What is a solar cycle?

Answer

The solar cycle is an 11-year cycle of solar activities during which there is a rise and fall in the numbers and surface area of sunspots. The solar cycle is also known as the solar magnetic activity cycle.
Q&A Related to "What is a solar cycle?"
the main source of periodic solar variation driving variations in space weather. The main cycle is 11 years llong
http://wiki.answers.com/Q/When+did+the+last+solar+...
( ′sō·lər ′sī·kəl ) (astronomy) The periodic change in the number of sunspots; the cycle is taken as the interval between successive
http://www.answers.com/topic/solar-cycle
It is a cycle that has 11-year intervals where the sun produces different levels of
http://www.chacha.com/question/what-is-a-solar-act...
Sunspots are caused by solar storms, including flares and coronal mass ejections, produced by the Sun's magnetic field. Galileo Galilei made the first European observations of these
http://www.ehow.com/info_8602979_do-solar-cycles-h...
2 Additional Answers
The solar cycle is when the Sun's magnetic field rotates a full 360 degrees, causing its poles to switch. A solar cycle only happens once every 22 years.
The solar cycle is what drives solar weather, and sometimes weather here on Earth (provided that's where you are right now!) It also can effect climate change. This is all done by the level of irradiation being changed.
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