Solar Week - Ask a Question

Come here during Solar Week (next one: March 22-26, 2021) to interact. To post a question, click on your area of interest from the topics below, and then click on the "Ask New Question" button. Or EMAIL or tweet or plant in Answer Garden your question about the Sun or life as a scientist to us -- and watch for it to appear here.  You can also visit our FAQs (frequently asked questions). In between Solar Weeks in October and March, you can view all the archives here.

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Last Post 3/22/2013 10:26 AM by  Emilia Kilpua
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3/22/2013 8:13 AM

    I'm Alex Adams and im from California Area. IM in 8th grade. My question is How many solar flares happen each year?

    Emilia Kilpua

    New Member

    New Member

    3/22/2013 10:26 AM

    Hi Alex,

    Good question! This depends a lot on the flare intensity and the phase of the solar cycle. As well as on how strong the solar cycle is . For example from you can look how many flares have happened a certain (bottom of the page). C-class are weakest, M-class moderate flares and X-class the strongest flares (classification according to their X-ray output).

    During solar minimum strong and moderate flares occur very rarely, but very weak flares you can still see regularly. For example, during the recent minimum there were several years without strong flares. At solar maximum flares occur several times per day and strong ones often as well. During the on-going solar 24 there have been 15 X-ray flares so far (all in 2011 and 2012).

    Flares also occur quite irregularly. Sometimes there are long periods without much activity and then some strong active region appear and produce manyf big flares in a few days.


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