Viewing archive of söndag, 21 november 1999

Solaktivitetsrapport

Any mentioned solar flare in this report has a scaling factor applied by the Space Weather Prediction Center (SWPC). Because of the SWPC scaling factor, solar flares are reported as 42% smaller than for the science quality data. The scaling factor has been removed from our archived solar flare data to reflect the true physical units.
Rapport för sol- och geofysisk aktivitet 1999 Nov 21 2200 UTC
Skapad av NOAA © SWPC och bearbetad av SpaceWeatherLive.com

USAF/NOAA rapport för sol- och geofysisk aktivitet

SDF Nummer 325 publicerat klockan 2200Z på 21 NOV 1999

IA. Analys av solfläcksgrupper och solaktivitet från 20-2100Z till 21-2100Z

SOLAR ACTIVITY INCREASED TO MODERATE LEVELS. REGION 8765 (S12W60) PRODUCED THREE M-CLASS FLARES, AN M1/1N AT 21/0014Z ASSOCIATED WITH A 280 SFU TENFLARE, AN M2/SN AT 21/1017Z, AND AN M3/2N AT 21/1820Z ASSOCIATED WITH A 270 SFU TENFLARE. THIS REGION SHOWED A SLIGHT DECREASE IN MAGNETIC FIELD INTENSITY, BUT REMAINED LARGE AND STRUCTURALLY COMPLEX, POSSIBLY INCLUDING A MAGNETIC DELTA CONFIGURATION WITHIN ITS INTERIOR SPOTS. REGION 8771 (S16E01) SHOWED A MAGNETIC DELTA CONFIGURATION WITHIN ITS TRAILER PORTION AND UNDERWENT MINOR DEVELOPMENT. IT PRODUCED AN M3/2B FLARE AT 20/2235Z ASSOCIATED WITH A TYPE II RADIO SWEEP (EST. VELOCITY 700 KM/SEC). REGION 8768 (N16W65) SHOWED A MINOR INCREASE IN SPOT COUNT DURING THE PERIOD AND PRODUCED ISOLATED SUBFLARES, NONE OF WHICH WERE ASSOCIATED WITH SIGNIFICANT X-RAY EMISSION. REGION 8766 (N18W36) DECAYED SLIGHTLY. THE REMAINING REGIONS WERE SMALL AND STABLE INCLUDING NEWLY NUMBERED REGIONS 8777 (S26E40) AND 8778 (S14E62).
IB. Prognos för solaktivitet
SOLAR ACTIVITY IS EXPECTED TO REMAIN AT MODERATE LEVELS. REGIONS 8765 AND 8771 ARE EXPECTED TO PRODUCE M-CLASS FLARES. THERE IS ALSO A CHANCE FOR A MAJOR FLARE, ESPECIALLY FROM REGION 8765.
IIA. Sammanfattning av geofysisk aktivitet 20-2100Z till 21-2100Z
GEOMAGNETIC FIELD ACTIVITY RANGED FROM QUIET TO MINOR STORM LEVELS. A BRIEF PERIOD OF ACTIVE TO MINOR STORM LEVELS OCCURRED AROUND 21/0600Z FOLLOWING A 3-HOUR PERIOD OF SUSTAINED SOUTHWARD IMF BZ. THE GEOMAGNETIC FIELD WAS AT QUIET TO UNSETTLED LEVELS DURING THE REST OF THE PERIOD. THE GREATER THAN 2 MEV ELECTRON FLUX BRIEFLY REACHED HIGH LEVELS LATE IN THE PERIOD.
IIB. Prognos för geofysisk aktivitet
GEOMAGNETIC FIELD ACTIVITY IS EXPECTED TO RANGE FROM QUIET TO ACTIVE LEVELS. ACTIVE LEVELS ARE POSSIBLE DURING 23 NOVEMBER DUE TO CORONAL HOLE EFFECTS. THE GREATER THAN 2 MEV ELECTRON FLUX IS EXPECTED TO BE AT MODERATE TO HIGH LEVELS.
III. Chans för solutbrott från 22 NOV till 24 NOV
M-klass80%80%80%
X-klass20%20%20%
Proton15%15%15%
PCAFYELLOW
IV. Penticton 10.7 cm Flux
  Observerad       21 NOV 210
  Prognoserat   22 NOV-24 NOV  195/185/170
  90 Day Mean        21 NOV 167
V. Geomagnetiskt A-index
OBSERVED AFR/AP 20 NOV  007/009
ESTIMATED AFR/AP 21 NOV  015/010
PREDICTED AFR/AP 22 NOV-24 NOV  012/015-015/018-012/015
VI. Chanser för geomagnetisk aktivitet från 22 NOV till 24 NOV
A. Medelhöga breddgrader
Aktivt25%35%25%
Små stormförhållanden10%15%10%
Svåra stormförhållanden01%01%01%
B. Höga breddgrader
Aktivt30%40%30%
Små stormförhållanden15%20%15%
Svåra stormförhållanden01%01%01%

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