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arXiv 1503.08122astro-ph.EP
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行星外太空层理论：II。辐射压对外大气密度廓线的影响

Theory for planetary exospheres: II. Radiation pressure effect on exospheric density profiles

Arnaud Beth, Philippe Garnier, Dominique Toublanc, Iannis Dandouras, Christian Mazelle

发表信息：
Icarus, Volume 266, 1 March 2016, Pages 410-422
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摘要：

行星外太空层在其外部知之甚少，因为中性密度与仪器的探测能力相比很低。因此，外逸层模型往往是这种高空的主要信息来源。我们提出了一种新的方法来考虑解析辐射压力的附加效应的行星外球。在一系列的论文中，我们提出了一个哈密顿方法的辐射压力的动力学轨迹，密度分布和逃逸的热通量的影响。我们的工作是对Bishop和Chamberlain（1989）研究的概括。在第二部分的工作中，我们给出了在辐射压力作用下，行星外球面中氢原子的密度分布。我们首先提供弹道粒子（在大多数情况下占主导地位的外逸层人口）的高度分布，表现出强烈的不对称性，解释了地球上已知的地磁尾现象。与纯重力情况（即张伯伦轮廓）相比，辐射压强烈地增强了密度，特别是在中午和午夜。最后，我们表明存在一个exopause，自然出现的外部限制有界粒子，以上所有粒子逃逸。

英文摘要：

The planetary exospheres are poorly known in their outer parts, since the neutral densities are low compared with the instruments detection capabilities. The exospheric models are thus often the main source of information at such high altitudes. We present a new way to take into account analytically the additional effect of the radiation pressure on planetary exospheres. In a series of papers, we present with an Hamiltonian approach the effect of the radiation pressure on dynamical trajectories, density profiles and escaping thermal flux. Our work is a generalization of the study by Bishop and Chamberlain (1989). In this second part of our work, we present here the density profiles of atomic Hydrogen in planetary exospheres subject to the radiation pressure. We first provide the altitude profiles of ballistic particles (the dominant exospheric population in most cases), which exhibit strong asymmetries that explain the known geotail phenomenon at Earth. The radiation pressure strongly enhances the densities compared with the pure gravity case (i.e. the Chamberlain profiles), in particular at noon and midnight. We finally show the existence of an exopause that appears naturally as the external limit for bounded particles, above which all particles are escaping.

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