IONFM Codes

UFOFS, UFOFH, UMUFH, UFMNH , and UFESH

Hourly ionospheric data.

Example:

Definition of symbols:

  • IONFM comes from IONospheric data, FrequencyMeasurements

  • I I I I I = station indicator

  • Y = last digit of year
  • MM = month of year, 01 = January, 02 = February, etc
  • . DD = UT day of month

  • / = filler
  • HHmm = UT hour and minute of first data reported

  • K = double hour (UT) indicator
    • 0 = 00 or 01, 20 or 21
    • 1 = 02 or 03, 22 or 23
    • 2 = 04 or 05
    • 3 = 06 or 07
    • 4 = 08 or 09
    • 5 = 10 or 11
    • 6 = 12 or 13
    • 7 = 14 or 15
    • 8 = 16 or 17
    • 9 = 18 or 19
  • FF = F2 critical frequency in tenths of MHz
  • MM = M-3000 maximum usable frequency in tenths of MHz

  • EEE = Es critical frequency in tenths of MHz
  • NN = Fmin frequency in tenths of MHz

Note: / is to be used for data not available.