Those who dream of experiencing the emotion of the northern light -headed should marry a precise date on the agenda: on September 22, 2025. The autumn equinox will in fact be the moment when the phenomenon will reach its peak, giving flashes of rare intensity. A show that will not be repeated with the same strength before 2035.
Many enthusiasts have already noticed that between 1 and 2 September the sky has turned on with vivid ears, pushed by sudden magnetic storms. But what awaits us in the equinox is something much larger: a perfect window in which the sun and earth align in a way that the aurora almost inevitable, with an intensity capable of marking an era.
Because on September 22 it will be special
The secret lies in the Russel-McPherron effect. Put simply, during the equinox there are “cracks” in the terrestrial magnetic field that allow a huge amount of solar particles to penetrate the atmosphere. It is there that oxygen and nitrogen, affected by these particles, return energy in the form of spectacular colors: green, red, purple.
This means that not only the Arctic skies, but also regions with unusually low latitudes, will be able to dye with light aurors. And this is precisely the detail that makes 2025 a unique year: we are in the midst of the sun cycle that started in 2019, now close to its maximum. After the memorable storms of 2024, that of September could be the last opportunity to see the phenomenon in its most powerful form, before the sun slows down and the cycle slides towards the decline.
The wait until 2035
It does not mean that the aurora will disappear: at Arctic latitudes it will continue to dance in the sky, but with a more contained force. Canada, Iceland, Norway, Finland and Sweden will remain privileged destinations, but the aurores will hardly be able to go to the south as it will happen this year.
That’s why September 22, 2025 will be a day to remember. For many it will be the last chance, within a decade, to admire such a widespread and scenic northern light, even from areas that usually do not have this privilege.
Where to see it
Who wants to live the experience to the fullest must focus the regions of the Arctic Polar Circle: Iceland, Greenland, Finnish Lapland, Northern Sweden, Norway beyond Tromsø. Here the show is guaranteed, with clear skies and very long nights.
But the surprise concerns southern Europe. The forecasts speak of so intense aurore that they could also make themselves visible in Italyespecially in Northern Regions such as Piedmont, Lombardy, Veneto, Friuli Venezia Giulia and Trentino-Alto Adige. Everything, of course, will depend on the clear sky and the absence of light pollution.
Those who do not want to miss the opportunity should already organize themselves: choose remote places, far from cities, and keep an eye on the geomagnetic bulletins. Because if the sky open, on September 22 it will not be any night, but the night of the nights.
