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In a previous paper [Chadwick, 1961] the au thor i derived regression equations for each month of th e year , by means of which , upon substituLing a value fOT J (defined as the dillI"n111 m~tximum of mon thly medi::tll JoFz in megacycles per second , i. e., the highest value from among the 24 hourly medians for ::t given month) vaJues of Hz (12-month runn ing average Zurich sun spot numb er) co uld be estimated . Values of H(est) using JoFz data hom "Washington, D.C., were presented. Sample resul ts for Fairbanks, Alaslm, Christchurch , N. Z., a nd Huancil:Yo , P eru, wore shown for purposes of comparIson .

Effective sunspot numbers, January 1961 through July 1962