Propagation

         Propagation & spaceweather

Solar cycle  25 

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Where the above map indicates the foF2 NVIS Critical Frequency, the relationship between the foF2 frequency and the Maximum Usable Frequency (MUF) is approximately 1:3. Multiplying the foF2 critical frequency by 3 approximates the MUF. The following color chart is adjusted to indicate the MUF.

MISSING MUF_colors.png

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