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X-band noise temperature near the Sun at a 34-meter high efficiency antennaThe X-band system noise temperature near the Sun was measured at the DSS 15, a 34 meter high efficiency (HEF) antenna, in November 1987. Data was taken at angles off the center of the Sun from 0 to 4 degrees. At angles greater than 0.5 degree, the measured results agree with Voyager tracking data taken at solar conjunction in late December 1987. Within the solar disk, at angles lower than 0.27 degree, the temperature measured was lower than the prediction of a model by 30 percent, after adjusting for known receiver nonlinearities. The discrepancy in this extreme case is probably caused by unknown nonlinearities in the receiver, uncertainties in the model, or both. The measurement is nevertheless credible for practically all Sun-Earth-probe angles of interest to deep space missions.
Document ID
19880018816
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Rebold, T. A.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Peng, T. K.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Slobin, S. D.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
September 5, 2013
Publication Date
May 15, 1988
Publication Information
Publication: The Telecommunications and Data Acquisition Report
Subject Category
Solar Physics
Accession Number
88N28200
Funding Number(s)
PROJECT: RTOP 314-40-41-81-11
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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