The nonlinear response of the polar cap potential under southward IMF: A statistical view
The nonlinear response of the polar cap potential under southward IMF: A statistical view
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DOI：
10.1029/2011ja016924
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发表时间：
2011-12
影响因子：
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通讯作者：
F. Wilder;C. Clauer;J. Baker;E. Cousins;M. Hairston
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文献类型：
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作者：
F. Wilder;C. Clauer;J. Baker;E. Cousins;M. Hairston
[1] 我们报告了在 IMF 强烈南移期间太阳风特性对极帽电位 (CPCP) 饱和度影响的调查结果。我们使用传播的太阳风数据来搜索 1998 年至 2007 年期间行星际电场稳定超过 50 分钟的时期，并对 SuperDARN 和 DMSP 速度数据的可用性设置了进一步的条件。根据这些数据集计算 CPCP 值，并比较极帽电位与行星际电场 (IEF) 的各种拟合。结果发现，趋势是非线性的，平方根函数比直线拟合得更好，并且 CPCP 似乎没有表现出渐近行为。然后将 CPCP 的非线性与各种行星际参数相关联，以测试极冠电位饱和的各种模型。还发现CPCP与线性拟合的偏差与太阳风阿尔芬尼马赫数具有统计显着相关性，而与太阳风动压没有显着相关性。
[1] We report the results of an investigation into the effect of solar wind properties on the saturation of the polar cap potential (CPCP) during periods of strongly southward IMF. We use propagated solar wind data to search for periods between 1998 and 2007 when the interplanetary electric field is stable for more than 50 min and placed further conditions on the availability of SuperDARN and DMSP velocity data. CPCP values are calculated from these data sets and various fits of the polar cap potential to the interplanetary electric field (IEF) are compared. It is found that the trend is nonlinear, with a square root function fitting better than a straight line, and that the CPCP does not appear to exhibit asymptotic behavior. The nonlinearity of the CPCP is then correlated with various interplanetary parameters to test the various models of polar cap potential saturation. It is also found that the deviation of the CPCP from a linear fit has statistically significant correlation with solar wind Alfvenic Mach number and no significant correlation with solar wind dynamic pressure.