Magnetic Free Energy in NOAA Active Region 10486 on 2003 October 29
Magnetic Free Energy in NOAA Active Region 10486 on 2003 October 29
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DOI：
10.1086/429961
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发表时间：
2005-03
期刊：
影响因子：
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通讯作者：
T. Metcalf;K. Leka;D. Mickey
中科院分区：
文献类型：
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作者：
T. Metcalf;K. Leka;D. Mickey
利用Mees太阳天文台成像矢量磁象仪在Na I λ5896谱线上观测到的色球矢量磁图，计算了2003年10月29日太阳NOAA活动区10486的总磁能和自由磁能。根据磁场维里定理，利用20：39 UT发生的X10耀斑的观测数据推导出磁能。虽然大气视宁度差使我们无法辨别与耀斑相关的自由能变化，但NOAA AR 10486中有异常大量的自由磁能：（5.7 ± 1.9）× 1033尔格，这与在这个活动区域观察到的非常高的活动水平一致。因此，这种极端的活动似乎是由磁自由能驱动的。
We calculate the total and the free magnetic energy for solar NOAA active region 10486 on 2003 October 29 using chromospheric vector magnetograms observed with the Imaging Vector Magnetograph at Mees Solar Observatory in the Na I λ5896 spectral line. The magnetic energy is derived from the magnetic virial theorem using observations spanning the X10 flare that occurred at 20:39 UT. Although poor atmospheric seeing prevented us from discerning changes in the free energy associated with the flare, there was an unusually large amount of free magnetic energy in NOAA AR 10486: (5.7 ± 1.9) × 1033 ergs, which is consistent with the very high level of activity observed in this active region. It is thus plausible that the extreme activity was powered by the magnetic free energy.