RADIO MEASUREMENTS OF TWO TOTAL ECLIPSES
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1962
- Accession Number
- AD0291755
Entities
People
- Helen W. Cohen
- John P. Castelli
Organizations
- Air Force Cambridge Research Laboratories