The Most Intense Electron-Scale Current Sheets in the Solar Wind

被引：2
|
作者：
Podesta, John J. [1 ]
机构：
[1] Space Sci Inst, Ctr Space Plasma Phys, Boulder, CO 80301 USA
来源：
SOLAR PHYSICS | 2017年 / 292卷 / 04期
关键词：
Solar wind; Power-law spectra; Current sheets; DISSIPATION RANGE;
D O I：
10.1007/s11207-017-1087-2
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Previous analysis of magnetohydrodynamic-scale currents in high-speed solar wind near 1 AU suggests that the most intense current-carrying structures occur at electron scales and are characterized by average current densities on the order of 1 pA/cm(2). Here, this prediction is verified by examining the effects of the measurement bandwidth and/or measurement resolution on the analysis of synthetic solar wind signals. Assuming Taylor's hypothesis holds for the energetically dominant fluctuations at kinetic scales, the results show that when nu(c) >> nu(b), where nu(c) is the measurement bandwidth and nu(b) approximate to 1/3 Hz is the break frequency, the average scale of the most intense fluctuations in the current density proxy is approximately 1/nu(c), and the average peak current density is a weakly increasing function that scales approximately like nu(0.1)(c).
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页数：16
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