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TeachMeFinance.com - explain Sunspot Number Sunspot Number The term 'Sunspot Number' as it applies to the area of the weather can be defined as ' In solar-terrestrial terms, a daily index of sunspot activity (R), defined as R = k (10 g + s) where S = number of individual spots, g = number of sunspot groups, and k is an observatory factor'. Previous 5 Terms: sunphotometer Sunrise Sunset sunspot Sunspot Group Classification Next 5 Terms: sun-synchronous Super 301 Super Typhoon Supercell Supercell Thunderstorm About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.