Propagation of lower‐band whistler‐mode waves in the outer Van Allen belt: Systematic analysis of 11 years of multi‐component data from the Cluster spacecraft
Propagation of lower‐band whistler‐mode waves in the outer Van Allen belt: Systematic analysis of 11 years of multi‐component data from the Cluster spacecraft
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DOI：
10.1002/2014gl059815
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发表时间：
2014-04
影响因子：
5.2
通讯作者：
O. Santolík;E. Macusova;I. Kolmašová;N. Cornilleau-Wehrlin;Y. Conchy
中科院分区：
文献类型：
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作者：
O. Santolík;E. Macusova;I. Kolmašová;N. Cornilleau-Wehrlin;Y. Conchy
低波段哨声模式的辐射可以影响外货车艾伦辐射带的动力学。我们使用四个集群航天器上的STAFF‐SA仪器的11年测量数据，系统地构建了波传播参数随位置变化的地图。我们确定的概率分布的波矢角加权波强度。结果表明，强波的波矢方向接近于以局部磁力线为中心的高斯型峰值。这个峰的宽度在10度到20度之间。斜波的累积百分比低于10- 15%。这一结果对于高纬度地区低波段合唱的哨声模式发射的重要类别特别重要，远远超出了它们的源区域，在那里简单的射线追踪模型失败，需要另一种机制来保持波矢量接近场对准方向。
Lower‐band whistler‐mode emissions can influence the dynamics of the outer Van Allen radiation belts. We use 11 years of measurements of the STAFF‐SA instruments onboard the four Cluster spacecraft to systematically build maps of wave propagation parameters as a function of position. We determine probability distributions of wave vector angle weighted by the wave intensity. The results show that wave vector directions of intense waves are close to a Gaussian‐shaped peak centered on the local magnetic field line. The width of this peak is between 10 and 20 degrees. The cumulative percentage of oblique waves is below 10–15%. This result is especially significant for an important class of whistler‐mode emissions of lower‐band chorus at higher latitudes, well outside their source region, where a simple ray tracing model fails and another mechanism is necessary to keep the wave vectors close to the field‐aligned direction.