About how long is the sunspot (solar) cycle?

References

Answer: About 11 years. NOAA says the number of sunspots varies with an approximately 11-year repetition known as the solar cycle. HF band conditions improve and fade along with it.

1. NOAA SWPC Sunspots and Solar Cycle www.spaceweather.gov/phenomena/sunspotssolar-cycle

   an approximately 11-year repetition known as the solar cycle

   Checked 2026-10-11.
2. NOAA SWPC Sunspots and Solar Cycle www.spaceweather.gov/phenomena/sunspotssolar-cycle

   Solar cycle 24 began in December 2008

   Checked 2026-10-11.
3. NOAA SWPC Sunspots and Solar Cycle www.spaceweather.gov/phenomena/sunspotssolar-cycle

   each sunspot group counts as 10

   Checked 2026-10-11.

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