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  • 01/23/2009 | The K7RA Solar Update

    Monday revealed another shy sunspot. Sunspot 1011 appeared suddenly, and then it was gone. Its configuration and location did not identify it as belonging to either Solar Cycle 23 or 24. On Monday, January 19 the sunspot number was 13. Sunspot numbers for
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  • 12/19/2008 | The K7RA Solar Update

    Last week's sunspot group was only visible for three days, December 10-12. The average daily sunspot number for all of 2007 was 12.8; if we see no sunspots for the rest of 2008, the average for this year will be 4.7. By comparison, the yearly averages of
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  • 11/26/2008 | The K7RA Solar Update

    This is an early bulletin for the Thanksgiving holiday, as ARRL is closed on Friday, the regular day for release of this bulletin. We plan another brief regular propagation bulletin on Monday, December 1 that will contain the propagation numbers for Novem
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  • 11/21/2008 | The K7RA Solar Update

    The latest sunspot appearance lasted eight days; the spot passed from view after Monday, November 17. Geomagnetic indices have remained nice and quiet. If you look here for recent geomagnetic data, you will notice certain times which were extremely quiet
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  • 10/10/2008 | The K7RA Solar Update

    A familiar sight appeared this week, as a sunspot emerged for one day, then was gone. Based on its magnetic polarity and high position in our Sun's southern hemisphere, sunspot 1003 was a new Solar Cycle 24 sunspot; like all the other recent sunspots, it
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  • 07/25/2008 | The K7RA Solar Update

    For several days over the past week, we saw a couple of sunspots -- but just like other recent dying Solar Cycle 23 spots, they faded quickly. This group, lasting from July 18-20, was number 1000. No sign of Solar Cycle 24 in recent memory, just a couple
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  • 05/23/2008 | The K7RA Solar Update

    This week several new sunspots appeared for five days, but they were all leftover spots from Solar Cycle 23, not new Cycle 24 spots. But this is okay, because at the sunspot minimum we appreciate any spots we can get. May 16-20 saw daily sunspot numbers o
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  • 05/16/2008 | The K7RA Solar Update

    We've had another week with no sunspots. Our reporting week for this bulletin runs from Thursday through Wednesday, and this is the fifth bulletin of the year reporting zero sunspots for the week. The rest of the 16 bulletins had at least one day with sun
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