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Solar Activity Report for 7/20/02

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  • b1blancer_29501
    ** Aurora Watch In Effect ** Well, the hits just keep on coming! The CME from the X-1 flare from July 18th struch Earth s magnetosphere late Friday. While it
    Message 1 of 1 , Jul 20, 2002
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      ** Aurora Watch In Effect **

      Well, the hits just keep on coming! The CME from the X-1 flare from
      July 18th struch Earth's magnetosphere late Friday. While it didn't
      trigger as much geomagnetic activity as one might have hoped, it did
      set off at least one aurora display which was seen over Quebec.
      http://www.spaceweather.com/aurora/images/20jul02/Moussette1.jpg .
      There may be more on the way. Late this afternoon a massive X-3 flare
      erupted. Ther's no data yet on which sunspot region it came from,
      although it appeared to originate from near the southeastern limb of
      the solar disk. There's also no information about whether there was a
      CME associated with the event. More will be known tomorrow. The
      flare looked like it was of a fairly long duration, which would make
      it more likely to fire off a CME. Coronal hole effects are adding to
      the general solar wind activity this evening.

      The current solar and geomagnetic conditions are :

      NOAA sunspot number : 136
      SFI : 185
      A index : 18
      K index : 4

      Solar wind speed : 593.5 km/sec
      Solar wind density : 4.0 protons/cc
      Solar wind pressure : 2.3 nPa

      IMF : 5.0 nT
      IMF Orientation : 4.2 nT South

      Conditions for the last 24 hours :
      Space weather for the past 24 hours has been strong. Geomagnetic
      storms reaching the G1 level occurred. Radio blackouts reaching the R3
      level occurred.

      Forecast for the next 24 hours :
      Space weather for the next 24 hours is expected to be minor. Radio
      blackouts reaching the R1 level are expected.

      Solar activity forecast :
      Solar activity is expected to be moderate. Regions 30 and 36 are good
      candidates for an isolated M-class event.

      Geomagnetic activity forecast :
      The geomagnetic field is expected to be at unsettled levels throughout
      the interval.

      Recent significant solar flare activity :
      20-Jul-2002 2130Z X3.3
      18-Jul-2002 0744Z X1.8
      18-Jul-2002 0337Z M2.2
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