Extreme bursts in the solar wind
Extreme bursts in the solar wind
复制标题
太阳风的极端爆发
DOI：
10.1029/2011gl048245
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发表时间：
2011
影响因子：
5.2
通讯作者：
J. Davidsen
中科院分区：
文献类型：
--
作者：
N. Moloney;J. Davidsen
对太阳活动和太阳风爆发进行统计定性和预测，是空间气象物理学中一个具有重大实际意义的问题。在这里，我们表明，许多明显的定性和定量差异，在太阳活动和太阳风变化之间的爆发统计在太阳极大期可以解决考虑极端爆发。这些被定义为在高阈值范围内的峰值过阈值事件，其数量按幂律衰减。我们发现，极端爆发的持续时间和能量分布的太阳风ε参数都是阈值无关的。然而，极端爆发之间的时间分布明显取决于阈值。我们的研究结果表明，太阳活动的特征出现在太阳风的极端爆发中，而其他特征则可能受局部等离子体湍流的影响。
The statistical characterization and prediction of bursts in solar activity and in the solar wind is a problem of great practical relevance in space weather physics. Here, we show that many of the apparent qualitative and quantitative differences in burst statistics between solar activity and solar wind variation during solar maximum can be resolved by considering extreme bursts. These are defined as peak‐over‐threshold events over the range of high thresholds for which their number decays as a power law. We find that the duration time and energy distributions of extreme bursts in the solar wind ε parameter are both threshold‐independent. The distribution of times between extreme bursts in epsilon, however, depends markedly on threshold. Our results indicate that a signature of the solar activity appears in extreme bursts of the solar wind, while other features are likely governed by local plasma turbulence.