Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.8103m&link_type=abstract
American Astronomical Society, 192nd AAS Meeting, #81.03; Bulletin of the American Astronomical Society, Vol. 30, p.1154
Astronomy and Astrophysics
Astronomy
Scientific paper
Results are presented from phase correction efforts at the Owens Valley Radio Observatory millimeter array (OVRO). A water line monitor system has been installed on the six telescopes of the array. The system is a three channel radiometer system designed to measure the 22 GHz emission from atmospheric water vapor line. Phase variations in the millimeter regime are caused by fluctuating amounts of water vapor along the line-of-sight for the individual telescopes. By tracking the change in brightness of the water vapor line a correction can be derived which decreases the influence of the water vapor fluctuations. Phase corrected maps are shown illustrating the correction. The speed and direction of the fluctuation pattern can also be derived using the time series data from each of the telescopes. This technique is described and illustrated. The system will soon be in full operation at the array providing a quasi-realtime correction for recorded data.
Marvel Kevin B.
Woody David P.
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