AAVSO Sudden Ionospheric Disturbance Report March 1999 Observers: A-50 A-52 A-62 A-72 A-80 A-81 A-82 A-83 A-84 A-90 YYMMDD Event Peak (UT) Importance 990301 0540 2 990301 1335 1 990302 1211 1+ 990302 1326 1 990302 1520 2 990302 1550 1- 990303 1654 1- 990304 0513 1+ 990305 0835 1+ 990305 1924 2 990306 1409 1 990308 0638 2 990311 0645 1- 990311 0827 1+ 990311 1007 1+ 990311 1720 2 990311 2035 2+ 990312 0653 1 990312 0755 1- 990312 0800 1 990312 1553 1+ 990312 1730 2+ 990312 2040 1 990313 1052 1+ 990313 1110 1- 990313 2032 2+ 990314 0950 2 990314 1350 2+ 990314 1611 1- 990315 1255 2 990316 0630 2+ 990316 0942 2 990316 1330 1+ 990316 1720 2 990316 1832 2 990316 1903 2 990316 1931 1 990316 1952 1- 990316 2022 1- 990316 2110 2 990316 2140 2+ 990317 0956 2 990317 1145 1 990317 1215 1 990317 1231 1+ 990317 1407 1+ 990317 1450 2+ 990317 2155 2+ 990318 0407 2 990318 0525 1 990318 0730 1+ 990318 0832 2+ 990318 1330 2 990318 1422 2 990318 1605 1 990318 1746 1+ 990318 1829 1+ 990318 2008 1+ ******************************************* Importance Summary March 1999 1- events: 8 1 events: 11 1+ events: 14 2 events: 16 2+ events: 9 3 events: 0 3+ events: 0 Total events: 58