Auroral precipitation/ion upwelling as a driver of neutral density enhancement in the cusp

Auroral precipitation/ion upwelling as a driver of neutral density enhancement in the cusp
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极光降水/离子上升流作为尖点中性密度增强的驱动因素

DOI:
10.1016/j.jastp.2012.03.003
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发表时间:
2012
影响因子:
1.9
通讯作者:
Lessard
Lessard
中科院分区:
地球科学4区
文献类型:
--
作者:
Sadler;Lessard

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软电子沉淀与离子上涌合作的研究作为一个可能的驱动器的尖点中性密度增强发现的CHAMP卫星。一个随时间变化的三流体数值模式被用来模拟垂直电离层和热层对这类事件的响应。将来自FAST卫星的粒子数据输入到模型中,该数据来自与CHAMP的单个有利的会合对准事件。结果表明,随高度变化的中性密度增强伴随着由软电子沉淀驱动的离子上涌。增强机制总结如下。足够软的电子沉淀将能量转移到周围的电子“气体”,其随后经历热(向上)膨胀。这建立了一个垂直的双极电场,将离子向上拉。向上流动的离子所携带的动量是显著的,并且结果表明它能够向上拖曳中性气体以在F区域上方创建密度结构。
Soft electron precipitation in collaboration with ion upwelling is investigated as a possible driver of the cusp neutral density enhancement discovered by the CHAMP satellite. A time-dependent, three-fluid numerical model is used to simulate the vertical ionospheric and thermospheric response for this type of event. Particle data from the FAST satellite from a single favorable conjunction alignment event with CHAMP are input to the model. Results are given which suggest that altitude-dependent neutral density enhancements accompany ion upwelling that is driven by soft electron precipitation. The enhancement mechanism is summarized as follows. Sufficiently soft electron precipitation transfers energy to the ambient electron “gas”, which subsequently undergoes a thermal (upward) expansion. This establishes a vertical ambipolar electric field which pulls the ions upward. The momentum carried by up-flowing ions is significant and results show it to be capable of dragging neutral gas upward to create density structures above the F-region.
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