The Solar Cycle

Area of Science:

• Solar physics
• Astronomy

Background:

• The 11-year solar cycle is a fundamental aspect of solar activity.
• Numerous indicators, including sunspots, radio flux, and geomagnetic activity, correlate with this cycle.

Approach:

• This review synthesizes information on the characteristics of individual solar cycles.
• It examines cycle-to-cycle and short-term variability, including phenomena like the Maunder Minimum and double-peaked maxima.

Key Points:

• Solar cycle characteristics include maxima, minima, amplitude, shape, and latitudinal drift of active regions.
• Variability encompasses long-term trends (Maunder Minimum, Gleissberg Cycle) and short-term fluctuations (154-day periodicity).
• Solar activity indicators such as sunspots, radio flux, irradiance, and geomagnetic activity are discussed in relation to the solar cycle.

Conclusions:

• Understanding solar cycle prediction techniques is crucial for space weather forecasting.
• The review provides insights into solar cycles 23 and 24, highlighting their specific features and prediction challenges.