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Solar Week - Ask a Question » Archives of previous runs of Solar Week » 2010 Apr 12-16 » Sunspots » Sunspots

Sunspots

Last post 10-17-2010 1:27 PM by Emilia Kilpua. 1 replies.
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  • 04-16-2010 8:35 AM

    Sunspots

    Reply Contact

    Mike (cc)

    Whats the record for the most sunspots seen on the sun at one time?

  • 10-17-2010 1:27 PM In reply to

    • Emilia Kilpua
    • Top 10 Contributor
    • Joined on 03-11-2008
    • University of Helsinki, Finland
    • Posts 61

    Re: Sunspots

    Reply Contact

    Hi Mike!

     

    According to statistics in Solar Influences Data Analysis Center (SIDC) http://sidc.oma.be/ the highest daily sunspot number reported since 1818 was 355 and occurred on 24-25 December 1957. This time was around the maximum of solar cycle 19 that had also the highest monthly sunspot number (201) since mid 1700s.

     

    The sunspot number listed in SIDC does not indicate the number of individual sunspots but a “relative sunspot number” that takes into account the total number of individual spots, sunspot groups and efficiency of the observatory.

     
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