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arXiv 1408.4249astro-ph.SR
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太阳能热辐射原位凝结过程的模拟

Simulating the in situ condensation process of solar prominences

Chun Xia, Rony Keppens, Patrick Antolin, Oliver Porth

摘要:

日冕中的日珥比其周围的温度低和密度高出百倍,总质量为1.e13至1.e15 g。在这里,我们报告的第一个全面的模拟三维,热和重力分层磁通量绳,在原地冷凝到一个突出的发生由于辐射损失。经过一个逐步的热力学调整,我们看到了一个阶段,失控的冷却发生,而逆流剪切流流失质量沿螺旋场线。在这次排水之后,在向上凹的场区中存在着一个类似于日珥的凝结,并且这个日珥的整体特征保持了两个多小时。当日珥凝聚时,日珥建立了一个磁冕过渡区,在失控冷却期间,磁场对准的热传导起作用。日珥结构代表了螺旋形磁绳中的力平衡状态。模拟的冷凝显示了一个右轴承倒钩,作为排水系统的残余。在极紫外波长下的合成图像跟随着凝结的开始,并证实了角的出现和稳定日珥状态的三部分结构,就像在爆发的日珥中经常看到的那样。这自然解释了最近太阳动力学天文台与大气成像组件对日冕洞中的连续性的看法,证明了角。

英文摘要:

Prominences in the solar corona are hundredfold cooler and denser than their surroundings, with a total mass of 1.e13 up to 1.e15 g. Here we report on the first comprehensive simulations of three-dimensional, thermally and gravitationally stratified magnetic flux ropes, where in situ condensation to a prominence happens due to radiative losses. After a gradual thermodynamic adjustment, we witness a phase where runaway cooling happens while counter-streaming shearing flows drain off mass along helical field lines. After this drainage, a prominence-like condensation resides in concave upward field regions, and this prominence retains its overall characteristics for more than two hours. While condensing, the prominence establishes a prominence-corona transition region, where magnetic field-aligned thermal conduction is operative during the runaway cooling. The prominence structure represents a force-balanced state in a helical flux rope. The simulated condensation demonstrates a right-bearing barb, as a remnant of the drainage. Synthetic images at extreme ultraviolet wavelengths follow the onset of the condensation, and confirm the appearance of horns and a three-part structure for the stable prominence state, as often seen in erupting prominences. This naturally explains recent Solar Dynamics Observatory views with the Atmospheric Imaging Assembly on prominences in coronal cavities demonstrating horns.

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