Evolution of electron pitch angle distributions following injection from the plasma sheet
Evolution of electron pitch angle distributions following injection from the plasma sheet
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DOI：
10.1029/2010ja016245
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发表时间：
2011-04
影响因子：
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通讯作者：
X. Tao;R. Thorne;Wen Li;B. Ni;N. Meredith;R. Horne
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文献类型：
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作者：
X. Tao;R. Thorne;Wen Li;B. Ni;N. Meredith;R. Horne
[1]本文用准线性扩散方程研究了中等地磁活动期间等离子体片电子（100 eV-30 keV）在L = 6处注入到夜面的相空间密度随时间的演化。散射的能量和俯仰角在相互作用过程中与哨声模式合唱波和电子回旋谐波包括使用一个改进的波模型最近获得的CRRES航天器数据。我们比较我们的模拟结果与观察从THEMIS航天器，并表明，所观察到的电子俯仰角分布的形成主要是由于共振相互作用的组合，上，下带合唱波。煎饼分布在低能量（E3 keV）的解释使用带状合唱波结构的功率最小值在一半的电子回旋频率。目前的工作结果可以用来模拟等离子体片电子的动力学演化和由此产生的全球分布。
[1] The temporal evolution of the phase space density of plasma sheet electrons (100 eV–30 keV) injected into the nightside at L = 6 during moderate geomagnetic activity is investigated using a quasi-linear diffusion formulation. Scattering in energy and pitch angle during interactions with both whistler mode chorus waves and electron cyclotron harmonic waves are included using an improved wave model recently obtained using CRRES spacecraft data. We compare our simulation results with observations from the THEMIS spacecraft and demonstrate that the formation of the observed electron pitch angle distributions is mainly due to resonant interactions with a combination of upper and lower band chorus waves. The pancake distributions at low energies (E 3 keV) are explained using the banded chorus wave structure with a power minimum at half the electron cyclotron frequency. Results of the current work can be used to model the dynamical evolution and resultant global distribution of plasma sheet electrons.