AAVSO Sudden Ionospheric Disturbance Report April 1993 Observers: A-09 A-40 A-50 A-59 A-61 A-62 A-63 A-65 A-66 A-67 A-68 A-69 A-70 A-71 A-72 A-73 A-74 A-75 A-76 A-77 A-78 A-79 A-80 A-81 YYMMDD Event Peak (UT) Importance 930401 0432 2 930401 1547 1- 930401 1639 1+ 930401 1706 1- 930402 1512 2 930402 1824 2+ 930402 1913 1- 930402 2050 1+ 930402 2130 2+ 930403 0708 1 930405 0015 1+ 930405 1645 2 930405 1959 2 930405 2058 1- 930405 2216 1- 930406 0243 1 930406 1155 2+ 930406 1850 1 930406 2115 1- 930406 2215 1 930406 2247 1 930406 2345 1 930407 0300 1- 930407 0616 1- 930407 0943 1 930407 1045 1- 930407 1153 1 930407 1243 2+ 930407 1343 1- 930407 1402 2 930407 1522 1- 930408 0320 1+ 930408 1528 1+ 930408 1610 1+ 930408 1943 1- 930408 2000 2+ 930408 2045 2+ 930408 2130 1- 930409 1117 1- 930409 1742 2+ 930409 2125 1 930410 1515 1 930410 1642 1 930410 1735 1- 930410 1747 2+ 930410 1946 2+ 930410 2121 1 930410 2333 1 930411 0029 2 930411 0614 1 930411 1203 1- 930411 1731 1 930412 1138 1- 930412 1608 1- 930412 1810 1- 930413 0658 1- 930413 2029 1- 930415 0908 2 930415 1100 1- 930415 1503 1- 930416 1243 1- 930416 1740 1 930416 1927 1- 930416 1945 1 930416 2009 2 930416 2107 1- 930417 0030 1- 930417 0206 1- 930417 1015 1- 930417 1345 1 930417 1722 1+ 930418 0659 1- 930418 0912 2+ 930418 1820 1+ 930418 1912 2+ 930418 2220 1 930419 0007 2 930419 0508 1+ 930419 0605 1- 930419 1432 1 930419 1915 2 930419 2045 1 930420 0939 1+ 930420 1030 1- 930420 1253 1 930420 1519 1- 930420 1750 2 930420 1931 1- 930420 2110 1- 930421 0722 1 930421 1433 2 930422 1410 2 930422 1947 1 930424 1540 1 930425 0245 1 930425 0811 1- 930425 1227 1 930425 2136 2 930426 1206 1- 930430 1752 2 ******************************************* Importance Summary April 1993 1- events: 37 1 events: 27 1+ events: 10 2 events: 15 2+ events: 11 3 events: 0 3+ events: 0 Total events: 100