AAVSO Sudden Ionospheric Disturbance Report May 2025 Observers: A118 A119 A131 A136 A141 A148 A150 A152 A153 A154 A96 A97 YYMMDD Event Peak Importance 250501 0719 1+ 250501 1648 1- A97 - XRA 250502 2143 1 250503 1410 1 250503 1601 1 250504 1008 1- A118 - XRA 250504 1134 1 250504 1232 1+ 250504 1614 1+ A136 - XRA 250504 1630 1 A97 - XRA 250505 1843 1 A148 - XRA 250506 1051 1 A136 - XRA 250506 1151 1 A136 - XRA 250506 1623 1- 250506 1708 1 250506 1817 1- A97 - XRA 250506 1920 1- A97 - XRA 250506 1929 1 A148 - XRA 250506 2032 1- 250507 1211 1- A148 - XRA 250507 1751 1+ 250507 1906 1+ 250508 0652 1+ A96 - XRA 250508 0709 2 250508 1142 2 250508 1357 1 250508 1503 2 250509 1121 1+ 250509 1948 2+ A150 - QUAL 250510 1103 2 A150 - XRA 250510 1236 1+ A97 - XRA 250510 1254 1- A97 - XRA 250510 1620 1 250510 1631 1 A97 - XRA 250511 0744 1 A118 - XRA 250511 1112 1+ 250511 1127 1 250511 1420 1 A97 - XRA 250511 1505 1 250511 1617 1 250511 1822 1- A97 - XRA 250512 1306 2+ 250512 1502 1- 250512 1707 1- A118 - XRA 250512 1950 1 A148 - XRA 250513 1357 1 250513 1536 2+ 250513 1537 2+ 250513 1554 2+ A96 - FLA 250514 0717 1+ A118 - XRA 250514 0727 1 A152 - XRA 250514 0745 1+ 250514 0816 3 250514 0823 2+ 250514 1115 2+ 250514 1121 1+ 250514 1654 1 A148 - XRA 250514 1810 2 250515 1527 1+ 250515 1721 2 250515 1831 3+ A97 - QUAL 250515 2219 1 250516 0948 2+ A96 - QUAL 250518 2222 1- A148 - XRA 250519 0822 2 250520 0554 1+ 250520 1021 2 A136 - XRA 250520 1311 1+ 250520 1652 1 A97 - XRA 250520 2226 1 250521 1631 2+ A150 - QUAL 250521 1735 2 A150 - QUAL 250521 1824 2+ A150 - QUAL 250521 2015 2+ A150 - XRA 250522 1205 2 A152 - FLA 250522 1229 2+ A150 - XRA 250522 1414 2+ A150 - QUAL 250522 1614 2+ A150 - QUAL 250522 1813 2+ A150 - QUAL 250523 1242 2+ A150 - QUAL 250523 1448 2+ A150 - QUAL 250523 1655 2 A150 - QUAL 250524 0611 1 250524 1033 2 250524 1212 1+ A150 - QUAL 250524 1245 2 250524 1542 1 A97 - XRA 250524 1615 1 250524 1652 1+ 250524 1749 2+ A153 - FLA 250524 1953 3 A150 - QUAL 250524 2024 2 250524 2353 1- 250525 0636 2 250525 0750 2 250525 0949 2+ A150 - XRA 250525 1016 2 250525 1505 2+ A150 - QUAL 250525 1558 2+ A150 - FLA 250525 1632 2+ 250525 1806 3+ A148 - QUAL 250525 1940 2 A148 - XRA 250525 2302 1- A148 - XRA 250526 0715 2 250526 1235 1+ A150 - QUAL 250526 1306 1+ 250526 1336 2 250526 2251 2 250527 1012 1 250528 1039 3+ A154 - XRA 250528 1046 1- A96 - XRA 250528 1149 1- 250528 1630 2 250530 0612 2+ 250530 1056 2 250530 1114 2 A96 - QUAL 250530 1801 3 A150 - QUAL 250530 1835 2 250530 2356 1+ 250531 0355 3+ A154 - XRA 250531 0518 1+ 250531 0705 1- A118 - XRA 250531 0728 1+ 250531 0820 2 250531 1015 2 250531 1329 1 250531 1516 2+ A150 - QUAL 250531 1547 3 250531 1548 2 250531 1553 2+ 250531 1822 1+ A148 - XRA 250531 1822 1+ A148 - XRA 250531 1835 1+ A150 - XRA 250531 1835 1+ A150 - XRA 250531 1907 2 A148 - XRA 250531 1913 1- A97 - XRA 250531 2238 1 A148 - XRA 250531 2238 1 A148 - XRA ************************************************** Importance Summary - May 2025 1- events: 18 1 events: 32 1+ events: 26 2 events: 29 2+ events: 25 3 events: 4 3+ events: 4 ------------------ Total events: 138