The Sun’s Little-Known 100-year “Gleissberg Cycle” is Waking Up
10 hours ago Anthony Watts
Via SpaceWeather.com You’ve heard of the 11-year sunspot cycle. But what about the Centennial Gleissberg Cycle? The Gleissberg Cycle is a slower 100-year modulation of sunspots. New research just published in the journal Space Weather suggests that the Gleissberg Cycle is waking up again, which could make solar cycles for the next 50 years increasingly intense.
The Sun's 100-year "Gleissberg Cycle" is Waking Up
The black line traces the Centennial Gleissberg Cycle, which modulates the 11-year sunspot cycle.
You’ve probably heard of the 11-year sunspot cycle. The Gleissberg Cycle is a slower modulation, which suppresses sunspot numbers every 80 to 100 years. For the past ~15 years, the sun has been near a low point in this cycle, but this is about to change.
New research published in the journal Space Weather suggests that the Gleissberg Cycle is waking up again. If this is true, solar cycles for the next 50 years could become increasingly intense.
https://wattsupwiththat.com/2025/05/08/the-suns-little-known-100-year-gleissberg-cycle-is-waking-up/
