Incidence of Alfvenic SC Pulse Onto the Conjugate Ionospheres

Incidence of Alfvenic SC Pulse Onto the Conjugate Ionospheres
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阿尔芬 SC 脉冲入射到共轭电离层上

DOI:
10.1029/2019ja027397
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发表时间:
2020
期刊:
Journal of Geophysical Research: Space Physics
影响因子:
--
通讯作者:
Edwards, Thom R.
Edwards, Thom R.
中科院分区:
--
文献类型:
--
作者:
Pilipenko, Vyacheslav A.;Fedorov, Evgeniy N.;Xu, Zhonghua;Hartinger, Michael D.;Engebretson, Mark J.;Edwards, Thom R.

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磁层-电离层电流系统的电路模拟有两个极端:电压发生器(当地面磁响应与电离层电导成比例时)和电流发生器(当地面磁响应实际上不依赖于电离层电导时)。非稳态场向电流以不同的方式与电离层相互作用,这取决于驱动时间尺度之间的比率。 和阿尔芬场线本征周期。高纬度地区的突发通信脉冲对应于以下情况:这种情况下的阿尔文脉冲传播独立远离赤道平面的分析研究磁层等离子体盒模型与薄的非对称共轭电离层。在高纬度地区,共轭电离层的振幅比一般不直接对应于电流或电压状态。理论预测支持的例子,在格陵兰岛和南极洲的共轭磁强计站点在夏季和冬季期间典型的SC事件观测。
A circuit analogy for magnetosphere‐ionosphere current systems has two extremes: the voltage generator (when the ground magnetic response is proportional to the ionospheric conductance) and the current generator (when the ground magnetic response practically does not depend on the ionospheric conductance). Nonsteady field‐aligned currents interact with the ionosphere in a different way depending on the ratio between the driver time scale and the Alfven field line eigenperiod . Sudden Commencement (SC) impulses at high latitudes correspond to the situation when . This case of Alfven pulses propagating independently away from the equatorial plane is analytically examined with the magnetospheric plasma box model with thin asymmetric conjugate ionospheres. At high latitudes the amplitude ratio in conjugate ionospheres in general does not correspond directly to either the current or voltage regimes. Theoretical predictions are supported by examples of typical SC event observations at conjugate magnetometer sites in Greenland and Antarctica during summer and winter periods.
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