The Alfven-Falthammar formula for the parallel E-field and its analogue in downward auroral-current regions

被引：24

作者：

Jasperse, JR ^{[1
]}

Grossbard, NJ

机构：

[1] USAF, Res Lab, Space Vehicles Directorate, Hanscom AFB, MA 01731 USA

[2] Boston Coll, Inst Sci Res, Chestnut Hill, MA 02467 USA

来源：

IEEE TRANSACTIONS ON PLASMA SCIENCE | 2000年 / 28卷 / 06期

关键词：

Alfven-Falthammar formula; Birkeland current system; parallel E-fields in space plasmas;

D O I：

10.1109/27.902216

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

In this paper, we give an alternative derivation of the Alfven-Falthammar formula for a positive parallel E-field in upward auroral-current regions and its analogue for a negative parallel E-field in downward auroral-current regions. These formulas give nerv insight into the physics of the Birkeland current system. We find that for downward auroral-current regions, the velocity-space anisotropy in the ion distribution function is such that half the ion energy perpendicular to the magnetic field is greater than the ion energy parallel to the magnetic field. This is just opposite to the case for up ward auroral-current regions, These results are compared to recent particle-in-cell simulations and FREJA satellite data.

引用

页码：1874 / 1886

页数：13

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