Mesoscale Auroral Plasma Transport

这项拟议的工作主要是利用UAH近年来发展起来的广义半动力学(GSK)技术来研究极光通量管上电离层等离子体的中尺度输运和能量。这种离子-INCELL/广义电子流体混合方法已经显示出在中尺度(几个RE)上处理电离层等离子体输运的独特能力，这些输运受不稳定驱动的微过程以及磁层等离子体支持的势和波加热的组合等效应的影响。这种方法结合了通常在“流体”模型中发现的过程的自洽，同时允许对离子分布形成的详细研究通常仅限于测试粒子研究。利用新开发的技术和以前开发的方法，研究领域将包括：极光通量管的反应和等离子体对极光电子束的输运；具有自洽电离的高能等离子体片状等离子体和电流；随时间变化的波驱动二次曲线生成；以及热等离子体驱动势和波场的协同效应，包括势本身的发展。这项研究的新技术进展将包括：(1)将极光电子束纳入输运描述的电动力学；(2)开发将GSK方法耦合到低F区和E区电离层的技术，并对这些电子束产生的自洽电离和流出给予特别考虑；(3)改进处理热磁层等离子体与电离层流出的一般电动力学相互作用的方法；(4)开发改进的算法，将电流驱动离子回旋不稳定的影响纳入动力学和广义传输模型。最后，将计算结果与DE-1、Polar、Viking、Akebono、Freja等航天器的极光离子分布函数测量结果进行了交互比较。

The proposed work is to study the mesoscale transport and energization of ionospheric plasmas on auroral flux tubes primarily with the Generalized SemiKinetic (GSK) techniques developed in recent years at UAH. This hybrid ion-incell/generalized electron fluid approach has demonstrated unique capabilities for treating, over mesoscale (several RE), the transport of ionospheric plasma under the influence of such effects as instability-driven microprocesses and the combination of magnetospheric plasma- supported potentials and wave heating. This approach incorporates the self-consistency of processes normally found in "fluid" models while allowing the detailed study of ion distribution formation normally restricted to test-particle studies. Using the newly- developed techniques together with previously developed methods the areas of investigation will include: the reaction of an auroral flux tube and plasma transport to auroral electron beams; energetic plasma sheet plasmas and electric currents with self-consistent ionization; time-dependent wave-driven conic generation; and synergistic effects of hot plasma-driven potentials and wave fields, including the development of the potentials themselves. New technical advances in this research will include: (1) Incorporation of auroral electron beams into the electrodynamics of the transport description; (2) Development of techniques for coupling the GSK approach into the lower F and E-region ionosphere, with specific allowance for self-consistent ionization and outflow generated by these electron beams; (3) Improved approaches for treating the general electrodynamic interaction of hot magnetospheric plasmas with the ionospheric outflow; and (4) Development of improved algorithms for the incorporation of effects of the Current-Driven Ion Cyclotron Instability (CDICI) into kinetic and generalized transport models. Finally, interactive comparisons of the results with auroral ion distribution function measurements from D E-1, Polar, Viking, Akebono, Freja and other spacecraft are proposed.