The State of Self-organized Criticality of the Sun During the Last Three Solar Cycles. I. Observations
The State of Self-organized Criticality of the Sun During the Last Three Solar Cycles. I. Observations
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DOI：
10.1007/s11207-011-9755-0
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发表时间：
2010-06
期刊：
影响因子：
2.8
通讯作者：
M. Aschwanden
中科院分区：
文献类型：
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作者：
M. Aschwanden
利用HXRBS/SMM、BATSE/CGRO和RHESSI的硬X射线数据，分析了最近三个太阳周期（1980--2010年）太阳耀斑的峰值通量、总通量和持续时间的发生频率分布。从合成数据中，我们发现幂律斜率，其平均值为峰值通量、总通量和耀斑持续时间。我们发现峰值通量的幂律斜率作为太阳周期的函数存在系统反相关性，随着近似正弦变化而变化，太阳周期周期和周期最小时间的平均值、变化。在太阳周期的最大值期间，幂律斜率最平坦，这表明日冕的磁性复杂性较高，导致强烈耀斑的发生率过高。
We analyze the occurrence frequency distributions of peak fluxes, total fluxes, and durationsof solar flares over the last three solar cycles (during 1980--2010) from hard X-ray data of HXRBS/SMM, BATSE/CGRO, and RHESSI. From the synthesized data we find powerlaw slopes with mean values offor the peak flux,for the total flux, andfor flare durations. We find a systematic anti-correlation of the powerlaw slope of peak fluxes as a function of the solar cycle, varying with an approximate sinusoidal variation, with a mean of, a variation of, a solar cycle periodyrs, and a cycle minimum time. The powerlaw slope is flattest during the maximum of a solar cycle, which indicates a higher magnetic complexity of the solar corona that leads to an overproportional rate of powerful flares.