arXiv 2004.043992020-04astro-ph.SR

脉冲加热对平静日冕贡献的第一个无线电证据

First radio evidence for impulsive heating contribution to the quiet solar corona

Surajit Mondal, Divya Oberoi, Atul Mohan

备注：: Published in ApJ Letters
DOI：: 10.3847/2041-8213/ab8817

摘要：

这封信探讨了纳米耀斑为基础的模型加热安静的太阳日冕的相关性。使用米波数据从默奇森宽场阵列，我们提出了第一次成功的检测脉冲排放下降到通量密度的$\sim$ mSFU，约两个数量级弱于早期的尝试。这些脉冲发射的持续时间为$\lesssim 1$ s，并且存在于整个平静的日冕中。这些脉冲发射在给定区域的时间占用分数为$\lesssim 10\%$。这些脉冲发射的直方图遵循幂律分布，并在小的时间尺度上显示出聚类的迹象。我们估计的能量必须倾倒在日冕产生这些脉冲发射是一致的日冕加热的要求。此外，这些脉冲发射的统计特性与帕克太阳探测器（PSP）最近确定的磁之字形非常相似。我们希望这项工作将导致重新关注这些弱脉冲发射与日冕中沉积的能量，从日冕加热的角度来看物理感兴趣的量，并探索它们与PSP观察到的磁之字形的关系。

英文摘要：

This letter explores the relevance of nanoflare based models for heating the quiet sun corona. Using metrewave data from the Murchison Widefield Array, we present the first successful detection of impulsive emissions down to flux densities of $\sim$mSFU, about two orders of magnitude weaker than earlier attempts. These impulsive emissions have durations $\lesssim 1$s and are present throughout the quiet solar corona. The fractional time occupancy of these impulsive emissions at a given region is $\lesssim 10\%$. The histograms of these impulsive emissions follow a powerlaw distribution and show signs of clustering at small timescales. Our estimate of the energy which must be dumped in the corona to generate these impulsive emissions is consistent with the coronal heating requirements. Additionally, the statistical properties of these impulsive emissions are very similar to those recently determined for magnetic switchbacks by the Parker Solar Probe (PSP). We hope that this work will lead to a renewed interest in relating these weak impulsive emissions to the energy deposited in the corona, the quantity of physical interesting from a coronal heating perspective, and explore their relationship with the magnetic switchbacks observed by the PSP.

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