LOWTRAN Manual

LOWTRAN 5

This report describes a computer code for predicting atmospheric transmittance and thermal radiation emitted by the atmosphere and earth from 350 to 40,000 cm-1 at a spectral resolution of 20 cm-1. The prgoram is based on the LOWTRAN 4 (1978) computer code. New altitude and relative-humidity dependent aerosol models and new fog models are included in the code. In addition, the new code structure consists of a main program and 19 subroutines.

The computer code contains representative (geographical and seasonal) atmospheric models and representative aerosol models with an option to replace them with user-derived or measured values. The program can be run in one of two modes, namely, to compute only atmospheric transmittance or both atmospheric transmittance and radiance for any given slant path geometry.



LOWTRAN 6

This report describes a computer code for predicting atmospheric transmittance and thermal radiation emitted by the atmosphere and earth from 350 to 40,000 cm-1 at a spectral resolution of 20 cm-1. The program is based on the LOWTRAN 5 (1980) computer code. Solar/lunar scattered radiation has been added to the code, as well as new spherical refractive geometry subroutines and an improved water vapor continuum model. Other modifications to the code include a wind-dependent maritime aerosol model, a vertical structure aerosol model, a cirrus cloud model, and a rain model.

The computer code contains representative (geographical and seasonal) atmospheric models and representative aerosol models with an option to replace them with user-derived or measured values. The program can be run in one of three modes, namely, to compute only atmospheric transmittance, to compute atmospheric transmittance and radiance, or to compute atmospheric transmittance, atmospheric radiance, and scattered solar/lunar background radiance for a given slant path geometry.



LOWTRAN 7

This report is the AFGL Users Guide to operating LOWTRAN 7. A more detailed scientific report describing the basic physical assumptions and theories utilized by the LOWTRAN models as well as the documented verification of the code will be forthcoming in a seperate report.

Section 1.1 contains a brief discussion of the LOWTRAN model followed by a description of the basic capabilities and the additional features added to the LOWTRAN 7 computer code. Section 2 discusses the code structure, portability and availability. The complete operating instructions for LOWTRAN 7 are described in Section 3. Section 3 includes detailed explainations for the various modes of execution of the program, the many choices of utilizing models (molecular, aerosols and or particulates) included in the code, as well as the different methods of replacing these models by user inserted data.

A discussion of 4 test cases and a description of the program output to tapes 6,7, and 8 are included in Section 4.

The three Appendixes describe the LOWTRAN 7 plot program, filter function program and newly written scanning function program.

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