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Solar Activity Report for 9/11/02

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  • David
    Today s solar activity report is dedicated to the men, women, and children who lost their lives in the terrorist attacks of September 11, 2001. ** Aurora Watch
    Message 1 of 1 , Sep 11, 2002
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      Today's solar activity report is dedicated to the men, women, and
      children who lost their lives in the terrorist attacks of September
      11, 2001.

      ** Aurora Watch In Effect **

      Early Wednesday morning, the Earth entered a high-speed coronal hole
      generated solar wind stream, which persists tonight. The
      Interplanetary Magnetic Field swung south, and a G-2 class geomagnetic
      storm was the result. Aurora were spotted over northern Europe and
      the northern US. While that geomagnetic storm has since subsided,
      more activity is possible as long as the the Earth is inside the
      high-speed solar wind stream. On the sunspot front, sunspot region
      105 has become very well developed, and spans 17 Earth diameters from
      end to end. It has been active, generating 4 M-class flares in as
      many days. It is a possibility that a major will erupt from this
      sunspot region in the days ahead.

      The current solar and geomagnetic conditions are :

      NOAA sunspot number : 216
      SFI : 213
      A index : 23
      K index : 3

      Solar wind speed : 514.0 km/sec
      Solar wind density : 1.7 protons/cc
      Solar wind pressure : 0.7 nPa

      IMF : 6.7 nT
      IMF Orientation : 5.8 nT North

      Conditions for the last 24 hours :
      Space weather for the past 24 hours has been moderate. Geomagnetic
      storms reaching the G2 level occurred. Radio blackouts reaching the R1
      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. Radio blackouts
      reaching the R1 level are expected.

      Solar activity forecast :
      Solar activity is expected to be at moderate levels for the next three
      days. Region 105 is a likely source of further M-class activity.
      Regions 103 and 107 may become more active during the period and could
      produce M-class flares as well.

      Geomagnetic activity forecast :
      The geomagnetic field is expected to be mainly unsettled to active for
      the next 24-48 hours. Isolated minor storm conditions may also occur,
      especially at higher latitudes. Conditions are expected to be in the
      quiet to unsettled range by the end of the forecast period.

      Recent significant solar flare activity :
      11-Sep-2002 0735Z M2.2
      10-Sep-2002 1456Z M2.9
      09-Sep-2002 1752Z M2.1
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