S3‐2 measurements of the polar cap potential
S3‐2 measurements of the polar cap potential
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DOI：
10.1029/ja088ia11p09125
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发表时间：
1983-11
影响因子：
--
通讯作者：
M. A. Doyle;W. J. Burke
中科院分区：
文献类型：
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作者：
M. A. Doyle;W. J. Burke
1976 年 8 月至 12 月期间，S3-2 卫星总共 83 次黎明-黄昏高纬度经过进行了分析，以确定跨极帽电势 Φpc 与各种太阳风-行星际磁场参数之间的相关性。 68 次通过时可获得行星际磁场分量的每小时和 15 秒平均值以及太阳风速度的每小时平均值。在所研究的 41 (27) 个案例中，行星际磁场具有向南（向北）的分量。测量到的电势范围从亚暴期间的 170 kV 到两个向北行星际磁场期间的 12 kV。对数据进行最小二乘拟合，以确定极帽电势对源自重联理论和其他传统相关太阳风-行星际磁场参数的四种不同电场模型的依赖性。在每种情况下，都存在 40 kV 量级的残余极帽电势。这表明当行星际磁场向北转向和/或除重新连接之外的过程对极帽电势有贡献时，电势弛豫存在时间延迟。总行星际磁场方差和太阳风速作为数据过滤器进行了测试，发现具有一定的意义。讨论了与基于大气探测器和 S3-3 卫星测量的类似研究的比较。
A total of 83 dawn-dusk, high-latitude passes of the S3-2 satellite has been analyzed for the period August through December 1976 to determine correlations between the cross polar cap potential Φpc and various solar wind-interplanetary magnetic field parameters. Hourly and 15-s averaged values of the interplanetary magnetic field components and hourly averaged values of the solar wind velocity were available for 68 of the passes. In 41 (27) of the cases studied, the interplanetary magnetic field had a southward (northward) component. Measured potentials ranged from 170 kV during a substorm to 12 kV during two periods of northward interplanetary magnetic field. Least squares fits to the data were performed in order to determine the dependence of the polar cap potential on four different electric field models derived from reconnection theory and other traditionally correlated solar wind-interplanetary magnetic field parameters. In each case, there is a residual polar cap potential of the order of 40 kV. This suggests a time delay in the relaxation of the potential when the interplanetary magnetic field turns northward and/or processes other than reconnection contribute to the polar cap potential. Total interplanetary magnetic field variance and solar wind speed were tested as filters on the data and found to have some significance. Comparisons with similar studies based on measurements from the Atmosphere Explorer and S3-3 satellites are discussed.