Ilmo Anttila wrote:
> Topbanders
>
> I do follow solar wind and dynamic pressure readings daily. To my opinion
> both of them indicate very well propagation on topband even better than A and
> K indexes.
> Good rule of thumb is, if solar wind speed is less than 300km/s and dynamic
> pressure less than 0,5 nPa it is expected very good conditions to JA, NA and
> even direct over North Pole here in South Finland above 60 degrees North.
>
> 73
>
> Ilmo, OH2BO
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>
OK , answered my own question.
http://www.swpc.noaa.gov/SWN/sw_dials.html
Formula is P (in nPa) = 1.6726e-6 x n x V^2.
Greg, ZL3IX
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