SUDDEN IONOSPHERIC OF DISTURBANCES - SID Month: MAY YEAR: 2017 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 4. 0830 1456 11. 1110 1525 18. 0833 1333 25. 0830 1422 Evaluated by J.Klimes