Accession Number : AD0651420

Title :   OBLIQUE INCIDENCE IONOSPHERIC INVESTIGATIONS.

Descriptive Note : Final rept., Mar 66-28 Feb 67,

Corporate Author : WESTINGHOUSE ELECTRIC CORP LEESBURG VA DECO COMMUNICATIONS DEPT

Personal Author(s) : Davidson,David

Report Date : FEB 1967

Pagination or Media Count : 88

Abstract : Oblique incidence ionospheric soundings originated at Puerto Rico have been recorded at Maynard, Mass. The course of the MOF is close to the F2JF (predicted o-ray JF), especially in winter months. In summer months agreement is good if care is taken to segregate E sub s- and E-layer effects. Differential amplitude measurements made of F2 upper and lower rays near JF for selected days in a quiet month were compared with computed relative amplitudes in attempt to set limits on collisional absorption. Although assumed extrapolated mid-path profiles had many similarities, observed amplitudes do not generally follow predicted trend from models owing to incomplete description of the focusing, especially near JF. A crude upper limit on the peak F2 layer collisional frequency is 2000/sec. Values much lower are plausible at any one time as reference to recent aeronomix electron temperature determinations suggests. (Author)

Descriptors :   (*ATMOSPHERIC SOUNDING, *IONOSPHERIC PROPAGATION), PERIODIC VARIATIONS, MEASUREMENT, ABSORPTION, IONOSPHERE, FOCUSING

Subject Categories : Atmospheric Physics
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE