AAVSO Sudden Ionospheric Disturbance Report September 1997 Observers: A-05 A-09 A-40 A-50 A-52 A-62 A-63 A-69 A-72 A-80 A-81 A-82 A-83 A-84 YYMMDD Event Peak (UT) Importance 970902 1231 2 970902 1645 1- 970903 1511 1+ 970903 1943 1- 970909 1841 2 970910 0952 2+ 970913 1952 1 970914 1705 1- 970915 0649 1 970917 1144 2 970917 1731 1 970917 1752 2+ 970917 2255 1+ 970918 1711 1- 970918 1939 1- 970918 1955 1- 970920 0954 3+ 970922 1317 1 970922 1419 1+ 970924 1832 2 ******************************************* Importance Summary September 1997 1- events: 6 1 events: 4 1+ events: 3 2 events: 4 2+ events: 2 3 events: 0 3+ events: 1 Total events: 20