AAVSO Sudden Ionospheric Disturbance Report February 1989 Observers: A-01 A-03 A-09 A-19 A-26 A-40 A-46 A-49 A-50 A-52 A-59 A-60 A-61 YYMMDD Event Peak (UT) Importance 890201 0744 1 890201 0812 2 890201 1325 2+ 890201 1618 2 890201 1743 1 890201 1902 1- 890202 0831 1- 890202 1728 2+ 890202 2032 1- 890203 1430 2+ 890203 1830 2+ 890204 0427 1+ 890204 0538 2 890204 0625 2 890204 0811 2 890204 1001 3+ 890205 0508 2 890205 1859 1- 890205 1919 2 890205 2105 1+ 890206 0814 1+ 890206 0913 2+ 890206 1433 2 890206 1542 1 890206 1647 2 890206 1803 1- 890206 1920 2+ 890206 2126 2+ 890207 1445 1+ 890207 1508 1- 890207 1641 2 890208 0621 1+ 890208 0949 1+ 890208 1115 2 890208 1513 2+ 890208 1715 2 890208 2015 2 890209 1300 2+ 890209 1932 1 890210 0430 3 890210 2034 2 890211 1501 1- 890211 1625 1+ 890213 1632 1+ 890213 1825 2+ 890214 0500 2+ 890214 0604 1- 890214 0636 1- 890214 0710 1+ 890214 1420 1- 890214 1531 1 890215 0854 2 890215 1345 1- 890215 1428 1 890215 1853 1- 890215 1910 2 890216 0345 2 890216 0425 2 890216 1633 2+ 890216 2204 2 890217 1732 2+ 890217 2220 2+ 890218 0747 2+ 890218 1545 1- 890218 1845 1 890219 1402 2+ 890219 2117 2+ 890220 1400 2+ 890221 0913 2 890221 1400 1+ 890221 1502 1+ 890221 1603 1+ 890221 1700 1 890221 1743 1 890221 1804 1- 890221 1820 1+ 890221 2113 1 890221 2158 1+ 890222 0802 1 890222 1302 1- 890222 1444 1 890222 1600 2 890222 1717 1- 890222 1748 2+ 890223 1720 2 890223 1949 2 890223 2112 1 890224 0831 1+ 890224 1423 2+ 890224 1546 1- 890224 1602 2 890224 2015 2 890224 2113 1+ 890224 2302 1+ 890225 1405 1- 890225 1516 1 890225 1926 1+ 890226 1658 2 890228 1524 1 890228 1647 1 890228 1707 1+ 890228 1815 2+ ******************************************* Importance Summary February 1989 1- events: 18 1 events: 16 1+ events: 19 2 events: 26 2+ events: 21 3 events: 1 3+ events: 1 Total events: 102