SUDDEN ENHANCEMENTS OF ATMOSPHERICS - SEA Month: APRIL YEAR: 2012 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. 18 1234 1314 1247 1 3 40 5 1511 1548 1518 1 3 37 5 1700 1728 1709 1 2 28 6 19 1119 1211 1129 1 4 52 5 20 1655 1725 1705 1 2 30 2b UNCERTN 24 0741 0825 0753 1 2 44 3 27 0820 0852 0827 1 2 32 5 30 0700 0814 0710U 1 2 74 3 UNCERTN 1025 1057 1035 1 2 32 3 UNCERTN NO OBSERVATION 9.; 10.; 14. and 15.4.2012 Evaluated by J.Klimes