Global simulation of EMIC wave excitation during the 21 April 2001 storm from coupled RCM‐RAM‐HOTRAY modeling
Global simulation of EMIC wave excitation during the 21 April 2001 storm from coupled RCM‐RAM‐HOTRAY modeling
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DOI：
10.1029/2009ja015075
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发表时间：
2010-07
影响因子：
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通讯作者：
Lunjin Chen;R. Thorne;V. Jordanova;Chih‐Ping Wang;M. Gkioulidou;L. Lyons;R. Horne
中科院分区：
文献类型：
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作者：
Lunjin Chen;R. Thorne;V. Jordanova;Chih‐Ping Wang;M. Gkioulidou;L. Lyons;R. Horne
利用三种不同的程序组合：莱斯对流模式、环流-大气相互作用模式和HOTRAY射线追踪模式(结合增长率求解器)，模拟了2001年4月21日风暴He+波段电磁离子回旋(EMIC)波的全球分布和谱特性。在风暴主相期间，注入离子呈现非麦克斯韦分布，在几keV附近有明显的相空间密度极小值。从等离子体片注入的环电流H+为风暴期间的EMIC激发提供了自由能源。显著的波动增益被限制在风暴时间羽流内的一个有限的空间区域内，并在黄昏和午夜前羽流的东缘达到最大值。激发波也能共振和散射相对论电子，但最小电子共振能量一般在3 MeV以上。
The global distribution and spectral properties of electromagnetic ion cyclotron (EMIC) waves in the He+ band are simulated for the 21 April 2001 storm using a combination of three different codes: the Rice Convection Model, the Ring current-Atmospheric interactions Model, and the HOTRAY ray tracing code (incorporated with growth rate solver). During the storm main phase, injected ions exhibit a non-Maxwellian distribution with pronounced phase space density minima at energies around a few keV. Ring current H+-injected from the plasma sheet provides the source of free energy for EMIC excitation during the storm. Significant wave gain is confined to a limited spatial region inside the storm time plume and maximizes at the eastward edge of the plume in the dusk and premidnight sector. The excited waves are also able to resonate and scatter relativistic electrons, but the minimum electron resonant energy is generally above 3 MeV.