Leggendo la descrizione del GS4 in questa pagina www.swpc.noaa.gov/noaa-scales-explanation ho compreso che si tratta di un fenomeno quasi estremo con una visibilità dell'aurora al 45° (per intenderci Torino Milano Mantova).
“ Power systems: Possible widespread voltage control problems and some protective systems will mistakenly trip out key assets from the grid.
Spacecraft operations: May experience surface charging and tracking problems, corrections may be needed for orientation problems.
Other systems: Induced pipeline currents affect preventive measures, HF radio propagation sporadic, satellite navigation degraded for hours, low-frequency radio navigation disrupted, and aurora has been seen as low as Alabama and northern California (typically 45° geomagnetic lat.). „
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