OBSERVATORY UPICE APRIL 2007 CZECH REPUBLIC FREQUENCY 32.8 MHz OBSERVING PERIOD 32.8 MHz 1. - 30. 0500 1700 APR FREQ STATION TYPE START TIME OF DUR FLUX DENS. REMARKS 2007 TIME MAXIMUM MIN PEAK MEAN UT UT 25 33 UPIC 3 S 1451.2 1451.8 1.0 NOT 27 33 UPIC 3 S 1122.0 1122.5 1.0 CALIBRATED 28 33 UPIC 40 F 0651.0 0652.2 12.5 29 33 UPIC 45 C 1646.0 1646.3 4.0 30 33 UPIC 40 F 1227.8 1228.0 19.7