AAVSO Sudden Ionospheric Disturbance Report April 2015 Observers: A118 A119 A122 A125 A131 A134 A136 A138 A139 A141 A142 A143 A94 A96 A97 YYMMDD Event Peak Importance 150402 0534 2+ A122 - XRA 150403 0637 3 A141 - QUAL 150408 0805 1 A141 - QUAL 150408 1444 2 150409 0635 1+ 150409 0805 2+ A134 - QUAL 150409 1014 1- 150409 1722 2 150409 1728 2+ A94 - XRA 150409 1859 1+ 150409 2346 1+ A134 - XRA 150410 0804 2 150410 0810 1- A139 - XRA 150410 0942 1- A139 - XRA 150410 0946 2 150410 0959 2+ 150410 1928 1 A94 - XRA 150411 0240 2+ 150411 1625 1+ A118 - XRA 150411 1748 2+ A125 - XRA 150412 0029 1+ 150412 0127 1+ A134 - XRA 150412 0818 1+ 150412 0926 2 150412 0943 3 150412 0955 3+ 150412 1127 1- 150412 1445 1- 150412 1515 1- 150412 1719 1 150412 1805 1 150412 1939 1 150412 2122 1- A125 - XRA 150412 2231 1- A125 - XRA 150412 2328 1+ 150413 0555 3 A141 - QUAL 150413 0640 1- A131 - XRA 150413 0732 1- A131 - XRA 150413 0759 2+ A141 - FLA 150413 0829 1+ 150413 0837 1- 150413 1012 1- 150413 1136 1 150413 2325 1+ A134 - XRA 150414 1001 1- A139 - QUAL 150415 1141 2 150415 1148 1- 150415 1342 3 150415 2023 2 150416 0137 3 A122 - QUAL 150416 0908 1 150416 1123 1 150416 1309 1 A143 - QUAL 150416 1625 1+ A118 - XRA 150416 1918 1+ 150417 0427 1- A141 - QUAL 150417 0934 1- 150417 1040 2 A141 - QUAL 150417 1601 1 A125 - FLA 150418 1336 1+ 150418 1414 2 150418 1422 2 150418 1815 2+ 150418 1821 1+ 150418 1838 3+ A125 - XRA 150418 2129 1- A125 - XRA 150418 2130 1- A125 - XRA 150419 1600 1 150421 0720 2 150421 1000 1- 150421 1025 2+ 150421 1038 2+ 150421 1050 3 150421 1144 3 150421 1157 2 150421 1542 2+ 150421 1547 2 150421 1701 1+ 150421 2102 1+ 150421 2146 1+ 150421 2214 1+ A125 - XRA 150422 0115 2+ A122 - XRA 150422 0325 3 A122 - XRA 150422 0611 1 150422 0710 1 150422 0808 1+ 150422 0842 2 150422 0854 2+ 150422 1215 1- A118 - XRA 150422 1216 1 150422 1253 3 A141 - QUAL 150423 0214 2 A134 - XRA 150423 0329 2 A122 - XRA 150423 0745 2 150423 0922 2 150423 0935 3+ 150423 0947 3 150423 0953 3 150423 1205 1+ 150423 1520 1 150423 1750 2+ A125 - XRA 150423 2004 1+ 150424 0234 1- A141 - QUAL 150424 0843 1- 150424 2154 1- 150424 2301 1- 150425 1824 2+ A141 - QUAL 150425 2142 1- A141 - QUAL 150425 2142 1- A141 - QUAL 150426 1301 2 A125 - XRA 150426 1308 1 A125 - XRA 150427 1344 2 150428 1322 1- ************************************************** Importance Summary - Apr 2015 1- events: 27 1 events: 16 1+ events: 21 2 events: 20 2+ events: 15 3 events: 11 3+ events: 3 ------------------ Total events: 113