AAVSO Sudden Ionospheric Disturbance Report April 2004 Observers: A100 A102 A103 A108 A29 A50 A52 A63 A80 A84 A87 A91 A93 A95 A97 A99 YYMMDD Event Peak Importance 040401 1713 2 040404 1624 2 040405 0554 1+ 040406 0536 1+ 040406 1324 2+ 040406 1331 2+ 040408 0149 1 040408 1018 2+ 040408 1320 2+ 040411 0419 1- 040412 0750 1+ 040415 1644 2 040416 1442 1 040419 0034 1- 040419 1834 2+ 040421 0304 2+ 040421 1454 1+ 040421 1500 1+ 040421 1617 2 040422 0221 1+ 040422 1415 2 040422 1451 1- 040423 0456 1 040423 0655 2+ 040423 0757 2+ 040423 0931 1- 040423 0950 1 040423 1045 1- 040423 1149 1+ 040423 1204 1 040423 1605 2+ 040423 1608 1+ 040423 1724 2 040423 1733 2 040423 1906 1 040423 2110 2 040423 2256 1+ 040424 0209 1 040424 0551 1 040424 0904 2 040424 1302 1+ 040424 1404 1+ 040424 1528 1+ 040425 0146 1+ 040425 0537 2 040425 1016 1 040425 1614 2 040426 0251 2 040427 0722 2+ 040430 0547 1 ************************************************** Importance Summary - Apr 2004 1- events: 5 1 events: 10 1+ events: 13 2 events: 12 2+ events: 10 3 events: 0 3+ events: 0 ------------------ Total events: 50