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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >SolarWind Plasma Parameter Variability Across Solar Cycles 23 and 24: From Turbulence to Extremes
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SolarWind Plasma Parameter Variability Across Solar Cycles 23 and 24: From Turbulence to Extremes

机译：SolarWind等离子体参数变化太阳周期23和24:从动荡极端

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摘要

Solar wind variability spans a wide range of amplitudes and timescales, from turbulent fluctuations to the 11 year solar cycle. We apply the data quantile-quantile (DQQ) method to NASA/Wind observations spanning solar cycles 23 and 24, to study how the uniqueness of each cycle maximum and minimum manifests in the changing statistical distribution of plasma parameters in fast and slow solar wind. The DQQ method allows us to discriminate between two distinct components of the distribution: the core region simply tracks the solar cycle in its moments but shows little sensitivity to solar wind state or the specific activity of each cycle. This would be consistent with an underlying in situ process such as turbulence driving the evolution of fluctuations up to an outer scale. In contrast, the tail component of the distribution is sensitive both to the differences between the maxima and minima of cycles 23 and 24, and the fast or slow state of the solar wind. The tail component varies over the solar cycle in such a way as to maintain a constant functional form, with only its moments varying with solar activity. Finally, after isolating the core region of the distribution, we test its lognormality over the solar cycle in each solar wind state and find the lognormal provides a more robust description of the statistics in slow wind than fast; however, in both states the goodness of fit is significantly reduced at solar maximum.
机译：太阳风可变性跨越广泛的振幅和时间尺度,从动荡11年的太阳周期波动。数据quantile-quantile (DQQ)方法美国航天局/风观测生成太阳周期2324,每个周期研究的独特性最大和最小变化的体现等离子体参数的统计分布快和慢的太阳风。我们区分两种截然不同的组件的地理分布:核心区域但简单地跟踪太阳活动周期的时刻显示了太阳风状态或灵敏度每个周期的特定活动。与一个潜在的原位过程保持一致如湍流驾驶的进化外部规模波动。的尾巴分量分布敏感的之间的差异最大值和最小值的周期23和24日快或慢的太阳风。组件在太阳活动周期的变化保持一个常数的函数形式,只有与太阳能的时刻不同活动。区域的分布,我们测试它在每个太阳能对数常态的太阳活动周期风状态,发现对数正态提供了更多在缓慢的风力强劲的描述统计比快;配合在太阳能最大显著降低。

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