• Organization: National Oceanic and Atmospheric Administration, Department of Commerce
• Updated: 2011-10-01T00:00:00.000+00:00

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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• Organization: U.S. Environmental Protection Agency
• Updated: 2025-03-03

We conducted a systematic review/meta-analysis for epidemiologic evidence of the association between long-term criteria air pollution (nitrogen dioxide (NO2), sulfur dioxide (SO2), coarse...

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• Organization: National Oceanic and Atmospheric Administration, Department of Commerce
• Updated: 1958-01-01T00:00:00.000+00:00

Sudden ionospheric disturbances (SID) are caused by solar flare enhanced X-rays in the 1 to 10 angstrom range. Solar flares can produce large increases of ionization in the D-region of the...

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• Organization: State of Maryland
• Updated: 2024-08-14

This is historical data. The update frequency has been set to "Static Data" and is here for historic value. Updated on 8/14/2024 Sudden Unexpected Infant Death Rate - This indicator shows the...

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• Organization: Department of the Interior
• Updated: 2013-01-01T00:00:00Z

This reference contains the imagery data used in the completion of the baseline vegetation inventory project for the NPS park unit. Orthophotos, raw imagery, and scanned aerial photos are common...

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