Energetic electron precipitation induced by space based VLF transmitters
Energetic electron precipitation induced by space based VLF transmitters
复制标题
天基甚低频发射机引起的高能电子沉淀
DOI：
10.1029/2008ja013120
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发表时间：
2008
影响因子：
--
通讯作者：
T. Bell
中科院分区：
文献类型：
--
作者：
P. Kulkarni;U. Inan;T. Bell
[1]采用带有朗道阻尼的数值射线追踪方法，计算了位于L = 2和L = 2.5、地磁赤道以及沿沿着每条磁力线的地磁纬度20°处的原地源引起的电子沉淀。根据Wang和Bell（1970）的磁等离子体天线辐射模型，我们考虑了在每个位置处的频率直接低于、近似等于和高于局部较低混合共振频率1 kHz，并且注入的射线在共振锥的3°内。从这种原位源注入的磁层反射（MR）哨声模式波以非常接近共振锥的波法向角传播。与单程相互作用相比，这样的MR波沉淀高达16倍以上的100 keV至5 MeV的电子。以更靠近磁场的初始波法线角注入的波，例如，45°时，实际上沉淀的>1 MeV电子比靠近共振锥注入的波少。
[1] Numerical raytracing with Landau damping is used to calculate electron precipitation that would be induced by in situ sources located at L = 2 and L = 2.5, at the geomagnetic equator and also at a geomagnetic latitude of 20° along each field line. In accordance with the Wang and Bell (1970) model of antenna radiation in a magnetoplasma, we consider frequencies immediately below, approximately equal to, and 1 kHz above the local lower hybrid resonance frequency at each location and injected rays within 3° of the resonance cone. The magnetospherically reflecting (MR) whistler-mode waves that are injected from such in situ sources propagate with a wave normal angle very close to the resonance cone. Compared to a single-pass interaction, such MR waves precipitate up to 16 times more 100 keV to 5 MeV electrons. Waves injected at initial wave normal angles closer to the magnetic field, e.g., 45°, in fact precipitate fewer >1 MeV electrons than waves injected close to the resonance cone.