Astronomy and Astrophysics – Astronomy
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sass...27...33r&link_type=abstract
The Society for Astronomical Sciences 27th Annual Symposium on Telescope Science. Held May 20-22, 2008 at Big Bear Lake, CA. Pub
Astronomy and Astrophysics
Astronomy
Scientific paper
A research project is contemplated that seeks to observe solar plasma motions by monitoring amplitude changes over time in the Sun's microwave emissions. A small KU-band radio telescope is employed as a total-power radiometer. Before meaningful measurements can be made, the radio telescope must be characterized. Circuit in-stabilities, local oscillator drift, and thermal changes can cause the radiometer's gain to fluctuate over time and its output amplitude to vary independent of the phenomenon being observed. The present effort quantifies these variations at two different frequencies, and two orthogonal polarizations, with the radiometer observing for two hours a radio source of assumed constant noise temperature (a group of trees subtending the antenna's beam-width). The resulting data are statistically analyzed to determine system mean and variance over time for all four channels, as well as cross-correlations among these channels. This analysis validates the system for subse-quent solar observations.
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