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• Organization: National Oceanic and Atmospheric Administration, Department of Commerce
• Updated: 1958-01-01T00:00:00.000+00:00 | Harvested: October 04, 2025 at 05:52 AM

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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