PSF (point spread function) or beampattern (raster fly map) of the sun measured with a 5m dish and Callisto spectrometer.
Angular range = +/-12° in azimuth and in elevation while tracking the sun
Angular stepsize in elevation = 0.25°
Scanning speed 1200 rpm (0.4°/s)
Startime = 06:35:18UT
Stoptime = 08:44:00 UT
Contour plot of the same data set. Peak amplitude produced by the sun in left circular polarization is about 4 dB.