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🔥 Content Introduction
LOWTRAN7 is an atmospheric radiation and transmission model released by the Air Force Research Laboratory (AFRL) in August 1988. This project translates the solar and lunar models of LOWTRAN7 into Matlab. It is important to note that LOWTRAN7 has been replaced by MODTRAN and SAMM. For high-quality solar and lunar images, the AFRL’s CBSD model should be used. However, it remains valuable as an educational model for K12 and undergraduate students. LOWTRAN 7 is a low-resolution propagation model and computer code used to predict atmospheric transmittance and sky thermal scattering radiation in the range of 0 to 50,000 cm-1, with a resolution of 20 cm-1.
In LOWTRAN7, direct or scattered rays from the sun or moon can be calculated. The solar irradiance is interpolated through the spectrum and applies orbital corrections to compensate for the eccentricity of the Earth’s orbit. The lunar irradiance is calculated using a mathematical model developed and published by Robert E. Turner et al. (1975), which appeared in the Environmental Research Institute of Michigan’s “NATURAL AND ARTIFICIAL ILLUMINATION IN OPTICALLY THICK ATMOSPHERES” (AD-A021 998, Contract No. DAAA21-74-C-0331). (A PDF version of this document is included for download.) The lunar model applies the spectral geometric albedo, phase factor, and angular radius of the moon known in 1988 to calculate the solar spectrum after orbital correction. The results are displayed in the project images.
⛳️ Running Results
📣 Sample Code
ARY
%% *outputs*
% outSCTANG – (deg) scattering angle (angle between source ray and LOS)
%% *history*
% 20190407 mnoah translated from LOWTRAN7 fortran code
% annotation added to explain variables
if (IARB ~= 0)
% SPECIAL CASES IF PSI IS ARBITRARY
outSCTANG = acosd(cosd(SUNZEN)*cosd(PTHZEN));
else
% GENERAL CASE
outSCTANG = acosd(sind(SUNZEN)*sind(PTHZEN)*cosd(PSI)+cosd(SUNZEN)*cosd(PTHZEN));
end
end
🔗 References
🎈 Some theoretical references are from online literature; if there is any infringement, please contact the author for removal.
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