STUDY OF THE LAWS GOVERNING THE VARIATION OF THE REFRACTIVE INDEX IN WINTER,
Abstract
The problem of the theory and practice of geodesic leveling is studied. Special experimental investigations in the winter of 1966 on the variation of the refractive index during winter are described. The authors worked in the hilly and wooded areas of the Volyno-Podol'sk elevation. The grid points were mainly on hill tops not more than 40 meters difference in height and were 5 to 20 kilometers apart. The only other similar work was in the winter of 1953-1954 in the Carpathians, which determined the refractive index as a function of temperature and time of day and season. The present work concludes: (1) the refractive index assumes its greatest values in winter; (2) the diurnal curve possesses a clearly expressed asymmetry exaggerated in the morning; (3) the refractive index increases with negative temperatures and with prevailing positive gradient of the equivalent height; (4) the lower the height of the line of sight, the larger the amplitude of the diurnal curve of the index; (5) under winter conditions no leveling of the index is generally observed from directions of low equivalent heights, leveling of the index is possible only near midday hours at large equivalent heights; (6) for negative temperatures the accuracy of measurements of zenith distances is 1.5 times higher than for positive temperatures. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 20, 1970
- Accession Number
- AD0704202
Entities
People
- B. T. Tlustyak
- D. I. Maslich
- L. S. Khizhak
- S. G. Vlasenko
Organizations
- National Air and Space Intelligence Center