Abstract

A method for estimating the spatial period of energy release in solar flares is proposed to analyze the present-day satellite observations of arcades of flare coronal loops. The method is based on the application of a Fourier analysis to the difference images of flare arcades in the far ultraviolet. The operation of the method is demonstrated with the observations of the Bastille Day flare from the TRACE spacecraft in the 171 Å channel. The mean spatial period of energy release in the Bastille Day flare determined by the proposed method is 5–8 Mm, in good agreement with the scenario for the development of thermal instability of the preflare current layer in solar flares.

中文翻译：

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太阳耀斑能量释放空间周期的估算方法

摘要

提出了一种估计太阳耀斑能量释放空间周期的方法，以分析当前耀斑日环拱廊的卫星观测结果。该方法基于对远紫外耀斑拱廊差异图像的傅里叶分析的应用。该方法的操作通过 TRACE 航天器在 171 Å 通道中对巴士底日耀斑的观测得到证明。该方法确定的巴士底日耀斑能量释放的平均空间周期为5~8 Mm，与太阳耀斑前耀斑电流层热不稳定性发展的情景非常吻合。