Transcription of GROUP SUNSPOT NUMBERS: SUNSPOT CYCLE …
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GROUP SUNSPOT NUMBERS: SUNSPOT CYCLE …
GROUP SUNSPOT NUMBERS: SUNSPOT CYCLE CHARACTERISTICSDAVID H. HATHAWAY, ROBERT M. WILSON and EDWIN J. REICHMANNNASA/Marshall Space Flight Center, Huntsville, AL 35812, (Received 26 February 2002; accepted 17 April 2002) examine the GROUP SUNSPOT numbers constructed by Hoyt and Schatten to determinetheir utility in characterizing the solar activity CYCLE . We compare smoothed monthly GROUP sunspotnumbers to Z rich (International) SUNSPOT numbers, radio flux, and total SUNSPOT area. Wefind that the Z rich numbers follow the radio flux and total SUNSPOT area measurements onlyslightly better than the GROUP numbers. We examine several significant characteristics of the sunspotcycle using both GROUP numbers and Z rich numbers. We find that the Waldmeier Effect the anti-correlation between CYCLE amplitude and the elapsed time between minimum and maximum of a CYCLE is much more apparent in the Z rich numbers. The Amplitude Period Effect the anti-correlationbetween CYCLE amplitude and the length of the previous CYCLE from minimum to minimum is alsomuch more apparent in the Z rich numbers.
GROUP SUNSPOT NUMBERS: SUNSPOT CYCLE CHARACTERISTICS 359 where N is the number of observers, k i is the correction factor for observer i,and g i is the number of sunspot groups reported by observer i.Through the diligent efforts of Hoyt and Schatten this …
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