AAVSO Sudden Ionospheric Disturbance Report May 2023 Observers: A118 A119 A122 A131 A136 A138 A141 A146 A148 A150 A152 A153 A96 A97 YYMMDD Event Peak Importance 230501 0121 1+ A153 - XRA 230501 0708 1 230501 0747 1 230501 1115 2 A118 - XRA 230501 1159 1- 230501 1309 2 230501 1311 2+ 230501 1432 1+ 230501 1435 2 230501 1740 2+ A148 - XRA 230501 2210 3 A122 - XRA 230501 2229 2 230502 1733 1 230502 1820 2 230503 0734 2+ 230503 0927 2 230503 1004 2 A141 - XRA 230503 1013 1 230503 1044 2 230503 1211 1- 230503 1235 2 230503 1350 2 230503 1352 2 230503 1459 1- A150 - XRA 230503 1825 1 A97 - XRA 230503 2053 1 230504 0507 2 A131 - XRA 230504 0829 2+ 230504 0838 3+ 230504 1435 1 A97 - XRA 230504 1606 2 A97 - XRA 230504 1847 2+ 230504 1909 1+ A150 - QUAL 230505 0223 2+ A122 - QUAL 230505 0536 2+ A131 - XRA 230505 0706 1 230505 0742 2 230505 0753 3+ 230505 1532 2+ 230505 1542 2 230505 2228 2 230506 0047 1+ A122 - XRA 230506 1459 1 230506 1527 3+ A148 - QUAL 230506 1746 1- 230506 2156 2+ 230506 2301 2+ A122 - QUAL 230507 1631 1- A146 - QUAL 230507 1755 1- A146 - QUAL 230507 2103 1- A153 - XRA 230507 2227 2+ 230507 2315 2+ A153 - XRA 230508 0028 2+ A122 - QUAL 230508 0226 3 A153 - XRA 230508 0308 2+ A122 - QUAL 230508 0648 1 A136 - XRA 230508 0840 2 230508 1000 1+ 230508 1020 2 A118 - QUAL 230508 1420 2 230508 1612 2 A136 - XRA 230508 2025 2+ 230508 2238 1+ A122 - XRA 230509 0352 3 A122 - XRA 230509 0358 2+ A131 - XRA 230509 0614 2 230509 0811 1+ 230509 0928 1+ 230509 1016 2 230509 1117 1+ 230509 1215 2+ A118 - QUAL 230509 1228 1 A152 - XRA 230509 1405 1 230509 1440 2 230509 1754 2+ A153 - XRA 230509 1841 2+ 230509 1854 2+ 230509 2048 2 230509 2241 2 A122 - QUAL 230510 0411 1- A131 - XRA 230510 1420 2 230510 1502 1- 230510 1842 1- A153 - XRA 230510 1936 1+ 230510 2000 1 230510 2218 2 230511 0857 2+ 230511 1108 1+ A131 - QUAL 230511 1402 1+ 230511 1436 1- A152 - QUAL 230511 1829 2 230512 0822 1 230512 1139 2 230512 1258 1 230512 1335 1+ 230512 1409 1- 230512 1505 1- A138 - FLA 230512 1528 1+ A136 - XRA 230512 2340 1+ A153 - QUAL 230513 1028 1+ 230513 1310 1- A131 - QUAL 230513 1351 1 A131 - XRA 230513 1454 1+ 230513 1847 1+ 230513 2056 1 230514 0918 2 230515 0743 2 230515 0755 3 230516 0956 1 230516 1214 2 230516 1256 1- A118 - QUAL 230516 1641 2+ 230516 2145 2 A153 - XRA 230516 2234 2+ A153 - XRA 230517 1443 1+ 230517 1528 1+ 230517 1537 1+ 230517 1626 1+ 230517 1633 1+ 230517 1845 1+ 230517 1937 2 230517 2148 2 230518 0325 3+ A122 - XRA 230518 0626 1 230518 0655 1+ 230518 1006 1 230518 1019 2 230518 1104 1- 230518 1125 1- 230518 1145 1 230518 1213 2 230518 1247 