Excitation of EMIC waves detected by the Van Allen Probes on 28 April 2013

被引：64

作者：

Zhang, J. -C. ^{[1
]}

Saikin, A. A. ^{[1
]}

Kistler, L. M. ^{[1
]}

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

Spence, H. E. ^{[1
]}

Mouikis, C. G. ^{[1
]}

Torbert, R. B. ^{[1
]}

Larsen, B. A. ^{[2
]}

Reeves, G. D. ^{[2
]}

Skoug, R. M. ^{[2
]}

Funsten, H. O. ^{[2
]}

Kurth, W. S. ^{[3
]}

Kletzing, C. A. ^{[3
]}

Allen, R. C. ^{[4
,5
]}

Jordanova, V. K. ^{[2
]}

机构：

[1] Univ New Hampshire, Ctr Space Sci, Durham, NH 03824 USA

[2] Los Alamos Natl Lab, Los Alamos, NM USA

[3] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA

[4] Univ Texas San Antonio, Dept Phys & Astron, San Antonio, TX USA

[5] SW Res Inst, Space Sci & Engn Div, San Antonio, TX USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2014年 / 41卷 / 12期

基金：

美国能源部;

关键词：

ION-CYCLOTRON WAVES; RING CURRENT; PARTICLE INTERACTIONS; INNER MAGNETOSPHERE; OMEGA-HE; CLUSTER; DISTRIBUTIONS; GENERATION; GEOS-1; PLASMA;

D O I：

10.1002/2014GL060621

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We report the wave observations, associated plasma measurements, and linear theory testing of electromagnetic ion cyclotron (EMIC) wave events observed by the Van Allen Probes on 28 April 2013. The wave events are detected in their generation regions as three individual events in two consecutive orbits of Van Allen Probe-A, while the other spacecraft, B, does not detect any significant EMIC wave activity during this period. Three overlapping H+ populations are observed around the plasmapause when the waves are excited. The difference between the observational EMIC wave growth parameter (Sigma(h)) and the theoretical EMIC instability parameter (S-h) is significantly raised, on average, to 0.10 +/- 0.01, 0.15 +/- 0.02, and 0.07 +/- 0.02 during the three wave events, respectively. On Van Allen Probe-B, this difference never exceeds 0. Compared to linear theory (Sigma(h)>S-h), the waves are only excited for elevated thresholds.

引用

页码：4101 / 4108

页数：8

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