United States of America As Represented by the Secretary of the Air Force

Shepard A Clough

Gail P Anderson

James H Chetwynd

Francis X Kneizys

Eric P Shettle

Leonard W Abreu

William O Gallery

John E Selby

LOWTRAN 7 is a low-resolution propagation model and computer code for predicting atmospheric transmittance and background radiance from 0 to 50,000 cm.sup.- at a resolution of 20 cm.sup.-. The code is based on the LOWTRAN 6 (1983) model with a number of improvements. Multiple scattered radiation has been added to the model as well as new molecular band model parameters and new ozone and molecular oxygen absorption parameters for the UV. Other modifications include a wind-dependent desert model, new cirrus cloud models, and new cloud and rain models. The code also includes new representative (geographical and seasonal) atmospheric models and updated aerosol models with options to replace them with user-derived values. An improved extra-terrestrial solar source function is also included. Six modes of program execution are allowed with the new model and computer code for a given slant path geometry.

System for modelling low resolution atmospheric propagation

Growing community of inventors

Lexington, MA, United States of America

Shepard A Clough