SETI [ASTRO] FLARE FROM RETURNING 8545 (fwd)


Larry Klaes (lklaes@bbn.com)
Fri, 11 Jun 1999 15:54:55 -0400


>X-Authentication-Warning: brickbat12.mindspring.com: majordom set sender to owner-astro using -f >Date: Fri, 11 Jun 1999 15:12:38 -0300 (ADT) >From: Michael Boschat <andromed@ATM.DAL.CA> >To: ASTRO <astro@lists.mindspring.com> >Subject: [ASTRO] FLARE FROM RETURNING 8545 (fwd) >Sender: owner-astro@brickbat12.mindspring.com >Reply-To: Michael Boschat <andromed@ATM.DAL.CA> > >JUNE 11, 1999 1600 UT > >SOLAR ALERT > > HELIOSYNOPTICS, BOULDER, COLORADO > > >FLARE AT N40 ELIMB 11/1153 VERIFIES WARNING FOR MAJOR ACTIVITY FROM >HIGH-LATITUDE REGION 8545, NOW RETURNING FOR SECOND DISK PASSAGE. > > >AT THIS HOUR BRILLIANT LOOP PROMINENCS ARE RISING ABOVE THE NE SOLAR LIMB >AS POST-FLARE ACTIVITY, INDICATING THE PRESENCE OF A STRONG BIPOLAR PAIR OF >SUNSPOTS ARRANGED NORTH-SOUTH, SUGGESTING A DELTA CONFIGURATION. PROTONS >MAY ARRIVE FROM EVEN THIS OVER-THE-LIMB EVENT, AND ARE EVER MORE LIKELY AS >THIS REGION ROTATES FULLY INTO VIEW. > >VERY ACTIVE PROMINENCES NORTH OF THIS REGION YESTERDAY GAVE EARLY >INDICATION OF FLARE POTENTIAL BUT COULD NOT BE ANALYZED FOR A CONFIDENT >FORECAST. > >THE XRAY FLARE WAS ONLY C8 INTENSITY, BUT IS OF LONG DURATION. THE POST >FLARE LOOPS ARE CLEARLY THE TOPS OF A SYSTEM THAT IS ROOTED SOME DISTANCE >BEYOND THE LIMB. THIS MEANS THE FLARE MAGNITUDE IS NOT FULLY OBSERVED, >SUGGESTING THIS EVENT WAS INTRINSICALLY CLASS-M OR BETTER. > >THE LONGITUDE OF THIS MAJOR ACTIVE REGION IS EVEN FARTHER EAST THAN >PROJECTED FROM LAST MONTH'S PROPER MOTIONS, GIVING CONFIRMATION THAT IT IS >FOLLOWING THE BEHAVIOR OF THE JUNE 1991 SUPER-REGION DESCRIBED IN THE MAY >20 HELIOSYNOPTICS ALERT. THE ABNORMALLY-SLOW RATE OF SOLAR ROTATION FOR >THIS REGION IS MUCH LIKE THE 1991 EXAMPLE. > >THE GREAT 1991 REGION WAS QUIET ON ITS FIRST DISK PASSAGE, MODERATELY >ACTIVE ON ITS SECOND DISK PASSAGE, AND SET THE ALL-TIME RECORD FOR XRAY >FLARE PRODUCTION DURING ITS THIRD DISK TRANSIT IN JUNE 1991. > > > >Patrick S. McIntosh >HelioSynoptics and >McIntosh Squared Graphics >3885 Paseo del Prado >Boulder, CO 80301-1527 >303-444-5880 FAX: 303-440-0102 > >



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