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• Organization: National Oceanic and Atmospheric Administration, Department of Commerce
• Dataset Last Updated: September 01, 2009 at 12:00 AM

Solar-Geophysical Data (SGD) reports were a comprehensive compilation of many different kinds of observational data of the sun's activity and its effects on the Earth. Data from the worldwide...

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• Organization: National Oceanic and Atmospheric Administration, Department of Commerce
• 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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