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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Exploring the cross correlations and autocorrelations of the ULF indices and incorporating the ULF indices into the systems science of the solar wind-driven magnetosphere
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Exploring the cross correlations and autocorrelations of the ULF indices and incorporating the ULF indices into the systems science of the solar wind-driven magnetosphere

机译：交叉相关性和探索ULF指数和自我将ULF指数纳入系统科学的太阳能风力磁气圈

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摘要

The ULF magnetospheric indices S_(gr), S_(geo), T_(gr), and T_(geo) are examined and correlated with solar wind variables, geomagnetic indices, and the multispacecraft-averaged relativistic-electron flux F in the magnetosphere. The ULF indices are detrended by subtracting off sine waves with 24 h periods to form S_(grd), S_(geod), T_(grd), and T_(geod). The detrending improves correlations. Autocorrelation-function analysis indicates that there are still strong 24 h period nonsinusoidal signals in the indices which should be removed in future. Indications are that the ground-based indices S_(grd) and T_(grd) are more predictable than the geosynchronous indices S_(geod) and T_(geod). In the analysis, a difference index ΔS_(mag) ≈ S_(grd) - 0.693 S_(geod) is derived: the time integral of ΔS_(mag) has the highest ULF index correlation with the relativistic-electron flux F. In systems-science fashion, canonical correlation analysis (CCA) is used to correlate the relativistic-electron flux simultaneously with the time integrals of (a) the solar wind velocity, (b) the solar wind number density, (c) the level of geomagnetic activity, (d) the ULF indices, and (e) the type of solar wind plasma (coronal hole versus streamer belt): The time integrals of the solar wind density and the type of plasma have the highest correlations with F. To create a solar wind-Earth system of variables, the two indices S_(grd) and S_(geod) are combined with seven geomagnetic indices; from this, CCA produces a canonical Earth variable that is matched with a canonical solar wind variable. Very high correlations (r_(corr) = 0.926) between the two canonical variables are obtained.
机译：ULF磁性层的指数S_ (gr) S_ (geo),T_ (gr),识别和T_ (geo)是检测和识别相关与太阳风变量、地磁指数和multispacecraft-averaged相对论电子通量的F磁气圈。与24小时时间减去正弦波形式S_(研磨),S_(大地测量学)、T_(研磨),识别和T_(大地测量学)识别。消除趋势提高相关性。自相关函数分析表明仍然有强烈的24小时周期非正弦的信号的指数应该删除的未来。指数S_(研磨)和T_(研磨)识别更可预测比同步指数S_(大地测量学)和T_(大地测量学)识别。ΔS_ (mag)≈S_(研磨)- 0.693 S_(大地测量学)得到:的时间积分ΔS_ (mag) ULF最高指数与相对论电子相关通量f .以系统科学的方式,规范相关分析(CCA)是用于关联相对论电子通量同时的时间积分(a)太阳风太阳风速度,(b)数密度,(c)地磁活动水平,ULF (d)指数,(e)太阳风等离子体的类型(日冕洞与拖缆带):时间太阳能风能密度和类型的积分等离子体的相关性最高。要创建一个太阳能wind-Earth系统变量,这两个指数S_(研磨)和S_(大地测量学)的总和有七个地磁指数;产生一个正则变量太阳风与规范变量。非常高的相关性(r_ (corr) = 0.926)这两个规范变量。

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