AAVSO Sudden Ionospheric Disturbance Report
     April 1998

     Observers:
     A-05   A-09   A-50   A-52   A-62
     A-63   A-72   A-78   A-81   A-82
     A-84   A-87   A-89

     YYMMDD      Event Peak (UT)   Importance
     980401         1405                1  
     980401         1532                2  
     980402         1428                1  
     980404         0747                2+ 
     980404         1825                1+ 
     980404         2053                2  
     980405         1311                2  
     980405         1619                2+ 
     980405         1816                1+ 
     980405         2139                2  
     980406         0705                2  
     980406         1637                2  
     980408         2139                1+ 
     980409         1817                2  
     980409         1939                1  
     980410         1752                1  
     980414         1908                2  
     980415         0747                2  
     980415         1225                2+ 
     980415         1506                2+ 
     980423         0535                2  
     980424         0846                2+ 
     980425         1421                3  
     980425         1806                1+ 
     980427         0849                3  
     980429         1621                2  
     980430         2124                2+ 
     *******************************************
     Importance Summary April 1998
        1- events:  0
        1  events:  4
        1+ events:  4
        2  events:  11
        2+ events:  6
        3  events:  2
        3+ events:  0
     Total events:  27