Ionospheric Response to the X9.3 Flare on 6 September 2017 and Its Implication for Navigation Services Over Europe

On 6 September 2017, an X‐class flare of the magnitude 9.3 occurred around noon UT, being the strongest flare event in a decade. The flare itself was the highlight of a quite interesting phase of solar‐terrestrial interactions caused by the active region known as the Catania sunspot group 46 or acti...

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