Solar radiation at 4 MM wave length.

Abstract

view Abstract Citations (2) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Solar radiation at 4 MM wave length. Coates, Robert J. Abstract Measurements of solar radiation at 4 mm wave length were started at the U. S. Naval Research Laboratory in July 1956. The antenna used is a io-foot precision parabolic reflector having a beam width of 6'. Scans across the disc of the sun have been made under different sunspot conditions over a period of several months. These indicate that the sun at 4 mm wave length is very close to a uniform disc with a diameter about one per cent larger than that of the optical disc. A slight increase of the order of two per cent is noted at the positions of large sunspots. The average of these solar measurements gives a corrected solar antenna temperature of ~6oo0K with an uncertainty of ~ 4oo0K. These measurements were corrected for the atmospheric attenuation which usually is the order of fifty per cent at the sun's altitude on the meridian. Naval Research Laboratory, Washington, D. C. Publication: The Astronomical Journal Pub Date: 1957 DOI: 10.1086/107633 Bibcode: 1957AJ.....62R..90C full text sources ADS |