The role of ring current particle injections: Global simulations and Van Allen Probes observations during 17 March 2013 storm

被引：37
作者：
Yu, Yiqun [1 ]
Jordanova, Vania [1 ]
Welling, Dan [2 ]
Larsen, Brian [1 ]
Claudepierre, Seth G. [3 ]
Kletzing, Craig [4 ]
机构：
[1] Los Alamos Natl Lab, Los Alamos, NM 87545 USA
[2] Univ Michigan, Dept Atmospher Ocean & Space Sci, Ann Arbor, MI 48109 USA
[3] Aerosp Corp, Los Angeles, CA 90009 USA
[4] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA
来源：
GEOPHYSICAL RESEARCH LETTERS | 2014年 / 41卷 / 04期
基金：
美国国家科学基金会;
关键词：
substorm injections; self-consistent treatment of fields and plasma; van allen probes; ring current dynamics; MODEL; ELECTRONS;
D O I：
10.1002/2014GL059322
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
We simulate substorm injections observed by the Van Allen Probes during the 17 March 2013 storm using a self-consistent coupling between the ring current model RAM-SCB and the global MHD model BATS-R-US. This is a significant advancement compared to previous studies that used artificially imposed electromagnetic field pulses to mimic substorm dipolarization and associated inductive electric field. Several substorm dipolarizations and injections are reproduced in the MHD model, in agreement with the timing of shape changes in the AE/AL index. The associated inductive electric field transports plasma sheet plasma to geostationary altitudes, providing the boundary plasma source to the ring current model. It is found that impulsive plasma sheet injections, together with a large-scale convection electric field, are necessary to develop a strong ring current. Comparisons with Van Allen Probes observations show that our model reasonably well captures dispersed electron injections and the global Dst index. Key Points <list list-type="bulleted"> <list-item id="grl51406-li-0001">New capability for studying substorm-associated depolarization and injections <list-item id="grl51406-li-0002">Advanced from previous technique that used artificial electromagnetic pulses <list-item id="grl51406-li-0003">The model well produces injections and electron fluxes observed from Van Allen Probes
引用
收藏
页码：1126 / 1132
页数：7
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