EMIC waves and plasmaspheric and plume density: CRRES results

被引:41
作者
Halford, A. J. [1 ]
Fraser, B. J. [1 ]
Morley, S. K. [2 ]
机构
[1] Univ Newcastle, Ctr Space Phys, Callaghan, NSW 2308, Australia
[2] Los Alamos Natl Lab, Space Sci & Applicat ISR 1, Los Alamos, NM 87545 USA
基金
澳大利亚研究理事会; 芬兰科学院;
关键词
EMIC waves; plasmasphere; geomagnetic storms; plasmaspheric plumes; ION-CYCLOTRON WAVES; MAGNETOSPHERIC MAGNETIC-FIELD; ELECTRON-RADIATION BELT; GEOMAGNETIC STORMS; PARTICLE INTERACTIONS; STATISTICAL-ANALYSIS; SOURCE REGION; RING CURRENT; OMEGA-HE; PLASMA;
D O I
10.1002/2014JA020338
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Electromagnetic ion cyclotron (EMIC) waves frequently occur during geomagnetic storms, specifically during the main phase and 3-6 days following the minimum Sym - H value. EMIC waves contribute to the loss of ring current ions and radiation belt MeV electrons. Recent studies have suggested that cold plasma density structures found inside the plasmasphere and plasmaspheric plumes are important for the generation and propagation of EMIC waves. During the CRRES mission, 913 EMIC wave events and 124 geomagnetic storms were identified. In this study we compare the quiet time cold plasma density to the cold plasma density measured during EMIC wave events across different geomagnetic conditions. We found statistically that EMIC waves occurred in regions of enhanced densities. EMIC waves were, on average, not associated with large local negative density gradients.
引用
收藏
页码:1974 / 1992
页数:19
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