AAVSO Sudden Ionospheric Disturbance Report 
     September 1989
  
     Observers:
     A-01   A-03   A-09   A-19   A-46   
     A-50   A-52   A-61   A-62   A-63   
     A-64   A-65   
     
     YYMMDD      Event Peak (UT)   Importance
     890901         1505                2  
     890901         1546                2  
     890901         1718                1+ 
     890922         1143                2+ 
     890902         1318                1- 
     890902         1720                2  
     890902         1822                2  
     890902         1945                2+ 
     890902         2110                2+ 
     890902         2232                2+ 
     890903         1432                2  
     890903         1503                2  
     890903         1515                2  
     890903         1846                1+ 
     890904         1000                2  
     890904         1306                1+ 
     890904         1529                2  
     890904         1615                1+ 
     890904         1913                2  
     890904         2113                2  
     890905         1343                2  
     890905         1427                2  
     890905         1610                2+ 
     890905         1958                1+ 
     890905         2130                2+ 
     890905         2222                1+ 
     890906         1659                1  
     890906         1755                1+ 
     890907         1536                1+ 
     890907         1903                2  
     890909         2112                2+ 
     890908         1510                2+ 
     890908         1806                2+ 
     890908         2031                1  
     890908         2128                2+ 
     890909         1534                1+ 
     890909         1856                2  
     890909         1934                2  
     890910         1259                1+ 
     890910         1333                1+ 
     890910         1458                1- 
     890910         1512                1- 
     890911         1658                1  
     890911         1944                1  
     890911         2106                2+ 
     890911         2349                1+ 
     890914         1736                1  
     890914         1832                2  
     890914         2358                1  
     890915         1328                1  
     890915         1344                1- 
     890916         1630                2  
     890916         1850                1  
     890917         1840                2+ 
     890918         1548                1  
     890918         1614                2  
     890918         1859                2+ 
     890918         2030                1+ 
     890919         1604                2  
     890919         1946                2  
     890920         1805                2  
     890921         1600                2  
     890921         1733                2  
     890922         1710                2  
     890923         2236                1+ 
     890924         1319                2+ 
     890924         1542                1+ 
     890924         1708                1  
     890924         1759                2+ 
     890924         2046                2  
     890925         1930                2  
     890925         2130                2  
     890926         1445                2+ 
     890926         1650                3  
     890926         1902                2+ 
     890927         1705                2  
     890928         1348                1+ 
     890929         1130                2+ 
     890929         1516                2+ 
     890929         1828                2  
     *******************************************
     Importance Summary September 1989
        1- events:  4
        1  events:  10
        1+ events:  16
        2  events:  30
        2+ events:  19
        3  events:  1
        3+ events:  0
     Total events:  80