Accession Number : AD0772960

Title :   Estimates of the Extinction of Electromagnetic Energy in the 8 to 12 micrometer Range by Natural Atmospheric Particulate Matter.

Descriptive Note : Research and Development technical rept.,


Personal Author(s) : Lentz,W. J. ; Hoidale,G. B.

Report Date : JAN 1974

Pagination or Media Count : 32

Abstract : DA-1-T-061102-B-53-A-18ECOM5528*Atmospheres, *Dust, Absorption spectra, Infrared spectra, Far infrared radiation, New MexicoAtmospheric attenuationExtinction coefficients, based on atmospheric dust sampled over southern New Mexico, are tabulated at 0.2 micrometer intervals from 8.0 to 12.0 micrometers for mass concentrations of 1000, 100, and 10 microgram/cubic meter. At a concentration of 1000 microgram/cubic meter, the peak extinction of about 0.1/km occurs at 9.6 micrometers. The method employed uses Mie theory to extrapolate the measured extinction of a suspension of dust in potassium bromide to the extinction of the dust suspended in air. Over the Middle East and North Africa it is estimated that concentrations of 1000 microgram/cubic meter and greater occur on an average of 50 to 150 days per year. (Author)

Descriptors :   *Atmospheres, *Dust, Absorption spectra, Infrared spectra, Far infrared radiation, New Mexico

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE