ATMOSPHERIC LIGHT TRANSMISSION IN A WISCONSIN AREA.
Abstract
Air to surface transmission measurements were carried out to maximum slant range of 100,000 yards at different altitudes and weather conditions over Lake Michigan and Wisconsin farm land during March 1965. Total transmittance versus slant range for the visible and near infrared regions is introduced as smoothed, average curves and simplified exponential equations representing the last square fit to the experimental data under specific weather conditions. Peak transmittances in excess of 200 percent are observed under cloud-snow surface conditions and cloud conditions alone. Criteria for evidence of surface albedo differences are introduced, from which limited albedo effects are noted under cloudy, snow-covered surface conditions. The relationship between the total and direct attenuation coefficients can be simply expressed for clear sky conditions, good to excellent surface visibilities, and zero to about 80 percent snow cover. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1966
- Accession Number
- AD0803444
Entities
People
- Andrew Petriw
- Israel Cantor
Organizations
- United States Army Communications-Electronics Command