Energy Balance in the Flaring Solar Corona
Energy Balance in the Flaring Solar Corona
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DOI：
10.1086/321655
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发表时间：
2001-08
期刊：
影响因子：
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通讯作者：
M. Wheatland;Y. Litvinenko
中科院分区：
文献类型：
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作者：
M. Wheatland;Y. Litvinenko
仅假设耀斑从日冕源获得能量，并且耀斑是消耗该源的主要机制，则全球日冕响应时间（耀斑消除可用日冕能量的时间）约为9个月。本文提出了一个详细的太阳活动周期内日冕动态能量平衡模型，用以描述日冕中的磁自由能如何随系统能量供应的变化和耀斑速率的变化而变化。该模型预测，由于日冕响应时间，系统的耀斑速率和自由能都应该滞后于系统的驱动（详细模型给出了约11个月的滞后）。这种效应可以解释某些太阳活动指数之间的滞后现象。给出了一个具体例子来支持该模型。对1976-1999年太阳黑子月数和软X射线耀斑月数时间序列的分析表明，耀斑数滞后于太阳黑子数约6个月。
Assuming only that flares derive their energy from a coronal source and that flaring is the dominant mechanism for depleting that source, the global coronal response time (time for flares to remove available coronal energy) is about 9 months. A detailed model for dynamic energy balance in the solar corona over the solar cycle is presented to describe how the magnetic free energy in the solar corona varies in response to changes in the supply of energy to the system and to changes in the flaring rate. The model predicts that both the flaring rate and the free energy of the system should lag behind the driving of the system because of the coronal response time (the detailed model gives a lag of ~11 months). This effect may account for hysteresis phenomena between certain solar activity indices. A specific example is presented in support of the model. Analysis of time series of monthly sunspot numbers and monthly numbers of soft X-ray flares over the years 1976-1999 indicates a tendency for flare numbers to lag behind sunspot numbers by ~6 months.