AAVSO Sudden Ionospheric Disturbance Report April 2017 Observers: A118 A119 A120 A122 A131 A134 A136 A138 A141 A142 A143 A146 A147 A149 A96 A97 YYMMDD Event Peak Importance 170401 0356 2+ A122 - XRA 170401 1037 1- 170401 1956 2 170401 2145 2 170401 2155 2+ 170401 2159 1 170401 2304 2+ A134 - XRA 170401 2310 1- A138 - XRA 170402 0247 2+ 170402 0758 3 170402 0807 3 170402 1044 2 A141 - QUAL 170402 1058 2 170402 1259 2+ 170402 1309 3 170402 1452 1+ A141 - QUAL 170402 1508 2 170402 1627 1+ 170402 1647 2 A147 - QUAL 170402 1831 2 170402 1905 3 A147 - FLA 170402 2030 1+ 170402 2031 1+ 170402 2049 2+ A147 - QUAL 170402 2110 1+ 170403 0107 1+ A141 - XRA 170403 0504 1- 170403 0514 1- 170403 0623 1- 170403 0642 2 170403 0652 2 170403 0817 2 170403 0859 1- A131 - QUAL 170403 0919 1+ 170403 1034 2+ 170403 1056 1- A131 - QUAL 170403 1114 1+ 170403 1144 1 170403 1218 1- 170403 1307 1- 170403 1324 1+ 170403 1333 1- A149 - XRA 170403 1342 1 A97 - QUAL 170403 1426 2+ 170403 1435 2 170403 1701 1 A97 - FLA 170403 1912 1- A141 - XRA 170403 1913 1 A141 - XRA 170403 1925 1- A97 - XRA 170403 2017 1+ 170403 2136 1- A97 - QUAL 170404 0710 1 170404 0952 1+ 170404 1148 1+ A119 - XRA 170404 1217 1+ 170404 1342 2 170404 1702 1- A146 - XRA 170404 1957 2 A147 - XRA 170404 2343 1 170405 0936 1 170406 0013 1- A134 - QUAL 170406 1027 1 170406 1209 1+ 170406 1715 1 A147 - XRA 170407 0026 2+ 170407 0857 1+ 170407 1951 1 170408 0310 3 A134 - XRA 170408 0906 2 170417 0247 2+ A122 - XRA 170417 0721 2 A122 - XRA 170418 0939 2+ 170418 0947 2 170418 2005 2+ 170421 0800 3+ A142 - QUAL 170423 1645 2 A141 - QUAL 170423 1645 2 A141 - QUAL 170425 2033 1+ A147 - XRA 170425 2033 1+ A147 - XRA 170426 1725 3 A141 - QUAL 170428 1808 3 A141 - QUAL ************************************************** Importance Summary - Apr 2017 1- events: 15 1 events: 11 1+ events: 17 2 events: 18 2+ events: 12 3 events: 7 3+ events: 1 ------------------ Total events: 81