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How variable is the SUN

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davidjayjackson's picture
How variable is the SUN


 I never thought of the Sun as being a variable start? So I guess the question is how variable is it? 


From our own Mike

From our own Mike Simonsen.

Jim Jones, JJI

HNL's picture
How valuable is the sun or the data from the observations

Hi:  I was reminded how valuable it is when I attended the Solar Physics devision  meeting in Boston, Mass. Alot a folks doing research need the data.  I have also subsribed to the Sun-Earth connection website.  It is our nearest Star.  Without its' warmth. Where would we be?  Best HNL

lmk's picture
Not much!

The short answer - It is very slightly variable, but like all average mid-main sequence stars, they can be considered of essentially constant energy output. The major variation is the 11-year solar cycle, where the output varies by about one part in a thousand, or one milli-magnitude (0.001).

Mike LMK

davidjayjackson's picture
Mike, Thanks for the

Thanks for the clarification.


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