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Solar Activity Report for 4/23/04

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  • David
    First, a SOHO satellite status update. SOHO has been successfully recovered from Emergency Sun Reacquisition (ESR) mode into Course Roll Pointing (CRP) mode.
    Message 1 of 1 , Apr 23 10:52 PM
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      First, a SOHO satellite status update. SOHO has been successfully
      recovered from Emergency Sun Reacquisition (ESR) mode into Course Roll
      Pointing (CRP) mode. The CRP mode was commissioned in '99 as part of
      the changes that enabled SOHO to function without gyroscopes. Is uses
      reaction wheel speed measurements to monitor and compensate for roll
      rate changes. The CRP mode was added to give SOHO an additional safety
      net and provide an intermediate step between normal mode and ESR mode.
      According to the SOHO website, SOHO will remain in this mode over the
      weekend.

      The background X-ray flux has rises significantly within the last 24
      hours, there's been an M-class flare, and G-1 geomagnetic storm
      conditions have been observed. My guess is that the geomagnetic storm
      was triggered by a persistent south-pointing Interplanetary magnetic
      field. If there was a CME associated with the flare, it wouldn't have
      had time to arrive yet. With SOHO not returning any new images until
      Monday at the earliest, there's no good way to tell if there's a CME
      on the way. The flare most likely originated from sunspot region 596,
      one of three numbered sunspot regions visible. The coronal hole I
      mentioned in my last report should be just about in an Earth-pointing
      position now. The solar wind gusts from it should arrive Monday or
      Tuesday.

      The current solar and geomagnetic conditions are :

      NOAA sunspot number : 63
      SFI : 115
      A index : 17
      K index : 2

      Solar wind speed : 430.5 km/sec
      Solar wind density : 4.8 protons/cc
      Solar wind pressure : 1.5 nPa

      IMF : 5.8 nT
      IMF Orientation : 4.7 nT South

      Conditions for the last 24 hours :
      Space weather for the past 24 hours has been minor. Geomagnetic storms
      reaching the G1 level occurred. Radio blackouts reaching the R1 level
      occurred.

      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 low to moderate. Region 596 remains
      capable of producing an isolated M-class event.

      Geomagnetic activity forecast :
      The geomagnetic field is expected to be quiet to unsettled with
      isolated active conditions possible.

      Recent significant solar flare activity :
      23-Apr-2004 2112Z M1.1
      22-Apr-2004 0219Z M1.2
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