ARRL

Search for Amateur Radio News

  • Sunspot061710

    06/18/2010 | The K7RA Solar Update

    The average daily sunspot numbers were up 2.5 points from last week, despite the fact that there were no sunspots at all this week on June 15-16. A new sunspot group 1082 emerged yesterday, June 17, and yielded a daily sunspot number of 14. A nice thing a
    Learn More

  • Sunspot061010

    06/11/2010 | The K7RA Solar Update

    With calmer solar activity, geomagnetic conditions were stable this week. The average daily sunspot numbers were down 7.6 points to 17.7, and the average daily solar flux dropped two points to 71. The average planetary A index declined 6.4 points to 7.9,
    Learn More

  • Sunspot060310

    06/04/2010 | The K7RA Solar Update

    The average daily sunspot numbers were up nine points to 25.3 for this week, compared to the May 20-26 period; the average daily planetary A index rose nearly 10 points to 14.3, and this rise in geomagnetic instability came with the increase in solar acti
    Learn More

  • Sunspot052810

    05/28/2010 | The K7RA Solar Update

    This weekend is the CQ WPX CW Contest and conditions may be a little rough. Our current sunspot group 1072 has reached the Sun’s western horizon and is shrinking, and to top it all off, what looked like a possible emerging spot on Wednesday was not to be.
    Learn More

  • Sunspot052010

    05/21/2010 | The K7RA Solar Update

    Eleven days with no sunspots, but something emerged late Thursday, and it may be the return of old sunspot group 1069. Sunspot group 1069 was visible from May 4-8 before disappearing over the horizon. The return of that sunspot gives a daily sunspot numbe
    Learn More

  • Sunspot051410

    05/14/2010 | The K7RA Solar Update

    This lack of sunspots is bothersome. Thursday -- May 13 -- is the fifth day in a row with no spots, and there is no sign of any change. The solar flux has been declining and is now below 70. The predicted solar flux for May 14-19 is 70, then 74 on May 20,
    Learn More

  • Sunspot050610

    05/07/2010 | The K7RA Solar Update

    Sunspots made a strong return this week -- and so did geomagnetic activity. The average daily solar flux increased 4.2 points to 79.6; on Wednesday, May 5, the daily sunspot number reached 77, the highest in nearly four years. The sunspot number hasn’t be
    Learn More

  • Sunspot041510

    04/16/2010 | The K7RA Solar Update

    Weakened sunspots faded this week, and we were buffeted with more geomagnetic instability, but without the dramatic geomagnetic storms of the previous week. The average daily sunspot numbers fell more than 20 points to 12.1, and the average solar flux dro
    Learn More