AAVSO Sudden Ionospheric Disturbance Report 
     June 1999
  
     Observers:
     A-50   A-52   A-62   A-72   A-81   
     A-82   A-84   A-87   A-90   
     
     YYMMDD      Event Peak (UT)   Importance
     990601         0510                1  
     990601         0957                2  
     990601         1905                2  
     990601         2250                2  
     990601         2342                2+ 
     990602         0338                1- 
     990602         0404                2  
     990602         0757                1  
     990602         1342                1  
     990602         1934                2  
     990602         2053                3  
     990603         0535                2  
     990603         1620                1+ 
     990603         2112                2  
     990604         0552                2+ 
     990604         1141                2  
     990604         1530                1  
     990604         1932                1  
     990608         1800                2  
     990608         1916                2+ 
     990609         0223                1  
     990609         1542                2  
     990609         1910                2  
     990609         2050                2+ 
     990609         2252                1+ 
     990610         2103                2  
     990610         2128                2  
     990611         1821                2+ 
     990611         2019                2  
     990611         2110                2  
     990612         0830                1- 
     990612         1337                2+ 
     990612         1535                2+ 
     990612         2125                2  
     990612         2220                2  
     990612         2253                2  
     990613         1430                1- 
     990613         1514                1- 
     990616         1813                1+ 
     990617         1724                2+ 
     990618         0530                2  
     990618         0603                2  
     990618         1403                1  
     990618         1431                2+ 
     990618         1610                1+ 
     990618         1647                2+ 
     990618         1801                2  
     990618         1824                2  
     990618         2015                2+ 
     990618         2140                2+ 
     990619         1353                2+ 
     990619         2236                2+ 
     990620         0349                2  
     990620         0726                2  
     990620         1403                2+ 
     990620         1532                2+ 
     990620         1715                1- 
     990620         1728                2  
     990620         1918                2+ 
     990620         2007                2  
     990620         2111                2  
     990622         1715                2  
     990622         1828                3  
     990623         0048                2  
     990623         0529                2+ 
     990623         1818                1  
     990623         1833                1  
     990623         1857                1+ 
     990623         2053                2+ 
     990623         2315                2+ 
     990624         0700                1+ 
     990624         1415                1+ 
     990624         1543                1  
     990624         1842                2+ 
     990624         2007                2  
     990624         2305                2+ 
     990625         2203                1+ 
     990626         0400                2  
     990626         0610                1  
     990626         0630                2  
     990626         1334                2  
     990626         1646                2  
     990626         2037                2  
     990627         0732                2  
     990627         1528                2  
     990627         1846                2+ 
     990627         2054                2  
     990628         0110                2  
     990628         1815                2  
     990628         1852                3  
     990628         1913                2+ 
     990629         0356                2+ 
     990629         0520                1+ 
     990629         0709                3  
     990629         1414                2  
     990629         1514                2+ 
     990629         1803                2  
     990629         1911                2+ 
     990629         2210                2  
     990630         0330                2+ 
     990630         0533                2+ 
     990630         1017                2  
     990630         1128                2+ 
     990630         1642                2  
     990630         1737                1+ 
     990630         1808                2+ 
     990630         1936                2+ 
     990630         2010                2+ 
     *******************************************
     Importance Summary June 1999
        1- events:  5
        1  events:  11
        1+ events:  10
        2  events:  45
        2+ events:  33
        3  events:  4
        3+ events:  0
     Total events:  108