SUDDEN IONOSPHERIC OF DISTURBANCES - SID Month: JANUARY YEAR: 2021 Observing Station: OBSERVATORY U P I C E CZECH REPUBLIC Transmitter coordinates: Receiver coordinates: Lat.: 63 51 1.31 N Lat.: 50 30 26.6 N Long.: 22 28 0.38 W Long.: 16 00 43.5 E Sea level: 416 m Frequency: 37.5 kHz Band pass: 308 Hz a 80 dB Chart speed: 3.4 cm/H Recorder time constant: 1 min Date Start End Max. Imp. Def. Dur. Type REMARKS UT UT UT SID min. NO EVENTS NO OBSERVATION 7. 0750 1320 14. 0800 1310 21. 1000 1320 28. 0810 1310 Evaluated by J.Klimes