AAVSO Sudden Ionospheric Disturbance Report May 2012 Observers: A102 A118 A119 A120 A122 A124 A125 A129 A131 A132 A133 A80 A94 A97 YYMMDD Event Peak Importance 120501 0447 1 120501 2301 1+ A122 - XRA 120502 1140 2 120502 1441 1- A131 - XRA 120502 1803 1 120502 1903 1 120502 2051 1+ A94 - XRA 120503 1105 2 A80 - XRA 120503 1142 1- A132 - FLA 120503 1432 3 A80 - XRA 120503 1649 2 120503 1656 2 120504 1451 2 120504 1545 2+ A118 - QUAL 120504 1805 1 A80 - QUAL 120504 1903 1- A80 - QUAL 120505 0838 1+ 120505 0845 1+ A132 - XRA 120505 0936 1+ 120505 1100 1 120505 1212 1- A132 - QUAL 120505 1317 1- 120505 1324 2 120505 1649 1- 120505 1722 1- 120506 0111 2+ A122 - XRA 120506 0121 2 A133 - XRA 120506 0251 1- A122 - XRA 120506 0329 1+ A122 - XRA 120506 0440 1- 120506 0704 1- 120506 1141 1 120506 1343 1 120506 1624 1- 120506 1653 1- 120506 1710 1 120506 1747 1+ 120507 0254 2 120507 0704 1 120507 0731 1+ A119 - QUAL 120507 1109 1+ 120507 1135 2+ A80 - QUAL 120507 1414 3 120507 1427 2+ 120507 1726 2 120508 0835 1 120508 0928 1 120508 1040 1- 120508 1300 2 120508 1309 2 120509 0417 1- A122 - XRA 120509 0843 1- 120509 0950 1- 120509 1141 1- A131 - XRA 120509 1230 2 120509 1250 2+ A129 - QUAL 120509 1409 2 120509 1642 1- 120509 1902 1+ A129 - QUAL 120509 2102 2 120510 0050 1- A122 - XRA 120510 0146 1 120510 0212 1- A122 - XRA 120510 0419 1+ 120510 0448 1- A133 - QUAL 120510 0511 1- 120510 0522 1 120510 0601 1- 120510 0624 1 120510 0735 1- 120510 1035 1 A80 - XRA 120510 1215 1- A80 - XRA 120510 1238 1 120510 1315 1+ 120510 1341 1 120510 1356 1 120510 1414 1- A124 - QUAL 120510 1424 2 A124 - QUAL 120510 1659 1+ 120510 1746 1 120510 1849 2+ A124 - QUAL 120510 1919 1 A80 - XRA 120510 2028 1- 120511 0525 1- A131 - XRA 120511 0746 1- 120511 0816 1- 120511 0837 1+ 120511 0912 1+ 120511 0946 1 120511 1017 1- 120511 1040 1- 120511 1216 1- A80 - XRA 120511 1305 2 120511 1314 1+ 120511 1423 1- 120511 1716 3+ A125 - XRA 120511 1738 1+ 120511 2015 2+ A125 - XRA 120512 0435 1+ A122 - XRA 120512 0521 1 A131 - XRA 120512 0655 1- 120512 0715 1- 120512 0924 1 120512 1248 1- 120512 1325 1+ 120513 0200 1- A122 - XRA 120513 0407 1 120513 0814 2 120514 0036 1- A122 - XRA 120514 0720 1- A131 - QUAL 120514 0738 2 120514 0942 1 120514 1339 1- 120514 1616 1+ 120514 1736 1- A124 - QUAL 120514 1925 1- A80 - XRA 120514 1956 1- A124 - QUAL 120515 0947 1+ 120515 1939 2+ A125 - XRA 120515 2217 1+ A94 - QUAL 120516 0919 1+ 120516 1125 1- A80 - QUAL 120516 1226 1- 120517 0140 3 A122 - XRA 120517 0146 3+ A133 - XRA 120517 1155 1- A80 - XRA 120517 1901 2+ A80 - XRA 120517 1908 2+ A132 - XRA 120518 0812 2+ 120518 1312 1+ 120518 1345 1+ 120518 1500 2 120518 1553 1+ 120518 1900 2+ A80 - XRA 120520 1327 2+ A125 - FLA 120520 1428 2 A132 - QUAL 120521 0950 2 A132 - QUAL 120523 1256 2 A132 - QUAL 120524 1140 1+ 120524 1609 1- A125 - XRA 120524 1847 1- 120524 1944 1- A125 - FLA 120524 2011 2+ A125 - XRA 120524 2107 1+ 120525 1014 1 120525 1103 1- 120525 1555 1- 120525 1958 1- A80 - XRA 120526 0139 2 A122 - XRA 120526 0914 1 120526 1610 1 120526 2301 2+ A122 - XRA 120527 0304 1- A122 - XRA 120528 0531 1- A122 - XRA 120528 1155 1 A132 - XRA 120528 1300 1 A132 - XRA 120529 0500 2+ A122 - XRA 120530 0844 2 120530 0905 2+ A132 - XRA 120531 1242 1+ A132 - QUAL 120531 1336 2 120531 1412 1- A118 - QUAL 120531 1431 2 120531 1505 1 A118 - QUAL 120531 1536 1+ ************************************************** Importance Summary - May 2012 1- events: 56 1 events: 31 1+ events: 30 2 events: 26 2+ events: 17 3 events: 3 3+ events: 2 ------------------ Total events: 165