The Cormac Propadex - Current Ionospheric Conditions:
  • Propadex is updated four times per hour
  • Eight hours of history is shown on the graph.
  • When the Propadex is high, it means the F2 maximum useable frequency is higher than average for this time of day.

Technical Details:
  • The Cormac Propadex is based entirely on the latest government reports for f0F2. This is the maximum useable frequency for the F2 ionosphere layer. Some government stations are updating this value 4 to 6 times per hour.
  • The Propadex value is the DIFFERENCE between the latest reported f0F2 value and the 60 day average FOR THIS SAME TIME OF DAY.
  • For example, if the Propadex shows as +110 at time 1700 Z, it means means the government monitoring station is reporting a maximum usable frequency 1.10 MHz higher than the 60 day average for this exact same time of day.
  • Currently, we are obtaining data from the U.S. Air Force Radio Solar Telescope Network (RSTN) site at Wallops Island, Virginia. This site appears to be updating data several times per hour.


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    <img src="http://qsonet.com/propadex.png" width=146 height=120 border=0>

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