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arXiv 1507.04057astro-ph.SR
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2012年3月12日极区日冕物质抛射的运动学和能量特性

Kinematic and Energetic Properties of the 2012 March 12 Polar Coronal Mass Ejection

N. Gopalswamy, S. Yashiro, S. Akiyama

摘要:

我们报告了2012年3月12日极地日冕物质抛射(CME)的能量学,起源于南纬60度。极地日冕物质抛射在几乎所有方面都与低纬度日冕物质抛射相似:三部分形态、喷发后拱廊(PEA)、日冕物质抛射和暗条运动学、日冕物质抛射质量和动能以及喷发后拱廊的相对热能含量。从偏振亮度图像,我们估计的CME质量,这是接近低纬度CME的平均质量。日冕物质抛射的动能(3.3 × 1030尔格)也是日冕物质抛射总体的典型特征。从光球磁图,我们估计的自由能(1.8 × 1031尔格)在极冠源区,我们发现这是足够的电源CME和PEA。大约19%的自由能进入CME的动能。我们计算了PEA的热能含量(2.3 × 1029 erg),发现它是CME动能的一小部分(6.8%)。这部分是非常相似的,在活动区的CME与主要耀斑。我们还表明,2012年3月12日是第24周最大阶段观测到的数十次极地日冕物质抛射之一。第24周的极冠日珥爆发与CME的关联率与低纬度地区相同。这项调查支持这样的观点,即所有的日冕物质抛射是从封闭的磁场区域,无论其在太阳上的位置(极冠灯丝区域,静态灯丝区域或活动区域)。

英文摘要:

We report on the energetics of the 2012 March 12 polar coronal mass ejection (CME) originating from a southern latitude of ~60o. The polar CME is similar to low-latitude CMEs in almost all respects: three-part morphology, post eruption arcade (PEA), CME and filament kinematics, CME mass and kinetic energy, and the relative thermal energy content of the PEA. From polarized brightness images, we estimate the CME mass, which is close to the average mass of low-latitude CMEs. The CME kinetic energy (3.3x1030 erg) is also typical of the general population of CMEs. From photospheric magnetograms, we estimate the free energy (1.8x1031 erg) in the polar crown source region, which we find is sufficient to power the CME and the PEA. About 19% of the free energy went into the CME kinetic energy. We compute the thermal energy content of the PEA (2.3x1029 erg) and find it to be a small fraction (6.8%) of the CME kinetic energy. This fraction is remarkably similar to that in active region CMEs associated with major flares. We also show that the 2012 March 12 is one among scores of polar CMEs observed during the maximum phase of cycle 24. The cycle 24 polar crown prominence eruptions have the same rate of association with CMEs as those from low-latitudes. This investigation supports the view that all CMEs are magnetically propelled from closed field regions, irrespective of their location on the Sun (polar crown filament regions, quiescent filament regions or active regions).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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