About Modtran
MODTRAN® is a "narrow band model" atmospheric radiative transfer code. The atmosphere is modeled as stratified (horizontally homogeneous), and its constituent profiles, both molecular and particulate, may be defined either using built-in models or by user-specified vertical profiles. The spectral range extends from the UV into the far-infrared (0 – 50,000 cm-1), providing resolution as fine a 0.2 cm-1.
MODTRAN® solves the radiative transfer equation including the effects of molecular and particulate absorption/emission and scattering, surface reflections and emission, solar/lunar illumination, and spherical refraction.
Outputs include:
- narrow spectral band direct and diffuse transmittances
- path component and total radiances
- transmitted and top-of-atmosphere solar/lunar irradiances
- horizontal fluxes
- cooling rates
- and more...
With over a 30 year heritage, MODTRAN® has been extensively validated, and it serves as the community standard atmospheric band model.

