SUDDEN ENHANCEMENTS OF ATMOSPHERICS - SEA Month: APRIL YEAR: 2006 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 1616 1643 1627 1 2 27 5 2 1016 1109 1021 1 2 53 5 3 1202 1335 1209 1 2 93 3 1556 1615 1602 1 2 19 5 1631 1650 1634 1 2 19 5 4 1200 1316 1201 1 2 76 5 5 0932 1053 1013U 1 2 81 3 1306 1334 1312 1 2 28 5 1518 1612 1524 2 4 54 1 6 0530 0600D 0538 2 3 30D 5 10 1456 1541 1502 1 2 45 5 15 1127 1151 1139U 1 2 24 2a 21 1502 1539 1514 1 2 37 5 1540 1626 1548U 1 2 46 5 26 1420 1551 1455U 1 3 91 2a 1559 1639 1609 1 2 40 5 1646 1803 1705 2 4 77 5 27 1545 1702 1554 2 4 77 5 28 1334 1500 1337U 1 2 86 5 1531 1607 1537 1 2 36 3 29 0725 0820 0740U 1 2 55 3 1349 1416 1354U 1 2 27 6 1558 1721 1633U 1 2 83 3 The evaluation is not available for a strong radio disturbation: Date From To Date From To Date From To 03 0650 0915 06 0600 0850 07 0710 0900 08 0615 0740 09 0550 0710 10 0510 0755 12 0820 0900 13 0825 1345 15 0550 1030 16 0925 1415 17 0715 1355 18 0810 0950 19 0530 1015 20 0635 0940 20 1240 1510 21 0645 1130 22 0530 1540 23 0600 0715 23 1120 1300 24 0400 1530 25 0530 1530 26 0530 1410 27 0500 1515 30 0900 1800 Evaluated by L.Krivsky and J.Klimes