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MICROSCALE STRUCTURES ON THE QUIET SUN AND CORONAL HEATING

机译:安静的太阳和日冕加热的微观结构

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We present some results concerning transient brightenings on the quiet Sun, based on data from the Extreme-Ultraviolet Imaging Telescope on board the Solar and Heliospheric Observatory. Histograms of intensity are found to be well fitted by X' distributions for small values of the intensity, while at high intensities power-law distributions are always observed. Also, the emission presents the same statistical properties when the resolution is downgraded by local averaging, i.e., it appears to be self similar down to the resolution scale of the instruments. These properties are characteristic of the emission from a forced turbulent system whose dissipation scale is much smaller than the pixel dimension. On the basis of the data presented as well as other published results and our present theoretical understanding of MHD turbulence, we discuss the realism of the nanoflare scenario of coronal heating.
机译:我们基于太阳和日球天文台上的极紫外成像望远镜的数据,提出了一些有关在安静的太阳上短暂变亮的结果。对于强度的较小值,强度的直方图被X'分布拟合得很好,而在强度高时,始终观察到幂律分布。同样,当通过局部平均降低分辨率时,发射具有相同的统计属性,即,在仪器的分辨率范围内,它看起来是自相似的。这些特性是强迫湍流系统发射的特征,该系统的耗散尺度远小于像素尺寸。基于所提供的数据以及其他已发表的结果,以及我们目前对MHD湍流的理论理解,我们讨论日冕加热的纳米耀斑情景的现实性。

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