Accession Number : ADA206773

Title :   Users Guide to LOWTRAN 7

Descriptive Note : Interim scientific rept.

Corporate Author : AIR FORCE GEOPHYSICS LAB HANSCOM AFB MA

Personal Author(s) : Kneizys, F X ; Shettle, E P ; Abreu, L W ; Chetwynd, J H ; Anderson, G P

Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a206773.pdf

Report Date : 16 Aug 1988

Pagination or Media Count : 146

Abstract : LOWTRAN 7 is a low-resolution propagation model and computer code for predicting atmospheric transmittance and background radiance from 0 to 50,000 cm -1 at a resolution of 20 cm -1. The code is based on the LOWTRAN 6 (1983) model. 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. This report contains a description to users for operating the LOWTRAN 7 computer code. It summarizes the capabilities of the new code, provides complete operating instructions as well as input and output from test cases for user validation. Also included are operating instructions for three programs that utilize LOWTRAN 7 output (plot, filter and scanning function programs). Keywords: Computer program documentation, Subroutines, Radiative transfer, Aerosols, Clouds, Attenuation, Lowtran, Computer code, Ultraviolet, Visible, Infrared.

Descriptors :   *COMPUTER PROGRAM DOCUMENTATION , *ATMOSPHERIC SCATTERING , *RADIATION ATTENUATION , *ATMOSPHERE MODELS , SCANNING , COMPUTER PROGRAMS , USER MANUALS , FUNCTIONS , PROPAGATION , CLOUDS , AEROSOLS , INFRARED SIGNATURES , VALIDATION , MODELS , WIND , PATHS , RADIATIVE TRANSFER , OXYGEN , RAIN , RADIANCE , USER NEEDS , GEOMETRY , ABSORPTION , SUBROUTINES , DESERTS , BACKGROUND RADIATION , OZONE , MOLECULAR PROPERTIES , ATMOSPHERIC ATTENUATION , LOW RESOLUTION , SLANT RANGE , CIRRUS CLOUDS , EXTRATERRESTRIAL RADIATION

Subject Categories : Atmospheric Physics
      Computer Programming and Software
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE