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2433Solar Activity Report for 4/21/05

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  • David
    Apr 21, 2005
      The Earth has moved inside of a high-speed solar wind stream coming
      from a coronal hole. There was a brief G-1 geomagnetic storm at the
      onset off the event, but conditions have quieted for the time being.
      However, that could change, and the prediction is that the activity
      level will increase over the next 48 hours. None of the two sunspot
      regions currently visible appear to have the potential for touching
      off a significant flare at this time. SOHO satellite solar magnetic
      analysis shows what could be a fairly large sunspot region on the back
      side of the sun.

      The current solar and geomagnetic conditions are :

      NOAA sunspot number : 22
      SFI : 77
      A index : 5
      K index : 2

      Solar wind speed : 452.2 km/sec
      Solar wind density : 4.7 protons/cc
      Solar wind pressure : 1.6 nPa

      IMF : 7.8 nT
      IMF Orientation : 0.2 nT North

      GOES-12 Background X-ray Flux level : A1

      Conditions for the last 24 hours :
      No space weather storms were observed for the past 24 hours.

      Forecast for the next 24 hours
      No space weather storms are expected for the next 24 hours.

      Solar activity forecast :
      Solar activity is expected to be very low.

      Geomagnetic activity forecast :
      The geomagnetic field is expected to be quiet to unsettled early on 22
      April. A geoeffective coronal hole high speed stream is expected to
      increase conditions later in the day. Unsettled to active with minor
      storm periods are possible late on 22 April continuing into early 23
      April. Conditions are expected to settle down on 24 April to mostly
      quiet to unsettled.

      Recent significant solar flare activity :