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Meanings of sudden ionospheric disturbance in English
Portuguese
perturbação ionosférica súbita Spanish
perturbación ionosférica súbita 
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).
See moreTranslations for sudden ionospheric disturbance
Portuguese