影响上升调EMIC波激发的因素研究
摘要
卫星观测发现部分电磁离子回旋(EMIC)波具有上升调结构。相对于普通的EMIC波而言,上升调EMIC的激发条件更为苛刻。对影响上升调EMIC波的因素进行研究,有助于了解内磁层的演化过程。本文基于RBSP-B卫星的观测数据,使用非线性波增长理论研究影响上升调EMIC波激发的因素。研究发现,热质子的浓度增大或浓度占比增大更有利于上升调EMIC波的激发;热质子的温度各向异性增大,增加了氦带和氢带上升调EMIC波在低频侧激发的难度;低地磁纬度地区更容易激发出上升调EMIC波。
引文
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[2]Mursula K,Br?ysy T,Niskala K,et al.Pc1 pearls revisited:Structured electromagnetic ion cyclotron waves on Polar satellite and on ground[J].Journal of Geophysical Research Space Physics,2001,106(A12)29543-29553.
[3]Arnoldy R L,Engebretson M J,Denton R E,et al Pc 1 waves and associated unstable distributions of magnetospheric protons observed during a solar wind pressure pulse[J].Journal of Geophysical Research Space Physics,2005,110(A7):389-413.
[4]Engebretson M J,Keiling A,Fornacon K H,et al Cluster observations of Pc 1-2 waves and associated ion distributions during the October and November 2003magnetic storms[J].Planetary Space Science,200755(6):829-848.
[5]Grison B,Darrouzet F,Santolík O,et al.Cluster observations of reflected EMIC triggered emission REFLECTED EMIC TRIGGERED EMISSION[J]Geophysical Research Letters,2016,43(9):4164-4171.
[6]Pickett J S,Grison B,Omura Y,et al.Cluster observations of EMIC triggered emissions in association with Pc1 waves nea r Ea r th"s plasmapause[J]Geophysical Research Letters,2010,37:L09104.
[7]Omura Y,Pickett J,Grison B,et al.Theory and observation of electromagnetic ion cyclotron triggered emissions in the magnetosphere[J].Journal of Geophysical Research:Space Physics,2010,115(A7)A07234.