Viewing archive of fredag, 12 februari 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 Feb 12 2200 UTC
Skapad av NOAA © SWPC och bearbetad av SpaceWeatherLive.com

USAF/NOAA rapport för sol- och geofysisk aktivitet

SDF Nummer 043 publicerat klockan 2200Z på 12 FEB 1999 ********CORRECTED COPY*********************************************

IA. Analys av solfläcksgrupper och solaktivitet från 11-2100Z till 12-2100Z

SOLAR ACTIVITY BECAME MODERATE. AN M1/1N FLARE ERUPTED IN REGION 8457 (N15E23) AT 12/0325Z. ASSOCIATED TYPE II/IV SWEEPS ALSO OCCURRED WITH MODERATE CENTIMETRIC BURSTS. A C5/SF ALSO OCCURRED IN THIS REGION AT 12/1527Z WHILE SLOW GROWTH WAS NOTED IN WHITE LIGHT BOTH IN AREA COVERAGE AND SPOT COUNT. FREQUENT LOW C-CLASS FLARES ALSO OCCURRED IN REGIONS 8456 (N23E04) AND 8458 (S23E29). THE DELTA CONFIGURATION IN REGION 8458 HAS FADED BUT THE REGION REMAINS COMPLEX WITH GOOD FLARE POTENTIAL. REGION 8456 APPEARED TO SIMPLIFY WITH SLIGHT DECAY OBSERVED IN WHITE LIGHT. FOUR NEW REGIONS WERE NUMBERED TODAY: REGIONS 8461 (S32E27), 8462 (N20E34), 8463 (S16E61), AND 8464 (N19E64). THE ADDITION OF THESE FOUR NEW REGIONS ON THE VISIBLE DISK RESULT IN A TOTAL OF EIGHT SPOTTED REGIONS EAST OF CENTRAL MERIDIAN. THE OFFICIAL 10.7CM FLUX FOR 12 FEB WAS 188 FLUX UNITS, MAKING IT THE HIGHEST OBSERVED 10.7CM FLUX SO FAR THIS CYCLE.
IB. Prognos för solaktivitet
SOLAR ACTIVITY IS EXPECTED TO CONTINUE AT MODERATE LEVELS. REGIONS 8457 AND 8458 HAVE GOOD POTENTIAL FOR M-CLASS FLARES. REGION 8456, THOUGH DECAYING SOMEWHAT, HAS POTENTIAL FOR AN ISOLATED M-CLASS EVENT.
IIA. Sammanfattning av geofysisk aktivitet 11-2100Z till 12-2100Z
THE GEOMAGNETIC FIELD WAS MOSTLY UNSETTLED TO ACTIVE WITH AN ISOLATED MINOR STORMING PERIOD DURING 12/06-09Z. THE INITIAL DISTURBANCE WAS ASSOCIATED WITH A CORONAL MASS EJECTION BUT A HIGH SPEED STREAM ASSOCIATED A FAVORABLY POSITIONED CORONAL HOLE IS LIKELY CAUSING THE DISTURBED CONDITIONS THIS PERIOD.
IIB. Prognos för geofysisk aktivitet
THE GEOMAGNETIC FIELD IS EXPECTED TO CONTINUE AT UNSETTLED TO ACTIVE CONDITIONS WITH A CHANCE OF AN ISOLATED MINOR STORMING PERIOD AT HIGH LATITUDES. EXPECT MOSTLY QUIET TO UNSETTLED CONDITIONS LATE IN THE PERIOD AS THE CURRENT DISTURBANCE SUBSIDES.
III. Chans för solutbrott från 13 FEB till 15 FEB
M-klass50%50%50%
X-klass20%20%20%
Proton10%15%15%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observerad       12 FEB 188
  Prognoserat   13 FEB-15 FEB  190/190/190
  90 Day Mean        12 FEB 141
V. Geomagnetiskt A-index
OBSERVED AFR/AP 11 FEB  016/016
ESTIMATED AFR/AP 12 FEB  025/020
PREDICTED AFR/AP 13 FEB-15 FEB  012/015-008/012-008/012
VI. Chanser för geomagnetisk aktivitet från 13 FEB till 15 FEB
A. Medelhöga breddgrader
Aktivt60%15%15%
Små stormförhållanden20%05%05%
Svåra stormförhållanden01%01%01%
B. Höga breddgrader
Aktivt70%20%20%
Små stormförhållanden25%10%10%
Svåra stormförhållanden01%01%01%

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