NOAA SWPC · Sunspot number

Solar Flare Activity

Solar flares ride the Sun's ~11-year cycle, tracked by the sunspot number. Each peak ('solar maximum') brings more flares, auroras and space-weather disruption; we are near the Cycle 25 peak now.

Solar Flare Activity — PublicChartsThe sunspot number since 1900, tracing the ~11-year solar cycle that drives solar flares and space weather. Source: NOAA SWPC.Solar Flare ActivitySolar flares ride the Sun's ~11-year cycle, tracked by the sunspot number. Each peak ('solar maximum') brings more flares, auroras and space-weather disruption; we are near the Cycle 25 peak now.