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 highe...

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Bibliographic Details
Main Authors: Kogut, A., Bensadoun, M., De Amici, G., Levin, S., Limon, M., Smoot, G. ), Sironi, G. . Dipt. di Fisica), Bersanelli, M., Bonelli, G. )
Language:unknown
Published: 2008
Subjects:
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
South Pole
South pole
Online Access:http://www.osti.gov/servlets/purl/6830781
https://www.osti.gov/biblio/6830781
Description
Summary: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.

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