1+ 230518 1254 2+ 230518 1334 1- A131 - FLA 230518 1356 1 230518 1553 1+ 230518 1749 1+ 230518 2028 2 230518 2104 1+ 230518 2301 2+ A122 - QUAL 230519 0014 1 A153 - XRA 230519 0047 3 A153 - XRA 230519 0205 1+ A122 - FLA 230519 0440 3+ A122 - XRA 230519 0500 2 230519 0650 1 230519 0746 2 230519 0930 1- 230519 1016 2+ 230519 1233 2+ 230519 1239 2 230519 1534 1- A153 - XRA 230519 1630 2 230519 1721 1+ 230519 1729 1+ 230519 1916 1 230519 1952 2 230519 2005 2 230519 2026 2 230519 2301 3+ A122 - FLA 230520 0047 3 A122 - XRA 230520 0452 2 A131 - XRA 230520 0702 1 230520 0730 2 230520 0856 1 A152 - FLA 230520 0925 1+ 230520 1054 2 230520 1233 2 230520 1425 1+ 230520 1459 2 230520 1618 1 230520 1654 1- A153 - XRA 230520 1705 1- A153 - XRA 230520 1743 1- A153 - XRA 230520 1809 1- A153 - XRA 230520 1854 1 230520 1903 2 230520 1951 2+ 230520 2017 1+ 230520 2101 1 A153 - XRA 230520 2306 2+ 230521 0223 1+ 230521 0540 1+ A118 - XRA 230521 0558 2+ A122 - FLA 230521 0647 1- 230521 0800 2 230521 0837 2+ 230521 0956 2+ 230521 1053 2 A118 - QUAL 230521 1102 2 A131 - QUAL 230521 1129 1+ 230521 1516 1 230521 1603 2+ 230521 2108 1+ 230521 2136 3 A141 - QUAL 230521 2153 2 230522 0106 2 A153 - XRA 230522 0226 3+ A122 - XRA 230522 0457 1 A131 - XRA 230522 0612 1 230522 0957 2 A131 - FLA 230522 1126 1- A131 - QUAL 230522 1327 1- 230522 1336 2 230522 1414 1 230522 1839 1- A153 - XRA 230523 0717 2 A131 - XRA 230523 1012 3+ A118 - XRA 230523 1043 1+ 230523 1213 2 230523 1437 1- 230523 1533 1- 230523 1610 1 A97 - XRA 230523 1636 1+ 230524 0835 2+ 230524 0959 1+ 230524 1027 1 230524 1720 2 230524 1756 2+ 230524 1803 2 230524 1909 1+ 230524 1956 1+ A138 - XRA 230525 0449 1- A131 - XRA 230525 0541 1+ 230525 1111 2 230525 1311 1+ 230525 1444 2 230525 1703 1 A97 - FLA 230526 1404 1+ A118 - XRA 230526 1704 1 230526 1754 2 230526 1858 1 A153 - XRA 230526 2241 2+ 230526 2303 2+ 230527 1525 2 A118 - XRA 230527 1923 1+ 230528 1036 2 230529 1829 2 230530 0021 2+ A153 - XRA 230530 0808 2 230530 0852 2+ A119 - QUAL 230530 1022 2 230530 1339 2 230530 1634 1 230530 1647 2 230530 1651 2 230531 0000 1- A141 - QUAL 230531 0102 2+ A153 - XRA 230531 0208 1+ A153 - XRA 230531 0446 2 230531 0527 1+ 230531 0610 1+ 230531 0743 1+ 230531 0831 1+ 230531 1103 1+ 230531 1208 1 A131 - QUAL 230531 1224 1 230531 1347 1+ 230531 1649 1- A153 - XRA 230531 2010 1+ 230531 2046 2 230531 2202 1+ 230531 2249 3 ************************************************** Importance Summary - May 2023 1- events: 33 1 events: 42 1+ events: 57 2 events: 75 2+ events: 40 3 events: 8 3+ events: 8 ------------------ Total events: 263