Solar Sail: Materials and Space Environmental Effects

TL;DR

This paper examines the physical interactions and degradation mechanisms of solar sail materials under solar electromagnetic and particle radiation, analyzing how these factors affect material properties and performance in space.

Contribution

It provides a theoretical analysis of solar sail material degradation due to solar radiation and particle interactions, including temperature and wavelength dependencies.

Findings

Reflectivity and absorption depend on temperature and wavelength.

Temperature increases as the sail approaches the Sun, following T r^(-2/5).

Interactions lead to material degradation and ionization.

Abstract

Theoretical aspects of a solar sail material degradation are presented when the solar electromagnetic and corpuscular forms of radiation were considered as sources of degradation. The analysis of the interaction of two components of solar radiation, the electromagnetic radiation and radiation of low- and high-energy electrons, protons, and helium ions emitted by the Sun with the solar-sail materials is discussed. The physical processes of the interactions of photons, electrons, protons and alpha-particles with sail material atoms and nuclei, leading to the degradation and ionization of solar sail materials are analyzed. The dependence of reflectivity and absorption for solar sail materials on temperature and on wavelength of the electromagnetic spectrum of solar radiation is investigated. It is shown that the temperature of a solar sail increases approximately as T r^(-2/5), with the decrease of the heliocentric distance r, when are taking into account the temperature dependence of optical parameters of the solar sail material.