Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-07-07
Astrophys.J. 616 (2004) L71
Astronomy and Astrophysics
Astrophysics
Accepted for publication in the SMA Special Volume of the ApJ Letters (9 pages of text, 3 figures)
Scientific paper
10.1086/423932
Phase noise caused by an inhomogeneous, time-variable water vapor distribution in our atmosphere reduces the angular resolution, visibility amplitude and coherence time of millimeter and submillimeter wavelength interferometers. We present early results from our total power radiometry phase correction experiment carried out with the Submillimeter Array on Mauna Kea. From accurate measurements of the atmospheric emission along the lines of sight of two elements of the array, we estimated the differential atmospheric electrical path between them. In one test, presented here, the phase correction technique reduced the rms phase noise at 230 GHz from 72$\degr$ to 27$\degr$ over a 20 minute period with a 2.5 second integration time. This corresponds to a residual differential electrical path of 98 $\mu$m, or 15 $\mu$m of precipitable water vapor, and raises the coherence in the 20 minute period from 0.45 to 0.9.
Battat James B.
Blundell Raymond
Moran James Michael
Paine Scott
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