AAVSO Sudden Ionospheric Disturbance Report November 1991 Observers: A-01 A-03 A-09 A-19 A-40 A-50 A-52 A-59 A-61 A-62 A-63 A-64 A-65 A-66 A-67 A-68 A-69 A-70 A-71 A-72 A-73 A-74 YYMMDD Event Peak (UT) Importance 911101 0338 1- 911101 0425 1+ 911101 1331 1+ 911101 1401 1+ 911101 1448 1 911101 1512 1 911101 1530 1- 911101 1697 1 911101 1658 1- 911101 1808 1+ 911101 1928 1+ 911101 2030 2 911101 2127 1- 911101 2200 1+ 911101 2238 1- 911101 2351 1- 911102 0123 1- 911102 0636 1 911102 0647 2+ 911102 1151 2 911102 1635 3+ 911102 1744 1- 911102 2233 1+ 911103 1514 2+ 911103 1552 1- 911103 1620 2 911103 1950 2 911103 2045 1- 911103 2246 1- 911103 2322 1+ 911104 0430 1 911104 1538 2+ 911104 1810 1- 911104 1913 2 911104 2322 3 911105 1617 2 911105 1932 1+ 911105 2044 2+ 911105 2209 2 911106 0045 1- 911106 0240 1- 911106 0412 2 911106 0447 2 911106 1131 1 911106 1332 1+ 911106 1810 1- 911106 1843 1 911106 1926 2+ 911106 2355 2 911107 1504 1 911107 1517 2 911107 1713 1+ 911107 1736 1+ 911107 1805 1 911107 1834 1 911108 0045 1- 911108 0216 1- 911108 0230 1 911108 0634 1+ 911108 1315 1- 911108 1352 2+ 911108 1503 1 911108 1709 2+ 911108 1829 1 911108 1907 2 911108 1936 1+ 911108 2016 1+ 911108 2137 2 911108 2224 1+ 911109 0045 2 911109 0316 2+ 911109 1208 1- 911109 1357 1 911109 1500 1 911109 1510 1 911109 1538 2+ 911109 1853 1- 911109 2000 1 911109 2052 2 911110 0130 1+ 911110 0647 2+ 911110 1400 2 911110 1815 2 911110 2010 2 911110 2052 1- 911110 2121 1 911111 0115 1- 911111 1245 1+ 911111 1447 1 911111 1639 2 911111 1703 1 911111 1903 1+ 911111 1955 2+ 911111 2100 1- 911111 2144 2 911112 1633 2+ 911112 2030 2+ 911113 0053 1- 911113 1500 3 911113 2126 2 911113 2301 2+ 911114 1304 2 911114 1545 1+ 911114 1800 1 911114 1843 1 911115 1114 2 911115 1343 1- 911115 1714 1+ 911115 2238 3 911116 1248 1 911116 1705 1+ 911116 1944 2 911117 0515 1+ 911117 0708 2+ 911117 0927 1+ 911117 1005 1- 911117 1545 1- 911117 1745 1- 911117 1832 1+ 911117 1946 1 911117 2224 1 911118 1054 2+ 911118 1259 1- 911118 1747 1- 911119 0015 1+ 911119 0931 1+ 911119 1343 1- 911119 1512 1 911119 1631 2+ 911119 1724 2+ 911119 1923 2 911119 2023 1+ 911120 0059 2 911120 1212 1+ 911120 1324 1 911120 1925 1- 911120 1944 1+ 911121 1645 1 911121 1722 3 911121 1859 2+ 911122 1445 2 911123 1555 2 911124 0824 1 911124 1530 1 911126 0732 1- 911126 1005 1+ 911126 2057 1+ 911127 1817 2 911127 2057 2+ 911128 0800 2+ 911128 1345 2+ 911129 1622 1- 911129 2014 1 911130 0344 1+ 911130 0956 1 911130 1344 1 911130 1717 1 911130 1913 2+ ******************************************* Importance Summary November 1991 1- events: 34 1 events: 34 1+ events: 33 2 events: 29 2+ events: 23 3 events: 4 3+ events: 1 Total events: 158