What is another word for sudden ionospheric disturbance?
Pronunciation: [sˈʌdən ˌa͡ɪənəsfˈɛɹɪk dɪstˈɜːbəns] (IPA) 
Sudden ionospheric disturbance is a term used in space weather science to describe unexpected changes in the Earth's ionosphere. There are a few synonyms which also describe this phenomenon, including ionospheric storms, ionospheric perturbations or ionospheric irregularities. These terms are all variations on the idea that the ionosphere, which plays an important role in the propagation of radio waves and other signals, can be unexpectedly disrupted. This may be caused by a variety of space weather events, such as solar flares or coronal mass ejections, and can have implications for technologies like GPS or satellite communications which rely on accurate readings from the ionosphere.
