Sudden ionospheric disturbance

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Notion

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Science and technology

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What Wikipedia says

A sudden ionospheric disturbance (SID) is any one of several ionospheric perturbations, resulting from abnormally high ionization/plasma density in the D region of the ionosphere and caused by a solar flare and/or solar particle event (SPE).

Excerpt from the Wikipedia article “Sudden ionospheric disturbance”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Naval Postgraduate School, Public domain, via Wikimedia Commons.