ARRL

Search for Amateur Radio News

  • latest102910

    10/29/2010 | The K7RA Solar Update

    The daily sunspot number went all the way to 74 this week (on Tuesday, October 26), but the average sunspot number was down more than 5 points from the previous week, to 50.3. Sunspot numbers for October 21-27 were 34, 34, 43, 57, 57, 74 and 53, with a me
    Learn More

  • sunspot102210

    10/23/2010 | The K7RA Solar Update

    The average sunspot numbers for the week were up nearly 44 points to 55.6, while the average solar flux readings remained unchanged, at 84.9. For a few days, solar flux values rose above 90, but currently the projection from USAF and NOAA for solar flux o
    Learn More

  • latest101410.jpg

    10/15/2010 | The K7RA Solar Update

    Solar activity dropped again this week, although it is now gradually strengthening. The average daily sunspot numbers declined nearly 16 points to 11.7, and average daily solar flux dropped more than 5 points to 75.8. Over the next two weeks, the solar fl
    Learn More

  • sunspot092410

    09/24/2010 | The K7RA Solar Update

    The autumnal equinox occurred early yesterday, at 0309 UTC on September 23. Conditions were good this week, with sunspots visible every day -- and very little geomagnetic activity. The average daily sunspot numbers rose more than 24 points to 40 and the a
    Learn More

  • sunspot091610

    09/17/2010 | The K7RA Solar Update

    The average daily sunspot numbers dropped nearly 23 points to 15.6 this week, and geomagnetic indices were quiet. The average daily solar flux was 78.1, but the latest prediction from USAF and NOAA calls for rising solar flux values. The September 17-23 p
    Learn More

  • Sunspot081910

    08/20/2010 | The K7RA Solar Update

    Thanks so much to Tomas Hood, NW7US, who wrote last week’s bulletin while K7RA was in California at dance camp. Tomas writes the weekly propagation column for CQ magazine, and he has an excellent Web site devoted to propagation. Tomas mentioned that the A
    Learn More

  • Sunspot080610

    08/06/2010 | The K7RA Solar Update

    Sunspot numbers and solar flux declined this week, with the average daily sunspot numbers down more than 15 points to 20.3, and the average daily solar flux down nearly 4 points to 81.4. These are the numbers from last Thursday through this Wednesday, Jul
    Learn More

  • Sunspot072210

    07/23/2010 | The K7RA Solar Update

    Sunspot activity increased recently, although it is foolish to call this a trend, since solar activity has great variability. Sunspot group 1087 was visible for 13 days over July 9-21. In millionths of a solar hemisphere, its size was 30, 100, 120, 130, 7
    Learn More