Parameter spaces for linear and nonlinear whistler-mode waves
Parameter spaces for linear and nonlinear whistler-mode waves
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DOI：
10.1063/1.4816022
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发表时间：
2013-07
影响因子：
2.2
通讯作者：
D. Summers;R. Tang;Y. Omura;Dong‐Hun Lee
中科院分区：
文献类型：
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作者：
D. Summers;R. Tang;Y. Omura;Dong‐Hun Lee
我们研究了磁层哨声模式波的增长，其中包括线性增长阶段和随后的非线性增长阶段。我们构建了在线性和非线性波增长之间的过渡处平滑匹配的波振幅的时间剖面。这种匹配过程只能发生在 (Nh/N0,AT) 空间中有限的“匹配区域”，其中 AT 是电子热各向异性，Nh 是热（高能）电子数密度，N0 是冷（背景）电子数密度。我们构建这个匹配区域并确定匹配波振幅在整个区域中如何变化。此外，我们在 (Nh/N0,AT) 空间中指定一个边界，该边界将只能发生线性合唱波生长的区域与可能发生完全非线性合唱波生长的区域分开。我们期望该边界在执行计算成本昂贵的全尺寸粒子模拟以及解释实验波数据中具有实际用途。
We examine the growth of magnetospheric whistler-mode waves which comprises a linear growth phase followed by a nonlinear growth phase. We construct time-profiles for the wave amplitude that smoothly match at the transition between linear and nonlinear wave growth. This matching procedure can only take place over a limited “matching region” in (Nh/N0,AT)-space, where AT is the electron thermal anisotropy, Nh is the hot (energetic) electron number density, and N0 is the cold (background) electron number density. We construct this matching region and determine how the matching wave amplitude varies throughout the region. Further, we specify a boundary in (Nh/N0,AT)-space that separates a region where only linear chorus wave growth can occur from the region in which fully nonlinear chorus growth is possible. We expect that this boundary should prove of practical use in performing computationally expensive full-scale particle simulations, and in interpreting experimental wave data.