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Solar activity report for 9/10/01

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  • b1blancer_29501
    After producing a host of lower level M-class flares, active sunspot group 9608 flirted with the X-class category yesterday when it fired off a powerful M-9.5
    Message 1 of 702 , Sep 10, 2001
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      After producing a host of lower level M-class
      flares, active sunspot group 9608 flirted with the
      X-class category yesterday when it fired off a powerful
      M-9.5 flare. It resulted in a moderate radio-blackout
      that lasted several hours. See the following link for
      a short film of the flare created from images from
      the SOHO satellite taken in the extreme UV range.
      <a href=http://www.spaceweather.com/images2001/09sep01/flare_eit_big.gif target=new>http://www.spaceweather.com/images2001/09sep01/flare_eit_big.gif</a> . A small coronal hole is approaching the sun's
      central meridian, which could send some high-speed solar
      wind gusts our way in 2 or 3 days.<br><br>The current
      solar and geomagnetic conditions are :<br><br>NOAA
      sunspot number : 217<br>SFI : 245<br>A index : 5<br>K
      index : <br><br>Solar wind speed : 286.1
      km/sec<br>Solar wind density : 9.1 protons/cc<br>Solar wind
      pressure : 1.0 nPa<br><br>IMF : 4.3 nT<br>IMF Orientation
      : 0.8 nT North<br><br>Conditions for the last 24
      hours :<br>Solar activity was moderate. The geomagnetic
      field was quiet to unsettled.<br><br>Forecast for the
      next 24 hours :<br>Solar activity will be moderate to
      high. The geomagnetic field will be quiet to
      unsettled.<br><br>Solar activity forecast :<br>Solar activity is expected
      to be moderate to high. Region 9608 and nearby
      neighboring regions have the potential to produce isolated
      major flares. <br><br>Geomagnetic actviity forecast
      :<br>Geomagnetic activity is expected to be predominantly quiet,
      with the possibility of isolated active conditions in
      response to coronal hole effects on day two and
      three.<br><br>Recent solar flare activity :<br>09-Sep-2001 2045Z M9.5
      <br>09-Sep-2001 1841Z M2.0 <br>09-Sep-2001 1526Z M2.2
      <br>09-Sep-2001 1516Z M3.4 <br>09-Sep-2001 1001Z M1.0
      <br>09-Sep-2001 0240Z M1.9 <br>08-Sep-2001 1923Z M1.1
      <br>08-Sep-2001 0457Z M1.2
    • b1blancer_29501
      On Feb 28th, the Interplanetary Magnetic Field swung to a strong south-pointing orientation. That, coupled with an elevated solar wind speed and density,
      Message 702 of 702 , Mar 1, 2002
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        On Feb 28th, the Interplanetary Magnetic Field
        swung to a strong south-pointing orientation. That,
        coupled with an elevated solar wind speed and density,
        triggered a G-1 class geomagnetic storm. The result was
        some high latitude aurora. See this link for a
        photgraph of aurora observed over Quebec :
        <a href=http://www.spaceweather.com/aurora/images/01mar02/Moussette2.jpg target=new>http://www.spaceweather.com/aurora/images/01mar02/Moussette2.jpg</a> . As of right now, there are 3 sunspot regions,
        namely 9839, 9842, and 9845, that appear to be capable
        of producing M-class flares. Regions 9839 and 9842
        are close to rotating out of view over the western
        limb of the solar disk. Sunspot region 9845, however,
        is close to the sun's central meridian. A rather
        large coronal hole is also approaching the sun's
        central meridian, and coming into an Earth-pointing
        position. High speed colar wind gusts are likely around the
        first of next week.<br><br>The current solar and
        geomagnetic conditions are :<br><br>NOAA sunspot number :
        153<br>SFI : 188<br>A index : 10<br>K index : 1<br><br>Solar
        wind speed : 372.3 km/sec<br>Solar wind density : 4.4
        protons/cc<br>Solar wind pressure : 1.1 nPa<br><br>IMF : 8.4
        nT<br>IMF Orientation : 0.7 nT North<br><br>Conditions for
        the last 24 hours : <br>Solar activity was low. The
        geomagnetic field was quiet to unsettled. Stratwarm Alert
        exists Friday.<br><br>Forecast for the next 24 hours
        :<br>Solar activity will be low to moderate. The geomagnetic
        field will be quiet to unsettled.<br><br>Solar Activity
        Forecast :<br>Solar activity is expected to be low to
        moderate for the next three days. Region 9845 is a
        possible source for isolated M-class
        flares.<br><br>Geomagnetic activity forecast :<br>Geomagnetic field activity
        is expected to be mainly quiet to unsettled, until
        the onset of high speed stream effects from a
        recurrent coronal hole begin to develop by day three of the
        forecast period. Isolated active conditions are
        anticipated thereafter.<br><br>Recent significant solar flare
        activity :<br>None
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