UPROP Codes

Radio propagation indices for certain radio circuits, monitored at the observatory.

Example:

Definition of symbols:

First Lines-

  • UPROP comes from radio PROPagation

  • I I I I I = station indicator (see lists in Appendix C)

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

  • HH = UT hour of the start of the 24-hour period for which the Propagation Index is calculated
  • / = filler
  • z z = last two digits of check sum of all the following digits

Data Lines-

  • a a = circuit monitored
    • 01 = Tokyo, Japan
    • 02 = New York, USA
    • 03 = Tehran, Iran
    • 04= Oslo, Norway
    • 05 = Bracknell, England
    • 06 = Canberra, Australia
    • 07 = Johannesburg, South Africa
    • 08 = Rome, Italy
    • 09 = Moscow, USSR
    • 10 = Fort Collins, Colorado, USA
    • 11 = Melbourne, Australia
  • b b = Propagation Index from 0.1 - 9.9, where 6.0 = normal.
  • Conditions are "normal" (index 6.0) if they correspond to the average of the preceding
  • 27 days (1 sun rotation) Scale of Propagation Index.
    • 0.1 - 1.0 = very poor
    • 1.1 - 3.0 = poor
    • 3.1 - 5.0 = fair
    • 5.1 - 7.0 = normal
    • 7.1 - 9.0 = good
    • 9.1 - 9.9 = very good
  • c = Number of frequencies that are used to calculate the Propagation Index.

Note: The Melbourne circuit consists of five frequencies that transmit for the world-wide CCIR HF field strength measuring campaign.

Last Data Lines-

  • 99999 = end of data terminator - indicates that all coded data has been received

  • PLAIN = Plain language text information

  • BT = Break in transmission (end of message terminator)