SUDDEN ENHANCEMENTS OF ATMOSPHERICS - SEA Month: FEBRUARY YEAR: 2009 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. 7 1051 1145 1114 1 2 54 2a UNCERTN 1256 1428 1311 1 2 92 5 UNCERTN 12 1342 1432 1354 1 2 50 5 Evaluated by J.Klimes