Solar Cycle (11-year)
2.90 × 10⁻⁹ Hz
The activity of the Sun rises and falls over about 11 years: sunspots, flares and geomagnetic storms.
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MeasuredPhysical measurement
Measured directly, or defined by a published standard.
This value is measured, or set by a published standard.
What the four labels meanChecked against sources September 27, 2026
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About this number
The activity of the Sun rises and falls over about 11 years: sunspots, flares and geomagnetic storms. The magnetic field of the Sun reverses each cycle, so the full magnetic cycle is about 22 years (the Hale cycle).
Facts
- Frequency
- 2.90 × 10⁻⁹ Hz
- One cycle takes
- 11 years
- Refers to
- Sunspot cycle / solar magnetic reversal
- Kind of statement
- Physical measurement
- Filed under
- Earth, Moon & Sun
Sources
- NASA and NOAA reference pages
Orbital periods, lunar cycles and the solar cycle.
NASA Planetary Fact Sheets. NASA Eclipse Web Site (lunar cycles, Saros). NOAA Space Weather Prediction Center (solar cycle).
View source: NASA and NOAA reference pages