Accession Number : AD0291755

Title :   RADIO MEASUREMENTS OF TWO TOTAL ECLIPSES

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s) : CASTELLI,JOHN P. ; COHEN,HELEN W.

Report Date : AUG 1962

Pagination or Media Count : 1

Abstract : Multi-frequency records of two total eclipses of the sun -- October 2, 1959 and February 15, 1961 -- have been analyze . The p sition of t e moon's limb during increases and decreases of the slopes of the eclipse curve was compared with optical maps and radi eliograms in an attempt to study the bright radio regions on the sun. A NGULAR DIAMETERS OF A FEW ENHANCED REGIONS WERE FOUND TO VARY BETWEEN ).+% AND !.<% MINUTE F ARC. The brightness temperature of one region wa 1.5 x 10 to the 5th power degrees K at 9700 mc and 9 x 10 to t e 5th power degrees K at 1270 mc. The heights of emitting regions at various frequencie ere calculated in two cases. No conclusions as to limb brightening could be reached because of the presence of enhanced radio regions near both limbs during both eclipses. The residual energy at totality on October 2 was approximately 20% at both 1300 and 3000 mc; on February 15, it was 8.6% at 9700 mc and 25.3% at 1 70 mc. (Author)

Descriptors :   *SOLAR ECLIPSES, BRIGHTNESS, ENERGY, MEASUREMENT, MOON, RADIO RANGES

Distribution Statement : APPROVED FOR PUBLIC RELEASE