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Question about solar activity/sun spots


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I'm doing a little paper in my astronomy class and one thing I'm discussing are sun spots.  I know sun spots are used to determine how active (or inactive) solar activity is.  I've been searching google and reading some articles to answer my question but I have not had much luck.  Anyways, since how active solar activity is depends on the number of sunspots, what threshold is there that separates active periods from inactive periods?  Or how do you determine this?  

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I'm doing a little paper in my astronomy class and one thing I'm discussing are sun spots.  I know sun spots are used to determine how active (or inactive) solar activity is.  I've been searching google and reading some articles to answer my question but I have not had much luck.  Anyways, since how active solar activity is depends on the number of sunspots, what threshold is there that separates active periods from inactive periods?  Or how do you determine this?  

start with this site:  http://www.leif.org/research/

 

One of the world's preeminent scientists on solar activity.  If he were to talk to you, I believe he would say that sunspots are a good manifestation of solar activity, but that the two do not always follow linearly.

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start with this site:  http://www.leif.org/research/

 

One of the world's preeminent scientists on solar activity.  If he were to talk to you, I believe he would say that sunspots are a good manifestation of solar activity, but that the two do not always follow linearly.

 

Thank you!

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