SUDDEN ENHANCEMENTS OF ATMOSPHERICS - SEA Month: DECEMBER YEAR: 2007 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. 6 1300 1402 1326U 1 2 62 3 15 0933 1020 0938 1 2 47 5 UNCERTN 26 1325 1358 1333 1 2 33 5 UNCERTN 29 1446 1530 1455 1 2 44 5 UNCERTN 30 1014 1103 1026U 1 2 49 3 1202 1259 1220 1 2 57 3 1259 1342 1318U 1 2 43 5 31 1255 1331 1310U 1 2 36 3 Evaluated by J.Klimes