Daily sunspot number (yellow), monthly mean sunspot number (blue), smoothed monthly sunspot number (red) for the last 13 years and 12-month ahead predictions of the monthly smoothed sunspot number:
SC (red dots) : prediction method based on an interpolation of Waldmeier’s standard curves; It is only based on the sunspot number series.
CM (red dashes) : method (from K. Denkmayr and P. Cugnon) combining a regression technique applied to the sunspot number series with the aa geomagnetic index used as a precursor (improved predictions during the minimum phase between solar cycles).
Grounding and Bonding for the Radio Amateur Grounding and Bonding for the Radio Amateur by Ward Silver, N0AX, is now available from ARRL. Proper station grounding is important! Build your ham radio station with effective grounding and bondi... Read more
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