TEMPERATURE EVOLUTION OF A MAGNETIC FLUX ROPE IN A FAILED SOLAR ERUPTION
TEMPERATURE EVOLUTION OF A MAGNETIC FLUX ROPE IN A FAILED SOLAR ERUPTION
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DOI：
10.1088/0004-637x/784/1/48
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发表时间：
2014-02
期刊：
影响因子：
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通讯作者：
H. Song;J. Zhang;X. Cheng;Y. Chen;R. Liu;Y. -. Wang;B. Li
中科院分区：
文献类型：
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作者：
H. Song;J. Zhang;X. Cheng;Y. Chen;R. Liu;Y. -. Wang;B. Li
本文首次报道了一次失败的太阳喷发中磁通绳的详细温度演化过程。在2013年1月5日，通量绳在第一分钟内被脉冲加速到400km s - 1的速度，然后在两分钟内减速并完全停止。失败的喷发导致了一个巨大的高空（地表以上约100毫米）高温“火球”在日冕中停留了两个多小时。通过差分发射测量分析技术，利用太阳动力观测台大气成像组件的观测数据生成温度图，揭示了通量绳热结构的时间演变。在演化的前9分钟内，通量绳的平均温度从~ 5 MK稳步上升到~ 10 MK，这比伴随的软x射线耀斑的上升时间（约3分钟）长得多。与低洼耀斑环的加热主要由色球等离子体蒸发产生不同，通量绳的加热是由持续磁重联释放的能量产生的。在试图喷发的过程中，覆盖在通量绳上的环形拱廊被推高了约10毫米。环形拱廊的速度变化规律表明，这次喷发的失败是由上覆环形拱廊的捆绑作用造成的。
In this paper, we report for the first time the detailed temperature evolution process of the magnetic flux rope in a failed solar eruption. Occurring on 2013 January 05, the flux rope was impulsively accelerated to a speed of ∼400 km s−1 in the first minute, then decelerated and came to a complete stop in two minutes. The failed eruption resulted in a large-size high-lying (∼100 Mm above the surface), high-temperature “fire ball” sitting in the corona for more than two hours. The time evolution of the thermal structure of the flux rope was revealed through the differential emission measure analysis technique, which produced temperature maps using observations of the Atmospheric Imaging Assembly on board the Solar Dynamic Observatory. The average temperature of the flux rope steadily increased from ∼5 MK to ∼10 MK during the first nine minutes of the evolution, which was much longer than the rise time (about three minutes) of the associated soft X-ray flare. We suggest that the flux rope is heated by the energy release of the continuing magnetic reconnection, different from the heating of the low-lying flare loops, which is mainly produced by the chromospheric plasma evaporation. The loop arcade overlying the flux rope was pushed up by ∼10 Mm during the attempted eruption. The pattern of the velocity variation of the loop arcade strongly suggests that the failure of the eruption was caused by the strapping effect of the overlying loop arcade.