AAVSO Sudden Ionospheric Disturbance Report 
     September 1998
  
     Observers:
     A-40   A-50   A-52   A-62   A-63   
     A-72   A-80   A-81   A-82   A-84   
     A-90   
     
     YYMMDD      Event Peak (UT)   Importance
     980901         0455                2  
     980901         1155                2  
     980901         1235                1+ 
     980901         1817                2  
     980901         2029                1+ 
     980901         2243                1  
     980902         0915                2  
     980902         0932                2  
     980902         1530                2  
     980902         1705                2+ 
     980902         2212                2  
     980903         0545                1  
     980903         1425                2+ 
     980903         1550                3  
     980904         0948                1+ 
     980904         1455                1- 
     980904         2340                2  
     980905         0800                2  
     980905         1415                1  
     980905         1730                1+ 
     980905         1910                1  
     980906         0612                2+ 
     980906         1107                1- 
     980906         1555                1  
     980906         1920                2  
     980906         2000                2+ 
     980908         1040                1  
     980908         1220                2  
     980909         0457                2  
     980909         1420                1  
     980909         1740                1  
     980909         1830                1- 
     980910         2140                1- 
     980911         0540                2  
     980911         1526                2  
     980911         1604                2+ 
     980911         2049                1+ 
     980912         1255                1  
     980912         2035                1+ 
     980913         0904                2+ 
     980913         1305                1  
     980913         1421                1  
     980913         1616                1  
     980913         1826                1- 
     980920         0950                1- 
     980921         1822                1+ 
     980922         2058                2+ 
     980923         0040                3  
     980923         0657                2+ 
     980924         0815                1  
     980924         0835                1- 
     980925         1110                1- 
     980925         1150                1+ 
     980925         1837                1- 
     980925         2325                2  
     980926         0650                1  
     980926         1500                1- 
     980926         1620                1- 
     980926         1829                1- 
     980927         0810                2  
     980927         1640                2  
     980927         2346                2+ 
     980928         0551                2  
     980928         0655                2  
     980928         1200                1- 
     980928         1610                1+ 
     980930         1338                3+ 
     *******************************************
     Importance Summary September 1998
        1- events:  13
        1  events:  14
        1+ events:  9
        2  events:  19
        2+ events:  9
        3  events:  2
        3+ events:  1
     Total events:  67