AAVSO Sudden Ionospheric Disturbance Report April 2013 Observers: A102 A118 A119 A120 A122 A125 A129 A131 A132 A134 A136 A137 A139 A140 A141 A94 A96 A97 YYMMDD Event Peak Importance 130401 1253 1 A125 - QUAL 130401 1959 2 A125 - QUAL 130401 2347 1- A125 - XRA 130402 0059 1- A137 - XRA 130402 0207 1- A137 - QUAL 130402 0242 1- A137 - XRA 130402 1504 1- 130403 0018 1- A137 - QUAL 130403 0039 1- A137 - QUAL 130403 0155 1- A137 - QUAL 130403 0244 1- A137 - QUAL 130403 0550 1- A137 - QUAL 130403 0624 1- A137 - QUAL 130403 0945 1+ 130403 1725 1- A139 - XRA 130403 1820 1- 130403 1842 1+ 130403 2235 1- A137 - QUAL 130404 0953 1- 130405 0700 1- A122 - XRA 130405 0940 1- A139 - QUAL 130405 1746 2 130405 1758 2+ 130406 0552 2 A129 - XRA 130406 0802 1- A122 - XRA 130406 0811 2 A134 - XRA 130406 0840 1- A139 - QUAL 130406 0946 1 130406 1138 2 130406 1227 1- 130406 1943 1+ 130406 2129 2 130406 2156 1- A125 - QUAL 130407 1145 1- A139 - QUAL 130407 1211 1- A125 - QUAL 130407 1602 1 130407 1702 1- 130407 1908 1- A125 - XRA 130407 2132 2 A125 - FLA 130408 0402 1- A122 - XRA 130408 1350 1 A139 - QUAL 130408 1428 1- A125 - XRA 130408 1555 1 A129 - XRA 130409 0725 1- 130409 0734 1 A132 - XRA 130409 0900 1- 130409 1140 2 130409 1150 1 A131 - XRA 130409 1327 1- A125 - XRA 130409 1333 1- A131 - XRA 130409 1445 1 A125 - XRA 130409 1958 2 A94 - XRA 130410 1330 1+ A132 - QUAL 130410 1801 1- 130410 1914 2+ 130410 2223 2 A120 - QUAL 130410 2338 1 A122 - XRA 130411 0554 3 A120 - FLA 130411 0655 1 A125 - FLA 130411 0709 2+ 130411 1014 1- 130411 1039 2 130411 1247 1+ 130411 1401 1- A131 - FLA 130411 2143 2+ A120 - QUAL 130411 2258 1+ 130412 0413 1 130412 0745 1+ A134 - QUAL 130412 1330 1- A141 - QUAL 130412 1848 2 130412 2037 2+ 130413 0335 1+ 130413 0658 2 A134 - QUAL 130413 0928 1- 130413 1700 1+ A125 - QUAL 130413 1954 1 A94 - XRA 130413 2040 1+ 130413 2104 1- A125 - XRA 130414 2057 1+ A125 - XRA 130415 0923 1- A118 - XRA 130415 1112 1- A139 - QUAL 130415 1404 1- 130416 0359 1+ A120 - QUAL 130416 0428 1+ A120 - XRA 130416 0735 1- A118 - XRA 130416 0936 2 A129 - FLA 130417 2014 1- A137 - XRA 130417 2103 1- A137 - XRA 130418 0817 2+ 130418 1712 1 A129 - QUAL 130418 1815 3 A94 - XRA 130418 1821 2+ A97 - XRA 130419 0208 2 A120 - QUAL 130419 1443 1- 130420 0057 2+ A120 - QUAL 130420 0231 1- A122 - XRA 130420 0804 1- 130420 1031 3 A132 - QUAL 130420 1052 1- A139 - QUAL 130420 1703 1- A97 - XRA 130421 0000 3+ A125 - QUAL 130421 0110 1 A134 - XRA 130421 0251 1- A122 - XRA 130421 0602 1 A119 - XRA 130421 0737 1- 130421 0925 1+ 130421 1025 1+ A136 - XRA 130421 1158 1+ A125 - XRA 130421 1421 1- 130421 1604 1- 130421 1747 2 A125 - FLA 130421 1837 1+ 130422 1015 1- 130422 1029 2 130422 2251 1+ 130423 1313 1- A131 - XRA 130423 1331 1 130423 1415 1+ 130423 1501 1- 130423 1507 1- 130423 1518 1 130423 1808 2 A136 - QUAL 130423 1819 1- A139 - XRA 130423 1937 1 A94 - XRA 130424 0328 1- A122 - XRA 130424 1005 1+ 130424 1012 2 130424 1100 1 A118 - QUAL 130424 1124 1 130424 1323 1 130424 1622 2 A139 - QUAL 130424 1659 1+ 130424 1718 1- A139 - QUAL 130424 2143 1 A125 - QUAL 130424 2303 2+ A125 - XRA 130425 0021 1 A122 - XRA 130425 0204 2+ A120 - QUAL 130425 0341 1- A122 - XRA 130425 0832 1+ 130425 0945 1- 130425 1049 2 130425 1102 2 130425 1148 1+ 130425 1435 1- 130425 1618 1- A139 - XRA 130425 1626 1 A119 - XRA 130425 1716 1- 130425 1727 1+ 130425 1804 1- A97 - QUAL 130425 1940 1+ 130425 2146 2 A125 - FLA 130425 2204 2+ A94 - XRA 130426 0000 3+ A125 - QUAL 130426 0407 2+ A120 - QUAL 130426 0603 2+ A120 - QUAL 130426 0627 2 130426 0858 1+ 130426 1257 1+ 130426 1356 1- A125 - QUAL 130426 1538 2 130426 1545 2+ 130426 1714 1- A94 - XRA 130426 1830 1- A94 - XRA 130426 1839 1- A139 - XRA 130426 2123 2 A94 - XRA 130426 2218 2+ A94 - XRA 130427 0150 2 A120 - QUAL 130427 0229 3 A120 - QUAL 130427 0252 2 130427 0356 1 A134 - XRA 130427 0622 1+ 130427 0810 1+ 130427 0918 2 130427 1056 1+ 130427 1213 1+ 130427 1220 2+ 130427 1325 1- A125 - XRA 130427 1347 1+ 130427 1513 1+ 130427 1614 1- A125 - XRA 130428 1257 3+ A141 - QUAL 130428 1429 1- A119 - XRA 130428 1441 1 A131 - XRA 130428 1457 1- 130428 1544 1- 130428 1557 1 130428 1701 1- A96 - XRA 130428 1805 1 130428 2020 2 A94 - XRA 130428 2331 1- A122 - QUAL 130429 0000 3 A125 - FLA 130429 0741 1+ A140 - QUAL 130429 0900 2 A118 - QUAL 130429 0945 1 A118 - XRA 130429 1934 1 A94 - XRA 130429 2032 1+ 130429 2058 1+ A125 - FLA 130429 2158 1- 130430 0130 1+ A120 - QUAL 130430 0340 1- A122 - QUAL 130430 0845 1- 130430 1316 1- A125 - FLA 130430 1651 1- A125 - QUAL 130430 1743 1 A125 - XRA 130430 2328 1 ************************************************** Importance Summary - Apr 2013 1- events: 81 1 events: 32 1+ events: 37 2 events: 31 2+ events: 16 3 events: 5 3+ events: 3 ------------------ Total events: 205