管ELP发射的冠状环系统通常与主耀斑拱廊不同，其中增强的EUV发射可能意味着额外的加热过程。但是，ELP的起源仍然不清楚。在这里，我们介绍了具有此类ELP的C1.4耀斑的分析，该耀斑在微波波长中也通过扩展的Owens Valley Solar Array（EOVSA）观察到。与ELP的情况相似，我们发现了一个逐渐的微波增强，该增强率是在主要冲动相微波峰后大约三分钟发生的。无线电源与随着时变的微波光谱的ELP环的两个脚点和光谱拟合相吻合，这表明电子与Maxwellian案例的偏差明显偏差，这可能是由于注入的非热电子或向脚关注的非均匀加热而引起的。我们进一步指出，延迟的微波增强表明存在额外的加热过程，这可能导致加热血浆蒸发，从而填充ELP回路，从而产生延长的ELP发射。
Extreme-ultraviolet late phase (ELP) refers to the second extreme-ultraviolet (EUV) radiation enhancement observed in certain solar flares, which usually occurs tens of minutes to several hours after the peak of soft X-ray emission. The coronal loop system that hosts the ELP emission is often different from the main flaring arcade, and the enhanced EUV emission therein may imply an additional heating process. However, the origin of the ELP remains rather unclear. Here we present the analysis of a C1.4 flare that features such an ELP, which is also observed in microwave wavelengths by the Expanded Owens Valley Solar Array (EOVSA). Similar to the case of the ELP, we find a gradual microwave enhancement that occurs about three minutes after the main impulsive phase microwave peaks. Radio sources coincide with both footpoints of the ELP loops and spectral fits on the time-varying microwave spectra demonstrate a clear deviation of the electron distribution from the Maxwellian case, which could result from injected nonthermal electrons or nonuniform heating to the footpoint plasma. We further point out that the delayed microwave enhancement suggests the presence of an additional heating process, which could be responsible for the evaporation of heated plasma that fills the ELP loops, producing the prolonged ELP emission.
