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Table 1 Number of data events processed from October 1989 to September 1997

From: Statistical study on propagation characteristics of Omega signals (VLF) in magnetosphere detected by the Akebono satellite

  Dawn Day Dusk Night Total
1989 95,854 92,003 14,297 11,001 213,155
1990 48,231 76,448 89,670 59,446 273,795
1991 91,456 71,240 92,925 79,300 334,921
1992 117,240 104,322 92,652 94,576 408,790
1993 108,802 115,379 93,782 74,649 392,612
1994 105,783 88,317 88,951 91,894 374,945
1995 72,069 105,293 97,962 58,127 333,451
1996 92,192 81,758 88,379 68,660 330,989
1997 92,197 86,643 102,857 86,259 367,956
Total 823,824 821,403 761,475 623,912 3,030,614