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.
11 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.
On average, each sunspot cycle takes about 11 years. Some are longer, and some shorter.
The most obvious solar cycle the sunspot cycle, of roughly 11 years (on average - the length of an actual cycle may vary). Once in every sunspot cycle, the Sun's magnetic field reverses (north become south, and south becomes north), so a full cycle (for north to be back where it started) is twice the sunspot cycle.
11 years in average.
11 years
The sunspot cycle is about 11 years in length.
The amount of magnetic flux that rises up to the Sun's surface varies with time in a cycle called the solar cycle. This cycle lasts 11 years on average. This cycle is sometimes referred to as the sunspot cycle.
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.)
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.
On average, each sunspot cycle takes about 11 years. Some are longer, and some shorter.
The Sun is rising close to its high, or peak sunspot cycle.
The most obvious solar cycle the sunspot cycle, of roughly 11 years (on average - the length of an actual cycle may vary). Once in every sunspot cycle, the Sun's magnetic field reverses (north become south, and south becomes north), so a full cycle (for north to be back where it started) is twice the sunspot cycle.
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The cycle of sunspot activity.
The cycle of sunspot activity.