Freckle.
Prominence Sunspot in 1945
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.
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 sunspot cycle is about 11 years in length.
A Large Sunspot can be up to about 10,000 miles across.
The average sunspot cycle is approximately 11 years, with periods of high sunspot activity followed by lower activity levels. This cycle is known as the solar cycle or the sunspot cycle.
Sunspots are dark circles on the sun's surface that are cooler than the area surrounding it. Another name for a sunspot is a solar variation or a dark spot.
An area on the sun that is cooler is called a sunspot.
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The Sun is rising close to its high, or peak sunspot cycle.
The center portion of a sunspot is called the umbra. It is the darkest part of the sunspot where the magnetic field is strongest and the temperature is cooler than the surrounding areas.
On July 14, 2007, the Sunspot number was 38. This was late in Solar Cycle 23. You can see the daily sunspot number and interesting astronomical phenomena at spaceweather.com.