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arXiv 0901.0047physics.space-ph
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太阳帆空间环境效应的微观分析

Microscopic Approach to Analyze Solar-Sail Space-Environment Effects

Roman Ya. Kezerashvili, Gregory L. Matloff

摘要:

研究了近太阳空间环境对金属薄膜太阳帆和充气空体太阳帆的影响。分析了太阳辐射与太阳帆材料的相互作用。该分析评估了太阳辐射压力加速过程中最坏情况下的太阳辐射效应。研究了太阳帆厚度与温度和太阳辐射电磁波谱波长的关系。分析了光子、电子、质子和氦核与帆材料原子、原子核以及充气填充气体分子相互作用的物理过程。计算使用保守假设,其中太阳光子、电子和质子与原子、原子核和氢分子相互作用的可用截面具有最高值。结果表明,对于高能光子、电子和质子,铍帆基本上是透明的。帆材料将被太阳紫外线和低能太阳电子部分电离。对于空心体,考虑了光子帆效应,包括氢通过太阳帆壁的扩散和静电压力。由于帆材料的抗拉强度随着温度升高而降低,因此可能需要减轻由带电帆的电场引起的静电压力。

英文摘要:

Near-sun space-environment effects on metallic thin films solar sails as well as hollow-body sails with inflation fill gas are considered. Analysis of interaction of the solar radiation with the solar sail materials is presented. This analysis evaluates worst-case solar radiation effects during solar-radiation-pressure acceleration. The dependence of the thickness of solar sail on temperature and on wavelength of the electromagnetic spectrum of solar radiation is investigated. Physical processes of the interaction of photons, electrons, protons and helium nuclei with sail material atoms and nuclei, and inflation fill gas molecules are analyzed. Calculations utilized conservative assumptions with the highest values for the available cross sections for interactions of solar photons, electrons and protons with atoms, nuclei and hydrogen molecules. It is shown that for high-energy photons, electrons and protons the beryllium sail is mostly transparent. Sail material will be partially ionized by solar UV and low-energy solar electrons. For a hollow-body photon sail effects including hydrogen diffusion through the solar sail walls, and electrostatic pressure is considered. Electrostatic pressure caused by the electrically charged sail's electric field may require mitigation since sail material tensile strength decreases with elevated temperature.

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