3 ms·
https://www.spaceweatherlive.com/en/solar-activity/solar-cycle/historical-solar-cycles.html https://www.spaceweatherlive.com/en/solar-activity/solar-cyc...
by bburrito 4y ago
https://www.spaceweatherlive.com/en/solar-activity/solar-cycle/historical-solar-cycles.html https://www.spaceweatherlive.com/en/solar-activity/solar-cyc...