In “The New Sunspot Numbers” (Oct. 2016 QST, pp. 38-41), Carl Luetzelschwab, K9LA, reviews the history of sunspot numbers and how they are calculated, as well as explains a new formulation of sunspot numbers in use by the Royal Observatory of Belgium. Sunspot numbers are important because they are correlated with the atmospheric ionization on Earth.
Researchers and HamSCI volunteers meet at the 2016 Dayton Hamvention to plan the 2017 Solar Eclipse QSO Party. (Left to Right) Magda Moses KM4EGE, Nathaniel Frissell W2NAF, Ward Silver N0AX. Photo by Bob McGwier N4HY.