Расчет облученности в точках на поверхности земли, создаваемой космическим аппаратом, излучающим в инфракрасном диапазоне

Calculation of irradiance at points on the earth's surface created by a spacecraft emitting in the infrared range

This article presents a method and results for calculating infrared irradiance on the Earth's surface generated by thermal radiation from a spacecraft. The numerical solution was obtained using the ANSYS software package. This package allows for calculating radiative heat exchange between bodies with complex geometries. The initial data used was the satellite's surface temperature distribution, obtained by solving a separate problem. It took into account external radiation fluxes falling on the surface, heat generation inside the spacecraft, and radiation interactions between structural elements. The solution to the irradiance problem was constructed in two stages. In the first stage, the angular distribution of the spacecraft's infrared radiation intensity was determined at various distances from it. Based on this data, near and far zones were distinguished. In the near zone, the strength of infrared radiation depended on both the direction of radiation propagation and the distance to the spacecraft. In the far zone, only the direction dependency remained. In the second stage, the calculated distribution of infrared radiation strength in the far zone was used to determine irradiances at points on the Earth's surface (the influence of the atmosphere was ignored). The results show that the irradiance value decreases with increasing distance from the spacecraft, with solar panels making a significant contribution to the irradiance value.