OBSERVATION OF KINETIC ALFVEN WAVES BY THE FREJA SPACECRAFT

被引：265

作者：

LOUARN, P ^{[1
]}

WAHLUND, JE ^{[1
]}

CHUST, T ^{[1
]}

DEFERAUDY, H ^{[1
]}

ROUX, A ^{[1
]}

HOLBACK, B ^{[1
]}

DOVNER, PO ^{[1
]}

ERIKSSON, AI ^{[1
]}

HOLMGREN, G ^{[1
]}

机构：

[1] SWEDISH INST SPACE PHYS,UPPSALA DIV,S-75591 UPPSALA,SWEDEN

来源：

GEOPHYSICAL RESEARCH LETTERS | 1994年 / 21卷 / 17期

关键词：

D O I：

10.1029/94GL00882

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

It is shown that the low-frequency (from 1 to 20 Hz) auroral electromagnetic turbulence consists of two kinds of phenomena: (1) magnetic fluctuations due to quasi-static currents and (2) strong electric spikes (larger than 100 mV/m) with associated magnetic (30 nT) and density (dn/n greater-than-or-equal-to 30 %) fluctuations. These spikes are interpreted as kinetic Alfven waves. They have transverse scale of the order of the electron inertia length (1 km) and then, could dissipate via the generation of a parallel electric field by finite electron mass effects. Given their strong Poynting flux (10(-3) to 10(-2) W/m2), they likely significantly contribute to the auroral plasma energization.

引用

页码：1847 / 1850

页数：4

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