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The K7RA Solar Update

ARRL

Well-Known Member
Nov 15, 2008
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At 0057 UTC on July 7, the Australian Space Forecast Centreissued a Geomagnetic Disturbance Warning: “Expect an increase in geomagneticactivity late on UT day, 08-09 July due to influence of geoeffective coronalhole.”

Our Sun showed no sunspots on July 3-4, so average daily sunspot numbersdropped from 20.3 on June 22-28 to 8 during the current reporting week, June 29through July 5. Average daily...

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