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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Relationship between extreme ultraviolet microflares and small-scale magnetic fields in the quiet Sun
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Relationship between extreme ultraviolet microflares and small-scale magnetic fields in the quiet Sun

机译：宁静太阳下极端紫外线微耀斑与小规模磁场之间的关系

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摘要

Microflares are small dynamic signatures observed in X-ray and extreme-ultraviolet channels. Because of their impulsive emission enhancements and wide distribution, they are thought to be closely related to coronal heating. By using the high-resolution 171 angstrom images from the Atmospheric Imaging Assembly and the lines-of-sight magnetograms obtained by the Helioseismic and Magnetic Imager on board the Solar Dynamics Observatory, we trace 10794 microflares in a quiet region near the disk center with a field of view of 960 '' x 1068 '' during 24 hr. The microflares have an occurrence rate of 4.4 x 10(3) hr(-1) extrapolated over the whole Sun. Their average brightness, size, and lifetime are 1.7I(0) (of the quiet Sun), 9.6 Mm(2), and 3.6 min, respectively. There exists a mutual positive correlation between the microflares' brightness, area, and lifetime. In general, the microflares distribute uniformly across the solar disk, but form network patterns locally, which are similar to and matched with the magnetic network structures. Typical cases show that the microflares prefer to occur in magnetic cancellation regions of network boundaries. We roughly calculate the upper limit of energy flux supplied by the microflares and find that the result is still a factor of similar to 15 below the coronal heating requirement.
机译：微光斑是在X射线和极端紫外线通道中观察到的小动态信号。由于它们的脉冲发射增强和分布广泛，它们被认为与日冕加热密切相关。通过使用来自大气成像组件的171埃高分辨率图像和太阳动力学天文台上的Helioseismic and Magnetic Imager获得的视线磁图，我们在靠近磁盘中心的安静区域跟踪了10794个微耀斑， 24小时内960''x 1068''的视场。在整个太阳上推断出的微耀斑的发生率为4.4 x 10（3）hr（-1）。它们的平均亮度，大小和寿命分别是（安静太阳下的）1.7I（0），9.6 Mm（2）和3.6分钟。微光斑的亮度，面积和寿命之间存在相互正相关的关系。通常，微火炬均匀分布在整个太阳盘上，但局部形成网络图案，与磁网络结构相似并匹配。典型案例表明，微火炬更喜欢出现在网络边界的磁性抵消区域。我们粗略计算了微火炬提供的能量通量的上限，发现结果仍然比日冕加热需求低约15倍。

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