Abstract

During a solar flare, the magnetic energy of ~10³² erg is released in a few dozens of minutes. The invariability of the magnetic field on the solar surface during flares proves the appearance of a flare in the corona. An analysis of the dynamics of the electron temperature of the solar atmosphere provides independent evidence of the coronal origin of the flare. The appearance of the flare in the corona is explained by the release of the energy accumulated in the magnetic field of the current sheet. To study the flare situation, numerical MHD simulation was performed for a real active region. The simulation results showed the appearance of a current sheet, which position coincides with the position of the observed source of thermal X-ray emission. A methodology for calculations in real time scale has been developed. Based on the mechanism of energy release in the current sheet, an electrodynamic model of a solar flare is proposed, which explains its main observed manifestations. Sources of hard X-ray emission appear due to deceleration in the lower dense layers of the solar atmosphere of electron beams accelerated in field-aligned currents. The acceleration of solar cosmic rays occurs in the current sheet by the electric field E = –V × B/c, and not in shock waves.

中文翻译：

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基于太阳日冕中电流片磁场中能量累积的太阳耀斑的物理机制

摘要

在太阳耀斑期间，磁能为〜10 ³²erg在几十分钟内被释放。耀斑期间太阳表面磁场的不变性证明了日冕中耀斑的出现。对太阳大气电子温度动态的分析提供了火炬冠状起源的独立证据。电晕中耀斑的出现是由电流板磁场中积累的能量释放引起的。为了研究耀斑情况，对实际活动区域进行了数值MHD仿真。仿真结果显示了当前工作表的外观，该位置与观察到的热X射线源的位置一致。已经开发出一种用于实时规模计算的方法。根据当前工作表中的能量释放机制，提出了太阳耀斑的电动力学模型，解释了它的主要观测表现。硬X射线发射源的出现是由于在电场对准的电流中加速的电子束在太阳大气的较低致密层中的减速。太阳宇宙射线的加速在电场中通过电流发生E = – V × B / c，而不是在冲击波中。