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Solar Activity Report for 8/31/05

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  • David
    ** G-1 Geomagnetic Storm In Progress ** ** Aurora Watch In Effect ** You normally don t think of a 500 km/sec solar wind as something to kick up G-2
    Message 1 of 1 , Aug 31, 2005
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      ** G-1 Geomagnetic Storm In Progress **
      ** Aurora Watch In Effect **

      You normally don't think of a 500 km/sec solar wind as something to
      kick up G-2 geomagnetic storm, but that's what's happened within the
      last 24 hours. The solar wind density is higher than I've seen it in
      awhile, so that may have someting to do with it. The culprit is a
      relatively small coronal hole that's in an Earth pointing position.
      The effects are expected to last for the next three days. Also worthy
      of note today is a big, bright, full-halo CME. The originator of this
      event was a long-duration C-2 class flare. Remember, it isn't the
      size that matters, but how long it lasts. (Sorry, couldn't resist)
      The CME is expected to arrive on or about the 2nd. Major geomagnetic
      storm conditions are a possibility. Stay tuned. Three small sunspot
      regions are currently visible. None of them look to have the
      potential of generating a significant flare at the present time, but
      as we've just seen, it doesn't have to be a big flare to make things
      interesting.

      The current solar and geomagnetic conditions are :

      NOAA sunspot number : 48
      SFI : 83
      A index : 25
      K index : 5

      Solar wind speed : 503.1 km/sec
      Solar wind density : 7.7 protons/cc
      Solar wind pressure : 3.3 nPa

      IMF : 5.2 nT
      IMF Orientation : 2.5 nT South

      GOES-12 Background X-ray Flux level : A7

      Conditions for the last 24 hours :
      Space weather for the past 24 hours has been moderate. Geomagnetic
      storms reaching the G2 level occurred.

      Forecast for the next 24 hours :
      Space weather for the next 24 hours is expected to be minor.
      Geomagnetic storms reaching the G1 level are expected.

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

      Geomagnetic activity forecast :
      The geomagnetic field is expected to be at quiet to minor storm
      levels. A coronal hole may keep conditions elevated throughout the
      period. Isolated major storm conditions may be possible on 2 September
      due to the effects of the full halo CME from the long duration C2
      x-ray event that occurred today.

      Recent significant solar flare activity :
      None
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