Source location of falling tone chorus
Source location of falling tone chorus
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DOI：
10.1029/2012gl053929
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发表时间：
2012-11
影响因子：
5.2
通讯作者：
S. Kurita;H. Misawa;C. Cully;O. Le Contel;V. Angelopoulos
中科院分区：
文献类型：
--
作者：
S. Kurita;H. Misawa;C. Cully;O. Le Contel;V. Angelopoulos
合唱的特点是它的精细结构，由上升或下降的音调组成，被认为是由非线性波粒相互作用引起的。然而，以往的研究表明，升调和降调合唱的强度和传播特性有很大的不同，这表明他们的产生过程可能是不同的。本文基于THEMIS的坡印廷矢量测量，对降调合唱的传播方向进行统计分析，以确定其声源区域。结果表明，降调合唱在北方和南半球都是以与升调合唱相同的方式从磁赤道向高纬度传播。结果表明，磁赤道是升调合唱和降调合唱的共同声源位置。研究结果强调，升、降调合唱的不同性质源于它们的生成机制，而不是源于它们的源区。
Chorus is characterized by its fine structures consisting of rising or falling tones believed to result from nonlinear wave‐particle interactions. However, previous studies have showed that the intensity and propagation characteristics of rising and falling tone chorus are quite different, suggesting that their generation processes might be different. In this paper, the propagation direction of falling tone chorus is statistically investigated to identify its source region based on the Poynting vector measurement with THEMIS. The result shows that the falling tone chorus propagates from the magnetic equator to higher latitude both in the northern and southern hemispheres, in the same way as rising tone chorus. Our result shows that the magnetic equator is the common source location for both rising and falling tone chorus. The result emphasizes that the different properties between rising and falling tone chorus originate from their generation mechanism rather than source region.