Exospheric Studies and Geocoronal Applications

本提案概述了一项为期三年的研究计划：(1)采取最后步骤，制定和应用路径积分方法来研究热层和外逸层之间过渡区域的碰撞动力学；(2)构建地球日冕模型，以评估外逸层对，热层变化和磁层过程。在整个过程中，基于CHARM项目中获得的经验，应用程序面向可观察或可测量的数量。构成本提案的具体任务是：O完成估算外逸层与以碰撞为主的热层之间过渡区外逸层成分动力学分布函数的算法开发；并将其纳入现实的氢地冕动力学模型中，考虑到氢原子与O和He的弹性碰撞，以及利用现实的上层电离层模型与H+和O+的电荷交换碰撞，o开展环流与地冕相互作用的案例研究（从安静时间案例开始，使用AMPTE-CCE衍生的经验模型），定量评估低纬度和中纬度热层上的高能粒子通量（以及由此产生的气辉辐射）；在风暴时环电流增强的情况下，为了确定是否有足够的能量沉积到热层以影响全球的地冕（即定量调查反馈），o进一步发展辐射传输代码以处理非等温热球，并对过去二十年收集的Lyman和Balmer数据集进行统一分析，o将地球日冕模型汇编成一致的参考集；并使用这一集合来确定最近开发的分析建模方案中定义的参数值，作为地球物理和太阳指数的函数，从而为其他地球空间研究领域的工作人员提供一个方便的地球日冕表示，O和继续理论发展的外逸层受非重力的力量。

This proposal outlines a three-year plan of research for (1) taking the final steps toward formulating and applying a path- integral approach to the collisional kinetics of the transition region between the thermosphere and exosphere, and (2) constructing geocoronal models with the goal for assessing the response of the exosphere to, and interaction with, thermospheric variations and magnetospheric processes. Throughout, the applications are geared toward observable or measurable quantities, based on the experience gained during the CHARM project that is currently winding down. The specific tasks making up this proposal are: o to complete the development of an algorithm for evaluating the kinetic distribution function of exospheric constituents in the transition zone between the exosphere and the collisionally-dominated thermosphere, and to incorporate this into realistic kinetic models of the hydrogen geocorona taking into account elastic collisions of atmomic H with O and He and charge-exchange collisions with H+ and O+ using realistic topside ionosphere models, o to carry out case studies of the interaction between the ring current and geocorona (beginning with quiet-time cases, using AMPTE-CCE -derived empirical models) to evaluate quantitatively the energetic particle flux onto the low- and mid-latitude thermosphere (and airglow emissions arising thereform), and in the case of storm-time ring current enhancements, to ascertain whether there is enough energy deposited into the thermosphere to affect the geocorona globally (i.e. to quantitatively investigated feedbacks), o to further develop a radiative transfer code to address non- isothermal thermospheres and to carry out unified analyses of Lyman and Balmer datasets collected over the last two decades, o to compile geocoronal models into a consistent reference set, and to use this set to determine values for parameters defined within a recently-developed analytic modeling scheme as functions of geophysical and solar indices, thereby providing workers in other areas of geospace research with a convenient representation of the geocorona, o and to continue the theoretical development of exospheres subject to non-gravitational forces to.