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  • sunspot082710

    08/27/2010 | The K7RA Solar Update

    This week, we saw three days -- August 21-23 -- with no sunspots, and the average daily sunspot numbers for the week -- August 19-25 -- declined over 28 points to 8, compared to the previous week. The average daily solar flux was down more than 8 points t
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  • 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
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  • 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
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  • 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
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  • Sunspot071510

    07/16/2010 | The K7RA Solar Update

    Two new sunspot groups appeared in the last week -- groups 1087 and 1088. Group 1088 lasted just one day -- on July 13, 2010 -- with a relative area of 10 (millionths of a solar hemisphere). Sunspot group 1087 had a relative area from July 9-15 of 30, 100
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  • Sunspot070910

    07/10/2010 | The K7RA Solar Update

    The average daily sunspot numbers for this week rose from 11.7 to 16, back to the level from two weeks ago. The geomagnetic indices have quieted down, with average mid-latitude A index dropping over five points from the previous week. Sunspot numbers for
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  • Sunspot070110

    07/02/2010 | The K7RA Solar Update

    Most stations reported not-so-great conditions for ARRL Field Day last weekend, but there were sporadic-E openings on 6 and 10 meters. Geomagnetic conditions were a bit rough, with the Planetary A index in double digits for both days, June 26-27. Conditio
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  • Sunspot062410

    06/25/2010 | The K7RA Solar Update

    Sunspot numbers were lower for the past week, compared to the previous period. The average daily sunspot numbers fell nearly 11 points to 16.1. Sunspot numbers for June 17-23 were 14, 16, 28, 13, 14, 14 and 14, with a mean of 16.1. The 10.7 cm flux was 70
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