http://en.wikipedia.org/wiki/Sunspot_cycle The definition for sunspot cycle is "the recurring increase and decrease in the number of sunspots over a period averaging about eleven years."
The sunspot cycle is about 11 years in length.
The sunspot cycle is about 11 years long. This can vary somewhat; the current cycle has had an extended minimum with very few sunspots for about 3 years, and even now the sunspot numbers are very low for this point in the cycle.
11 years
Sunspot maximum and sunspot minimum are the points in time (roughly 6 years apart) when the sun is producing the most, or the least sunspots. In the past this has been measured both by sunspot area and sunspot count and is directly tied to the solar magnetic cycle.
The average length of the sunspot cycle is 11 years. Some cycles are double peaked, which makes it difficult to determine when one ends and when another one begins.
The sunspot cycle is about 11 years in length.
The Sun is rising close to its high, or peak sunspot cycle.
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The cycle of sunspot activity.
The cycle of sunspot activity.
The sunspot cycle is about 11 years long. This can vary somewhat; the current cycle has had an extended minimum with very few sunspots for about 3 years, and even now the sunspot numbers are very low for this point in the cycle.
11 years in average.
11 years
Sunspot maximum and sunspot minimum are the points in time (roughly 6 years apart) when the sun is producing the most, or the least sunspots. In the past this has been measured both by sunspot area and sunspot count and is directly tied to the solar magnetic cycle.
Every 11 years. The entire solar magnetic cycle takes about 22 years; twice in this cycle there is a sunspot maximum.
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About 11 years on average - but there are large variations in the length of individual cycles. Once each sunspot cycle, the magnetic field on the Sun reverts - so the real (underlying) cycle is about 22 years. (It takes two sunspot cycles for the magnetic field to go back to the original position.)