An approximately 11-year periodic change in the Sun's activity, marked by variations in the number of sunspots, solar flares, and other solar phenomena. The cycle reflects changes in the Sun's magnetic field strength and configuration.
The term emerged in the 19th century when Heinrich Schwabe discovered the periodic nature of sunspot activity after decades of careful observation. 'Cycle' comes from Greek 'kyklos' meaning circle or recurring period, reflecting the repetitive nature of solar activity.
The solar cycle is like the Sun's heartbeat - during solar maximum, the Sun can have hundreds of sunspots and frequent flares, while during solar minimum, the Sun can go weeks without a single sunspot, appearing almost perfectly smooth! This cycle affects everything from satellite operations to the number of auroras we see, and it's driven by the Sun's magnetic field doing a complete somersault every 22 years.
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