AAVSO Sudden Ionospheric Disturbance Report October 1989 Observers: A-01 A-03 A-09 A-19 A-46 A-50 A-52 A-59 A-61 A-62 A-63 A-64 A-65 YYMMDD Event Peak (UT) Importance 891002 1809 1- 891004 0847 2+ 891006 0620 2+ 891006 1747 1- 891007 0500 2+ 891010 0816 1 891010 1337 1+ 891010 1648 1+ 891011 0451 2 891012 0328 2+ 891012 0445 2+ 891012 1512 2+ 891013 0300 2+ 891013 0418 1 891013 0425 1- 891013 0529 3+ 891013 1556 1 891014 0700 2 891014 0836 1 891014 1752 1 891014 1816 1+ 891014 1858 1- 891015 1239 2 891015 1428 2+ 891016 1011 1- 891016 1040 1- 891017 1856 2+ 891018 0442 1- 891018 0502 1- 891018 0915 1- 891018 1214 1- 891018 1510 2 891018 1655 1 891018 1751 1+ 891018 1820 3 891019 0913 2 891019 1250 3+ 891020 0340 2 891020 0531 2 891020 0751 1+ 891020 1525 2+ 891020 2146 1+ 891021 0700 1- 891021 0716 1- 891021 0830 1 891021 1417 2+ 891021 1827 2 891021 1920 1+ 891021 2044 1+ 891022 1253 1+ 891022 1341 1+ 891022 1600 2 891022 1747 2+ 891023 1243 2 891023 1902 1+ 891024 1415 1 891024 1814 3 891025 0501 1+ 891025 1637 1 891026 1727 1- 891026 2046 2 891027 1135 1+ 891027 1902 2 891028 0941 1 891029 0410 2 891030 0855 1- 891030 1015 1- 891030 1946 2 891030 2115 2+ 891031 0815 1- 891031 1015 1+ 891031 1618 3+ 891031 1902 2 891031 2042 2+ ******************************************* Importance Summary October 1989 1- events: 16 1 events: 10 1+ events: 14 2 events: 15 2+ events: 14 3 events: 2 3+ events: 3 Total events: 74