Propagation of Chorus Waves Generated in Minimum‐B Pockets
Propagation of Chorus Waves Generated in Minimum‐B Pockets
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DOI：
10.1029/2021gl096478
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发表时间：
2021-12
影响因子：
5.2
通讯作者：
N. Kang;J. Bortnik;X. An;S. Claudepierre
中科院分区：
文献类型：
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作者：
N. Kang;J. Bortnik;X. An;S. Claudepierre
我们给出了在最小B腔中产生的合唱波的第一个射线跟踪结果。为了适应任意的磁场模型，我们发展了一种新的射线追踪器，它使我们能够使用Tsyganenko(1989)模型来构造最小B口袋几何。在不同的地磁活动和热电子密度条件下，从Minimum-B腔发射不同频率和初始波法向角的射线，并对其进行追踪。我们的结果表明，从最小B腔产生的合唱波通常是高度局域化的，因此不太可能被探测到，除非航天器非常接近震源区域。这些波也不太可能传播到等离子体层。传播距离一般随着地磁活动的增加而减小。
We present the first ray tracing results of chorus waves generated in minimum‐B pockets. A new ray tracer is developed to accommodate an arbitrary magnetic field model, which enables us to construct minimum‐B pocket geometries using the Tsyganenko (1989) model. Rays with different frequencies and initial wave normal angles are launched from minimum‐B pockets and traced under different geomagnetic activity and hot electron density conditions. Our results indicate that chorus waves generated from minimum‐B pockets are usually highly localized and thus are unlikely to be detected unless the spacecraft is very close to the source region. These waves are also very unlikely to propagate into the plasmasphere. The propagation distances generally decrease with increasing geomagnetic activity.