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Title: Low-frequency measurements of the CMB (cosmic microwave background) spectrum

Low-frequency measurements of the CMB (cosmic microwave background) spectrum As part of an extended program to characterize the spectrum of the cosmic microwave background (CMB) at low frequencies, we have performed multiple measurements from a high-altitude site in California. On average, these measurements suggest a CMB temperature slightly lower than measurements at higher frequencies. Atmospheric conditions and the encroachment of civilization are now significant limitations from our present observing site. In November 1989, we will make new measurements from the South Pole Amnudsen-Scott Station at frequencies 0.82 1.5, 2.5, 3.8, 7.5, and 90 GHz. We discuss recent measurements and indicate improvements from a polar observing site. 11 refs., 2 figs.
Authors: ; ; ; ; ; ; ; ;
Publication Date:
OSTI Identifier:6830781
Report Number(s):LBL-28024; CONF-8906234--2
ON: DE90011589; CNN: DPP-8716548
DOE Contract Number:AC03-76SF00098
Resource Type:Conference
Resource Relation:Conference: Workshop on astrophysics in Antarctica, Newark, DE (USA), 8-10 Jun 1989
Research Org:Lawrence Berkeley Lab., CA (USA)
Sponsoring Org:DOE/ER; NSF
Country of Publication:United States
Language:English
Subject: 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 47 OTHER INSTRUMENTATION; COSMIC RADIATION; MEASURING METHODS; BACKGROUND RADIATION; FREQUENCY DEPENDENCE; MICROWAVE RADIATION; SPECTRA; TEMPERATURE DEPENDENCE; ELECTROMAGNETIC RADIATION; IONIZING RADIATIONS; RADIATIONS Astrophysics; Cosmology; Cosmic Radiation 640101* -- Astrophysics & Cosmology-- Cosmic Radiation; 440800 -- Miscellaneous Instrumentation-- (1990-)