Precipitation of radiation belt electrons by EMIC waves, observed from ground and space
Precipitation of radiation belt electrons by EMIC waves, observed from ground and space
复制标题
DOI：
10.1029/2008gl035727
复制
发表时间：
2008-12-05
影响因子：
5.2
通讯作者：
Jordanova, V.
中科院分区：
文献类型：
--
作者：
Miyoshi, Y.;Sakaguchi, K.;Jordanova, V.
我们的证据表明，左手极化电磁离子回旋（EMIC）等离子体波可以导致相对论电子进入大气中的损失。我们独特的一套地面和卫星观测表明，一致沉淀的离子与能量的几十千电子伏和相对论电子到一个孤立的质子极光。在等离子体层顶附近，波粒相互作用与EMIC波产生了一致降水。俯仰角扩散系数的估计支持所观察到的EMIC波引起的离子和相对论电子的一致沉淀。这项研究澄清了具有数十keV能量的离子通过与EMIC波的回旋共振影响辐射带中相对论电子的演化，这种效应在20世纪70年代初首次被理论预测。
We show evidence that left-hand polarised electromagnetic ion cyclotron (EMIC) plasma waves can cause the loss of relativistic electrons into the atmosphere. Our unique set of ground and satellite observations shows coincident precipitation of ions with energies of tens of keV and of relativistic electrons into an isolated proton aurora. The coincident precipitation was produced by wave-particle interactions with EMIC waves near the plasmapause. The estimation of pitch angle diffusion coefficients supports that the observed EMIC waves caused coincident precipitation of both ions and relativistic electrons. This study clarifies that ions with energies of tens of keV affect the evolution of relativistic electrons in the radiation belts via cyclotron resonance with EMIC waves, an effect that was first theoretically predicted in the early 1970's.