AAVSO Sudden Ionospheric Disturbance Report July 1987 Observers: A-01 A-09 A-19 A-26 A-46 A-49 A-50 A-52 A-59 YYMMDD Event Peak (UT) Importance 870719 1852 1+ 870722 1532 2 870722 1645 1 870722 2100 1+ 870723 1816 1+ 870723 1929 2+ 870724 0959 1- 870725 2117 1+ 870727 1814 2+ ******************************************* Importance Summary July 1987 1- events: 1 1 events: 1 1+ events: 4 2 events: 1 2+ events: 2 3 events: 0 3+ events: 0 Total events: 9