ARRL

Search for Amateur Radio News

  • latest041913.jpg

    04/19/2013 | The K7RA Solar Update

    While solar activity weakened this past week, geomagnetic conditions were stable. The geomagnetic storm predicted for last weekend did not happen, and both the planetary and mid-latitude A index only rose to 10 on April 14 in response to a glancing blow f
    Learn More

  • latest111612

    11/16/2012 | The K7RA Solar Update

    There has been an exciting and dramatic rise in sunspot activity this week. The daily sunspot number was 188 on Monday, November 12 -- higher than it has been in more than a year.
    Learn More

  • latest021612

    02/17/2012 | The K7RA Solar Update

    We are more than halfway through the winter season, and today -- February 17 -- is 58 days after the winter solstice. Propagation should improve as we approach the vernal equinox on March 20, which is just 32 days from now. Solar activity is still in the
    Learn More

  • latest092911

    09/30/2011 | The K7RA Solar Update

    Our Sun has been very active this past week, with the average solar flux rising nearly 12 points to 155.5, while the average daily sunspot numbers dropped nearly 41 points to 96.1. This implies fewer, but more intense, sunspots. Sunspot numbers for Septem
    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

  • 10/17/2008 | The K7RA Solar Update

    Finally, we are seeing Solar Cycle 24 sunspots that don't emerge on one day, only to evaporate the next. That's right -- sunspots, as in two or more. On Friday, October 10, sunspot 1005 emerged at high latitude over our Sun's eastern limb; that day's suns
    Learn More

  • 09/19/2008 | The K7RA Solar Update

    Last week saw another brief sunspot appearance followed by a quick fade. This was an old Solar Cycle 23 spot -- number 1001 -- resulting in a sunspot number of 12 for September 11. Sunspot numbers for September 11-17 were 12, 0, 0, 0, 0, 0 and 0 with a me
    Learn More