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TeachMeFinance.com - explain Penumbra Penumbra The term 'Penumbra' as it applies to the area of the weather can be defined as ' In solar-terrestrial terms, the sunspot area that may surround the darker umbra or umbrae. It consists of linear bright and dark elements radial from the sunspot umbra'. Previous 5 Terms: penology Penstock pentagon Pentanes plus pentheraphobia Next 5 Terms: Peptide per per capita use percent Percent difference 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.