[Aavso-sid-list] Ionosphere Disturbance April 10 2009

[Len Anderson]

   Interested if observers of  NWC 19.8 Khz or any other frquency  noted on April10 the sunrise effect followed approx one hour later wih the same trace pattern as the  sunrise effect   this would have been at approx 23 UT    There were Coronal  Holes about this time   Could this  be the cause ?
    Len Anderson  A91

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