SUDDEN ENHANCEMENTS OF ATMOSPHERICS - SEA Month: FEBRUARY YEAR: 2013 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. 5 0818 0854 0822 1 2 36 3 6 1407 1503 1419 1 2 56 5 UNCERTN 8 0911 1007 0937 1 2 56 5 17 1532 1547 1541 1 2 15 6 PREFLARE 1547 1627 1552 3 4 40 1 20 1110 1130 1116 1 2 20 5 UNCERTN 23 0941 1027 0958 1 2 46 3 1601 1624 1609 1 2 23 6 25 1410 1544 1438U 1 2 94 3 UNCERTN Evaluated by J.Klimes