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Solar Features - Solar Flares - SIDS

Published by NOAA National Centers for Environmental Information | National Oceanic and Atmospheric Administration, Department of Commerce | Catalog Last Checked: April 12, 2026 at 04:30 AM | Dataset Last Updated: October 01, 2011 at 12:00 AM
A Sudden Ionospheric Disturbance (SID) is any of several radio propagation anomalies due to ionospheric changes resulting from solar or geophysical events.

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