Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phdt........31z&link_type=abstract
Thesis (PH.D.)--UNIVERSITY OF CALIFORNIA, BERKELEY, 1992.Source: Dissertation Abstracts International, Volume: 54-07, Section: B
Astronomy and Astrophysics
Astronomy
2
Radio Astronomy
Scientific paper
Electromagnetic waves travelling through the atmosphere experience an added phase shift due to the presence of various gases, primarily water vapor. This randomly added phase can seriously degrade the stellar maps produced by radio interferometers. This work investigates the effects of such a phase change, calculates the phase shift in terms of ground based measurements and then introduces a new technique to compensate for the atmospherically induced phase shift. The technique is implemented on the University of California, Berkeley, interferometer at Hat Creek, California, and various tests are performed to demonstrate the accuracy of the technique. Finally, an observation of the radio galaxy M87 is performed to demonstrate the system improvement, as well as provide measurements of the spectral index of M87 at 89GHz.
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