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TeachMeFinance.com - explain Sudden Impulse (SI+ or SI-) Sudden Impulse (SI+ or SI-) The term 'Sudden Impulse (SI+ or SI-)' as it applies to the area of the weather can be defined as ' In solar-terrestrial terms, a sudden perturbation of several gammas in the northward component of the low-latitude geomagnetic field, not associated with a following geomagnetic storm. (An SI becomes an SC if a storm follows.)'. Previous 5 Terms: succinic succiniferous Suction Head Suction Vortex Sudden Commencement (SC) Next 5 Terms: Sudden Ionospheric Disturbance (SID) sudiform sudoriferous suede Suess effect 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.