SUDDEN ENHANCEMENTS OF ATMOSPHERICS - SEA Month: APRIL 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. 1 1736U 1759D 1752 1 2 23D 4 9 0724 0818 0735 1 2 54 3 11 0659 0756 0715 3 3 57 5 1011 1025 1017 1 2 14 6 PREFLARE 1025 1148 1043 1 3 83 5 14 1201 1227 1205 1 2 26 5 UNCERTN 21 0924 0958 0933 1 2 34 3 1601 1642 1611 1 2 41 3 22 1026 1058 1031 2 3 32 1 23 1412 1452 1417 2 4 40 1 1500 1553 1525 1 2 53 3 26 0624 0731 0628 2 3 67 5 1253 1344 1301 1 3 51 5 1541 1642 1548 1 3 61 5 27 0619 0707 0630U 1 2 48 3 1209 1302 1217 1 2 53 5 28 1555 1618 1600 1 2 23 5 Evaluated by J.Klimes