AAVSO Sudden Ionospheric Disturbance Report October 1999 Observers: A-05 A-50 A-62 A-63 A-72 A-80 A-81 A-83 A-84 A-87 A-90 YYMMDD Event Peak (UT) Importance 991001 1857 2+ 991002 1745 2 991006 2112 2 991007 1400 1 991007 2308 1+ 991008 1215 2+ 991009 1622 2+ 991012 1205 1 991012 1735 2+ 991013 0734 1 991013 1645 2 991014 1320 1+ 991017 1205 2 991017 1435 1- 991017 1802 2 991017 2208 1+ 991018 1415 1 991018 1512 1+ 991018 1556 2+ 991019 1125 3 991019 1435 2+ 991021 0730 1 991021 1050 2+ 991022 1343 2 991028 1534 2+ 991029 1555 2 ******************************************* Importance Summary October 1999 1- events: 1 1 events: 5 1+ events: 4 2 events: 7 2+ events: 8 3 events: 1 3+ events: 0 Total events: 26