Physical Parameters of Solar X-Ray Jets
Physical Parameters of Solar X-Ray Jets
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DOI：
10.1086/317024
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发表时间：
2000-10
期刊：
影响因子：
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通讯作者：
M. Shimojo;K. Shibata
中科院分区：
文献类型：
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作者：
M. Shimojo;K. Shibata
我们利用Yohkoh软X射线望远镜获得的高分辨率数据，导出了X射线喷流和耀斑的物理参数。我们分析了16个X射线喷流，发现喷流和足点耀斑具有以下性质：（1）喷流的温度和密度分别为3-8 MK（平均值：5.6 MK）和0.7-4.0 × 109 cm-3（平均值：1.7 × 109 cm ~（-3），（2）喷流的温度与足点耀斑相似，（3）喷流的热能为1027-1029尔格，（4）喷流的表观速度通常低于声速;（5）喷流的温度与足点耀斑的大小（面积的平方根）之间存在相关性。在这些结果的基础上，我们发现，喷流和足点耀斑的温度是由热通量和传导通量之间的平衡，喷流的质量是可比的理论值的基础上的平衡之间的传导通量和焓通量的蒸发流进行。这些结果表明，X射线喷流是由重联加热产生的蒸发流。
We derived the physical parameters of X-ray jets and associated flares using the high-resolution data taken with the soft X-ray telescope aboard Yohkoh. We analyzed 16 X-ray jets and found the following properties of the jets and the footpoint flares: (1) the temperatures and density of the jets, respectively, are 3-8 MK (average: 5.6 MK) and 0.7-4.0 × 109 cm-3 (average: 1.7 × 109 cm-3), (2) the temperatures of the jets are similar to those of the footpoint flares, (3) the thermal energies of the jets are 1027-1029 ergs, which is to of those of the footpoint flares, (4) the apparent velocity of the jets is usually slower than the sound speed, and (5) there is a correlation between the temperatures of the jets and the sizes (square root of area) of the footpoint flares. On the basis of these results, we find that the temperatures of a jet and a footpoint flare are determined by the balance between heating flux and conductive flux and that the mass of a jet is comparable to the theoretical value based on the balance between conductive flux and enthalpy flux carried by the evaporation flow. These results suggest that X-ray jets are evaporation flows produced by the reconnection heating.