SUDDEN ENHANCEMENTS OF ATMOSPHERICS - SEA Month: AUGUST YEAR: 2021 Observing Station: OBSERVATORY U P I C E CZECH REPUBLIC Lat.: 50 30 26.6 N Sea level: 416 m Long.: 16 00 43.5 E Frequency: 27 kHz Band pass: 308 Hz a 3 dB Chart speed: 3.4 cm/H Recorder time constant: 27 sec Date Start End Max. Imp. Def. Dur. Type REMARKS UT UT UT SEA min. 20 1545 1629 1552U 1 2 44 5 UNCERTN 28 0548 0757 0714 2 3 129 5 NO OBSERVATION 24.0000 2400 31.0000 2400 Evaluated by J.Klimes