AAVSO Sudden Ionospheric Disturbance Report March 1987 Observers: A-01 A-03 A-09 A-19 A-26 A-46 A-49 A-50 A-52 YYMMDD Event Peak (UT) Importance 870308 1940 2 870324 0305 1+ ******************************************* Importance Summary March 1987 1- events: 0 1 events: 0 1+ events: 1 2 events: 1 2+ events: 0 3 events: 0 3+ events: 0 Total events: 2