Electrostatic turbulence and Debye-Scale structures associated with electron thermalization at collisionless shocks

被引:64
作者
Bale, SD
Hull, A
Larson, DE
Lin, RP
Muschietti, L
Kellogg, PJ
Goetz, K
Monson, SJ
机构
[1] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA
[2] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
[3] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA
关键词
instabilities; shock waves; turbulence;
D O I
10.1086/342609
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We analyze measurements of bipolar, Debye-scale electrostatic structures and turbulence measured in the transition region of the Earth's collisionless bow shock. In this region, the solar wind electron population is slowed and heated, and we show that this turbulence correlates well in amplitude with the measured electron temperature change. The observed bipolar structures are highly oblate and longitudinally polarized and may instantaneously carry up to 10% of the plasma energy psi = ephi/k(b)T(e) approximate to 0.1 before dissipating. The relationship between psi and the field-aligned scale size Delta(parallel to) of the Gaussian potential suggests that the bipolar structures are BGK trapped particle equilibria or electron hole modes. We suggest a generation scenario and a potential role in dissipation.
引用
收藏
页码:L25 / L28
页数:4
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