AAVSO Sudden Ionospheric Disturbance Report April 1992 Observers: A-03 A-09 A-40 A-50 A-52 A-59 A-61 A-62 A-63 A-64 A-65 A-66 A-67 A-68 A-69 A-70 A-71 A-72 A-73 A-74 YYMMDD Event Peak (UT) Importance 920401 0054 2 920401 0823 2+ 920401 1017 2 920401 1056 1 920401 1412 1 920401 1527 1- 920401 1738 3 920401 2159 1 920401 2230 1 920401 2323 1 920402 0844 1- 920402 1033 1- 920402 2306 1 920402 2331 2 920402 2354 1 920403 0458 2 920403 0644 1+ 920403 1149 1- 920403 1204 1 920403 1224 1 920403 1309 1- 920403 1536 1- 920403 1741 2 920404 0045 1+ 920404 1055 1 920404 1432 2 920404 1811 1 920404 1811 1 920404 1926 1+ 920405 0115 2 920405 0258 1 920405 1115 1- 920405 1312 1 920405 1501 1- 920405 1530 1- 920405 1652 1- 920405 1700 2 920405 1834 1- 920405 2014 1- 920405 2036 1- 920405 2324 2+ 920406 0744 2+ 920406 1050 1- 920406 1418 2 920406 1815 1- 920406 1826 1+ 920406 1900 1+ 920406 2103 1- 920406 2205 3 920407 0017 1 920407 0330 2 920407 0622 1- 920407 0656 1 920407 1533 2 920407 1731 2 920407 2002 1- 920407 2017 1- 920408 0753 2+ 920408 1030 2+ 920408 1132 1- 920408 1312 1 920408 1514 1- 920408 1553 1 920408 1637 1- 920408 1743 1 920408 2144 1+ 920409 0100 1- 920409 0330 1 920409 1044 1- 920409 1550 1- 920409 1628 1 920410 0100 1 920410 0534 2 920410 1508 1 920410 2218 1 920411 0044 1- 920411 2048 1 920412 0029 1+ 920412 1529 1 920413 0037 1 920413 1108 1- 920413 1324 1- 920414 0130 1- 920414 0620 1- 920414 1349 1- 920414 1957 1 920415 1143 1 920415 1249 1+ 920415 1714 1 920415 1810 1- 920415 2111 1- 920415 2145 2 920416 1721 1 920416 1752 1- 920416 1830 2 920416 2007 2 920417 0001 1- 920417 1022 1+ 920417 1156 1+ 920417 1238 1- 920417 1317 1- 920417 1737 2 920417 1826 2+ 920417 2019 2 920417 2154 2 920417 2316 1- 920417 2330 1- 920417 2345 1- 920418 1044 1- 920418 1156 2+ 920418 1405 1+ 920418 1450 1- 920418 1700 1- 920418 1731 2+ 920418 1947 1 920418 2027 1- 920418 2059 1- 920419 0647 1- 920419 0841 1+ 920419 1055 2 920419 1131 1 920419 1335 1- 920419 1347 1- 920419 1405 1 920419 1539 1- 920419 1623 2 920419 1711 1- 920419 1729 1+ 920419 1805 1+ 920419 1944 2 920419 2315 2 920420 0528 2 920420 0632 1- 920420 0758 1- 920420 0824 1+ 920420 0914 1- 920420 0931 1 920420 1145 2+ 920420 1223 1 920420 1508 1- 920420 1613 1 920420 1701 1- 920420 1825 1- 920420 1835 1 920420 1900 2 920420 2048 2+ 920420 2214 1 920421 0535 1 920421 0731 1- 920421 0929 2 920421 1014 1- 920421 1116 1+ 920421 1323 1+ 920421 1647 2+ 920422 0109 2+ 920422 1324 1 920422 1624 1 920423 0231 2 920423 0936 1- 920423 1146 1- 920423 1346 1- 920423 1651 1- 920423 1702 1 920423 1816 1- 920423 1921 1- 920423 1946 1+ 920423 2148 1+ 920424 0044 1 920424 0214 1- 920424 0615 1 920424 0708 1 920424 0915 1- 920424 0920 1+ 920424 1248 2 920424 1552 1- 920424 1832 1- 920424 1919 1+ 920424 1945 1- 920424 2004 1- 920425 1328 1+ 920425 1529 1- 920425 1815 1 920425 1842 1 920426 0356 1 920426 1515 2+ 920426 1714 1 920426 1815 1- 920426 1828 1 920427 0546 1- 920427 1518 1 920427 2032 1- 920427 2151 1- 920428 0816 1- 920428 1506 1 920428 1746 1- 920429 0607 1 920429 1029 1- 920429 1318 1- 920429 1507 2 920429 1722 1- 920429 1934 1 920430 0621 1- 920420 1346 1- 920430 2305 1- ******************************************* Importance Summary April 1992 1- events: 83 1 events: 55 1+ events: 22 2 events: 29 2+ events: 13 3 events: 2 3+ events: 0 Total events: 204