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TeachMeFinance.com - explain period decay (aka decay) period decay (aka decay) The term 'period decay (aka decay)' as it applies to the area of Earth observation can be defined as ' The tendency of a satellite to lose orbital velocity due to the influence of atmospheric drag and gravitational forces. A decaying object eventually impacts the surface of the Earth or burns up in the atmosphere. This parameter directly affects the satellite's mean motion'. Previous 5 Terms: perigee (aka periapsis or perifocus) perihelion perimeter period period Next 5 Terms: periodic current Periodic Facility Review (PFR) periodic function Periodic table periodic table 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.