Also the background x-ray solar flux is A9.7 and the Dst index is a
-4, which are more reliable indicators of good MF propagation band conditions
than the Ap and Kp indices.
Here are some general guidelines concerning
correlation of MF propagation indices to actual expected propagation conditions.
1.) Dropping indices numbers are better.
2.) For medium frequencies a solar flux under 150, under 100 better, 70 is best for E layer multi hop. Keep in mind though that the 10.7 cm (2800 mhz) solar flux index is not a "reliable" gauge of ionization in our atmosphere for F layer MF frequency refractions, as the energy of photons at this frequency is to low on the order of one million times. However most are used to solar flux and sunspot number and it's a hard habit to break. A better indicator is the background x-ray flux. See #7 below. 3.) Solar flux of at least 100 for E
valley-F layer ducting mechanism.
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