AAVSO Sudden Ionospheric Disturbance Report November 1999 Observers: A-09 A-40 A-50 A-52 A-62 A-63 A-72 A-80 A-81 A-83 A-84 A-87 YYMMDD Event Peak (UT) Importance 991101 1150 1 991102 0950 1- 991102 1320 1- 991104 0502 2+ 991105 0633 2 991105 1715 2 991105 1806 3+ 991106 0635 2 991106 1100 1- 991106 1705 2+ 991107 0436 1- 991107 0735 1 991108 0605 1+ 991108 1609 1 991108 1703 1- 991108 1846 2+ 991108 1953 2+ 991109 0420 1 991109 0508 1- 991109 0530 1+ 991109 0837 1+ 991109 1255 1 991109 1535 1 991109 1600 1 991109 1622 1 991109 1746 2+ 991109 1955 2+ 991110 0604 1 991110 0713 1+ 991110 1548 1+ 991110 1946 2 991110 2145 2 991111 0150 1- 991111 0327 1+ 991111 0453 1 991111 0940 1+ 991111 1325 1+ 991111 1445 2 991112 0827 1+ 991112 0908 2+ 991112 0953 2 991112 1155 1 991112 1725 1+ 991113 1245 1+ 991113 1525 1 991113 1610 2 991113 1919 1- 991114 0352 1- 991114 0442 1 991114 0618 1 991114 0800 2+ 991114 0923 2 991114 1312 1- 991114 1450 2+ 991114 1607 1 991114 1328 1+ 991114 1706 2 991114 1810 2 991115 0832 2+ 991115 1315 1 991116 0238 2+ 991116 0407 1+ 991116 0736 2+ 991116 0917 2 991116 1035 2+ 991116 1406 2+ 991116 1552 2+ 991116 1645 2+ 991117 0847 1- 991117 0935 1 991117 0953 2+ 991117 1204 1 991117 1603 1+ 991117 1741 2 991118 0148 1 991118 0804 1+ 991118 1901 1+ 991119 1050 1- 991119 1505 1- 991120 1150 1 991120 1235 1- 991120 1929 1+ 991121 0828 1+ 991121 1015 2 991121 1820 2+ 991122 1218 1+ 991123 1410 1- 991124 0924 1+ 991124 1045 2 991124 1220 2 991124 1930 1- 991125 0646 1+ 991125 0825 1 991125 1030 2 991125 1715 2+ 991125 1910 2+ 991126 0120 2 991126 0400 2+ 991126 0705 1+ 991126 0910 2+ 991126 1345 2+ 991127 0250 2 991127 0455 1+ 991127 0550 1+ 991127 1010 1+ 991127 1130 2 991127 1210 2 991128 0555 2 991128 1040 1- 991128 1155 1 991128 1400 1- 991128 1820 3+ 991129 0854 1+ 991130 0830 1- 991130 1607 1- 991130 1740 1- ******************************************* Importance Summary November 1999 1- events: 21 1 events: 22 1+ events: 26 2 events: 22 2+ events: 23 3 events: 0 3+ events: 2 Total events: 116