ARRL

Search for Amateur Radio News

  • sunspot121109

    12/11/2009 | The K7RA Solar Update

    Finally! A sunspot appeared on Wednesday, December 9, giving us a daily sunspot number of 13, following 16 days of no sunspots. And on December 10, the sunspot number was 13. The new group is number 1034, and it is a Solar Cycle 24 spot, as all sunspots h
    Learn More

  • 12/04/2009 | The K7RA Solar Update

    Recent sunspot activity -- which ended on November 22 -- pushed up the moving average we've been tracking for several years. Because we have all the data for November, we now have the most recent 3-month average of daily sunspot numbers, which centers on
    Learn More

  • 09/25/2009 | The K7RA Solar Update

    This week we had a double-dose of good news: Right at the time of the autumnal equinox on Tuesday, September 22, sunspot 1026 -- a new Solar Cycle 24 sunspot -- came into view over the Sun's eastern horizon. We watched this emerge a week ago on the Sun's
    Learn More

  • 09/11/2009 | The K7RA Solar Update

    No new sunspot activity this week, and no emerging sunspots are visible on the far side of the Sun. Sunspot region 1025 (or 11025) that appeared over August 31 and September 1 faded more than a week ago, and the area in which it appeared has just rotated
    Learn More

  • 07/24/2009 | The K7RA Solar Update

    No new sunspots yet, but a big surprise this week with aurora and a geomagnetic storm: Sunspot activity peaked around 0300-0900 UTC on Wednesday July 22, with K index as high as 6. The planetary A index for the day was 24. You can see the K index variatio
    Learn More

  • 06/26/2009 | The K7RA Solar Update

    Two new sunspots appeared last week, numbered 1022 and 1023, and both were Solar Cycle 24 spots, with 1022 lasting through June 23 and 1023 until June 24. On June 24, geomagnetic indices were unsettled. Sunspot numbers for June 18-24 were 0, 0, 0, 12, 24,
    Learn More

  • 06/12/2009 | The K7RA Solar Update

    Sunspot numbers from May 31-June 5 ranged from 13 to 23, then the Sun was blank for two days, followed by sunspot numbers of 12 for both June 8 and 9. This fleeting sunspot was number 1020, and like last week's spot, 1020 had the magnetic signature of a n
    Learn More