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Aurore boreali sono state visibili in Svizzera nella notte tra martedì e mercoledì a seguito di una tempesta solare assai intensa. Sono state registrate dalle telecamere del Rigi (Svitto) e del Säntis, tra Appenzello e San Gallo.
L'aurora boreale colora il cielo notturno
L’Agenzia statunitense per l’osservazione oceanica e atmosferica (NOAA) ha classificato la tempesta geomagnetica al secondo livello di allerta più elevato, G4. Eventi di questo tipo possono generare variazioni di tensione nelle reti elettriche, oltre a perturbare segnali satellitari, radio e GPS, precisa l’agenzia. Anche il traffico aereo e gli oleodotti possono essere interessati.
Le aurore boreali sono rare nella regione alpina. Si formano quando particelle ad alta energia provenienti da tempeste solari incontrano il campo magnetico terrestre. Più i venti solari sono forti e più il luogo di osservazione è buio, maggiori sono le probabilità di vederle.
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