AAVSO Sudden Ionospheric Disturbance Report February 2025 Observers: A118 A119 A131 A136 A138 A141 A148 A150 A153 A96 A97 YYMMDD Event Peak Importance 250201 1133 1- A118 - XRA 250201 1317 1+ A141 - XRA 250201 1318 1+ 250202 1012 2 250202 1203 1 250202 1222 2 A96 - QUAL 250202 1250 1+ 250202 1405 1+ 250202 1514 1- 250202 1530 1+ 250202 1921 1- A148 - XRA 250202 1944 2 250202 1945 2 250202 2046 1- A148 - XRA 250202 2115 1- 250202 2252 1- A148 - XRA 250202 2324 1+ A148 - XRA 250202 2336 2+ A138 - XRA 250203 0742 1- A136 - XRA 250203 0913 1- 250203 1103 1- A118 - XRA 250203 1136 2+ A96 - XRA 250203 1147 1 250203 1244 1- A118 - XRA 250203 1316 2+ 250203 1547 1- A118 - XRA 250203 1721 1+ A141 - XRA 250203 1732 2+ A148 - XRA 250203 1836 2 250203 1904 1 A153 - XRA 250203 2043 1 A148 - XRA 250203 2112 1+ 250203 2137 1- 250203 2331 2 A138 - XRA 250204 0827 1+ A118 - XRA 250204 0847 1- A131 - XRA 250204 1036 1+ 250204 1123 2 250204 1253 2+ A96 - QUAL 250204 1312 2 250204 1345 1 250204 1448 1- 250204 1753 1 A97 - XRA 250204 2112 1 A148 - XRA 250205 0750 1 A136 - XRA 250205 1154 1- 250205 1227 1+ A118 - FLA 250205 1403 1- 250205 1520 1+ 250205 1623 1 A97 - XRA 250205 1727 2 A97 - XRA 250205 1829 1- 250206 1102 2+ 250206 1312 1- 250206 1431 1+ 250206 1612 1- A97 - QUAL 250206 1652 1- A97 - XRA 250206 1832 1- A97 - XRA 250206 1940 1- 250206 2236 2 A138 - XRA 250206 2326 2 A138 - XRA 250207 0913 2+ 250207 1213 1 250207 1747 1- A97 - XRA 250208 0925 2+ 250208 1102 1- 250208 1254 1- 250208 1552 1- 250208 1829 1- A97 - XRA 250208 2015 1- A148 - XRA 250209 1411 1 250209 2025 1- 250209 2058 1- A148 - XRA 250210 1113 1 A118 - XRA 250210 1235 1- A118 - XRA 250211 1346 2+ 250211 1406 2+ 250211 1523 1- A97 - XRA 250211 1820 1+ 250212 1247 1 A118 - XRA 250213 1009 1- 250213 1109 1- 250213 1210 1- A118 - XRA 250213 1238 1- A118 - XRA 250213 1853 1 A97 - XRA 250214 1003 2 250214 1417 1- 250214 2055 1 250216 1839 1+ 250217 1151 1+ 250217 1342 1- 250217 1454 1- 250217 1512 1 250217 1557 1 250218 0748 1- 250218 1718 1- 250219 1016 1+ 250219 1047 1- A118 - XRA 250219 1150 1- A118 - QUAL 250220 1409 1- A97 - XRA 250220 1502 1- 250221 0809 1+ 250221 1120 1- 250221 1214 2 250221 1436 1 250221 1606 1 250221 1900 1- 250221 1918 3+ A138 - QUAL 250221 1951 1+ 250221 2011 3+ A138 - QUAL 250221 2249 1- 250222 1645 1- 250222 1735 1 A97 - XRA 250222 1830 1- A97 - XRA 250222 1846 1 250222 2006 1- A97 - XRA 250222 2020 1- A148 - XRA 250222 2038 1- A138 - XRA 250222 2100 1+ 250222 2110 1+ 250222 2155 1- 250223 0914 1 250223 0957 1+ 250223 1155 2+ 250223 1225 1 250223 1250 1- 250223 1402 1- 250223 1512 1- 250223 1630 1+ 250223 1719 1 250223 1910 1 250223 1924 1+ 250223 1940 2+ 250223 2141 1+ 250224 0702 1 250224 1143 2 250224 1235 2+ A119 - QUAL 250224 1312 2 250224 1319 2+ 250224 2059 1+ 250224 2136 1- 250224 2205 2+ A153 - QUAL 250224 2219 2+ A138 - QUAL 250224 2230 3 A148 - QUAL 250225 1133 3 250225 1158 3 A131 - XRA 250225 1759 1- A150 - XRA 250225 1810 1- A150 - XRA 250226 1156 2 A118 - XRA 250226 1239 1 A118 - XRA 250226 1849 2 250227 1234 2 250227 1508 1+ 250228 1017 1 250228 1311 1 250228 1627 1- 250228 1924 1- 250228 1925 1 ************************************************** Importance Summary - Feb 2025 1- events: 62 1 events: 30 1+ events: 27 2 events: 18 2+ events: 16 3 events: 3 3+ events: 2 ------------------ Total events: 158