AAVSO Sudden Ionospheric Disturbance Report January 1987 Observers: A-50 YYMMDD Event Peak (UT) Importance 870122 1715 1 ******************************************* Importance Summary January 1987 1- events: 0 1 events: 1 1+ events: 0 2 events: 0 2+ events: 0 3 events: 0 3+ events: 0 Total events: 1