Power laws in solar flares: Self-organized criticality or turbulence?
Power laws in solar flares: Self-organized criticality or turbulence?
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DOI：
10.1103/physrevlett.83.4662
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发表时间：
1999-11-29
影响因子：
8.6
通讯作者：
Vulpiani, A
中科院分区：
文献类型：
--
作者：
Boffetta, G;Carbone, V;Vulpiani, A
使用20年的数据对太阳野兔活动连续爆发之间的静止时间τ（L）进行统计，显示出指数α接近或等于2.4的幂律分布。这是一个潜在的复杂动态与长期相关的迹象。观测到的标度行为与预测泊松统计的太阳耀斑自组织临界模型相矛盾。混沌模型，包括不稳定的层流阶段和随后的重新稳定线索的非线性动力学，能够再现幂律的静止时间。随钻测量湍流的壳模型正确地再现了所有观察到的分布。
The statistics of quiescent times tau(L) between successive bursts of solar hares activity, performed using 20 years of data, displays a power law distribution with exponent alpha similar or equal to 2.4. This is an indication of an underlying complex dynamics with long correlation rimes. The observed scaling behavior is in contradiction with the self-organized criticality models of solar flares which predict Poisson-like statistics. Chaotic models, including the destabilization of the laminar phases and subsequent restabilization clue to nonlinear dynamics, are able to reproduce the power law for the quiescent times. A shell model of MWD turbulence correctly reproduces all the observed distributions.