OBSERVATORY UPICE SEPTEMBER 2021 CZECH REPUBLIC FREQUENCY 33 MHz OBSERVING PERIOD 33 MHz 1. - 30. 0500 1700 NO OBSERVATION 33 MHz 1. 0500 1700 SEP FREQ STATION TYPE START TIME OF DUR FLUX DENS. REMARKS 2021 TIME MAXIMUM MIN PEAK MEAN UT UT 33 UPIC NO EVENTS NOT CALIBRATED