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Last Post 10/18/2012 2:58 PM by  Yan Li
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10/16/2012 11:48 AM

    Drk (SRE)

    Q # 2.

    How long does it take the Sun to get sunspots after they're gone?

    Tags: Period of Solar Activity

    KD Leka

    Basic Member

    Basic Member

    10/16/2012 5:10 PM


    Each group of sunspots lives between a few days and a few weeks, sometimes up to a few months. So during the time when there are a lot of sunspots on the Sun, each individual group is probably only a few weeks old, and they 'fizzle out' and then new ones appear. For a few years there will be lots of sunspot groups (during "solar maximum" of the activity cycle -- cycle means it comes & goes), and then for a few years there will be few or no sunspot groups (during "solar minimum).

    You can see the variation by playing with some of the websites where data are saved from many years, such as or, by entering and looking at the images of the Sun over the course of many years, and see how the number of sunspot groups changes.



    Yan Li

    New Member

    New Member

    10/18/2012 2:58 PM
    Hi, Sunspot cycle is about 11 years on average, but ranging from 9 to 14 years. During solar activity minimum (usually about i year), there is few spots, then the solar cycle goes into the rising phase, and it takes about about 3 years to reach solar maximum, when there are lots of sunspots. Then the Sun goes into the declining phase and takes about 5 years or more to another minimum. Scientists thing the sunspots cycle is made by the dynamo effect due to the differential rotation of the magnetized Sun. Yan
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