The turbulent Alfvenic aurora

被引：102

作者：

Chaston, C. C. ^{[1
]}

Salem, C. ^{[1
]}

Bonnell, J. W. ^{[1
]}

Carlson, C. W. ^{[1
]}

Ergun, R. E. ^{[2
]}

Strangeway, R. J. ^{[3
]}

McFadden, J. P. ^{[1
]}

机构：

[1] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA

[2] Univ Colorado, Atmospher & Space Phys Lab, Boulder, CO 80303 USA

[3] Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 17期

关键词：

D O I：

10.1103/PhysRevLett.100.175003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

It is demonstrated from observations that the Alfvenic aurora may be powered by a turbulent cascade transverse to the geomagnetic field from large MHD scales to small Alfven wave scales of several electron skin depths and less. We show that the energy transport through the cascade is sufficient to drive the observed acceleration of electrons from near-Earth space to form the aurora. We find that regions of Alfven wave dissipation, and particle acceleration, are localized or intermittent and embedded within a near-homogeneous background of large-scale MHD structures.

引用

页数：4

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