Viewing archive of fredag, 31 juli 1998

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 1998 Jul 31 2200 UTC
Skapad av NOAA © SWPC och bearbetad av SpaceWeatherLive.com

USAF/NOAA rapport för sol- och geofysisk aktivitet

SDF Nummer 212 publicerat klockan 2200Z på 31 JUL 1998

IA. Analys av solfläcksgrupper och solaktivitet från 30-2100Z till 31-2100Z

SOLAR ACTIVITY WAS LOW. THREE NOTABLE FLARES OCCURRED. THE FIRST WAS A C1 PEAKING AT 31/0345Z AND WAS ASSOCIATED WITH MODERATE INTENSITY TYPE II/IV SWEEP EVENTS. ALTHOUGH NO OPTICAL FLARE REPORTS WERE RECEIVED, ENHANCED PLAGE OBSERVED IN REGION 8280 (S24W54) SHORTLY AFTER THIS FLARE MAY SUGGEST ITS ORIGIN. THE SECOND FLARE OF NOTE WAS A LONG-DURATION C2/2F AT 31/0538Z IN REGION 8283 (N27E16). THIS FLARE WAS ASSOCIATED WITH A 12 DEGREE DSF AND STRONG TYPE II SWEEP. THE THIRD FLARE WAS A B7 AT 31/1540Z ASSOCIATED WITH FILAMENT ACTIVATION AND PARTIAL ERUPTION IN REGION 8282 (N30W48). NEW REGIONS 8289 (N22W63), 8290 (N17E63), AND 8291 (S23E09) WERE NUMBERED. REGION 8290 PRODUCED THE ONLY OTHER OPTICAL FLARE REPORTED, A SF (NO X-RAY OUTPUT) AT 31/1605Z.
IB. Prognos för solaktivitet
SOLAR ACTIVITY IS EXPECTED TO BE VERY LOW TO LOW. FLARES ARE POSSIBLE IN REGIONS 8280, 8282, AND 8290. REGION 8282 MAY PRODUCE AN ISOLATED M-CLASS FLARE BEFORE ITS DISK DEPARTURE.
IIA. Sammanfattning av geofysisk aktivitet 30-2100Z till 31-2100Z
THE GEOMAGNETIC FIELD RANGED FROM QUIET TO STORM LEVELS. ACE RTSW DATA SUGGESTS THAT THE EARTH'S MAGNETOSPHERE IS REACTING TO SEVERAL HOURS OF SOLAR WIND CHARACTERIZED BY HIGH DENSITY (20-70 P/CC), SLIGHTLY ENHANCED SPEED (420 KM/S), AND VARIABLE BZ (+/- 12 NT). THE NATURE OF THIS STRUCTURE (TRANSIENT OR NOT) IS NOT CLEAR FROM THE AVAILABLE DATA.
IIB. Prognos för geofysisk aktivitet
THE GEOMAGNETIC FIELD IS EXPECTED TO BE UNSETTLED TO ACTIVE FOR THE NEXT 24 HOURS, BECOMING QUIET TO UNSETTLED BY THE END OF THE FORECAST PERIOD. THE SOLAR EVENTS WHICH WERE OBSERVED TODAY (DSFS AND TYPE II/IV SWEEPS) MAY INDICATE THE OCCURRENCE OF CMES WHICH COULD AFFECT ACTIVITY LEVELS AT THE END, OR JUST OUTSIDE, OF THE 3-DAY FORECAST PERIOD.
III. Chans för solutbrott från 01 AUG till 03 AUG
M-klass15%10%05%
X-klass01%01%01%
Proton01%01%01%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observerad       31 JUL 114
  Prognoserat   01 AUG-03 AUG  112/110/108
  90 Day Mean        31 JUL 110
V. Geomagnetiskt A-index
OBSERVED AFR/AP 30 JUL  011/012
ESTIMATED AFR/AP 31 JUL  024/025
PREDICTED AFR/AP 01 AUG-03 AUG  015/015-010/012-010/015
VI. Chanser för geomagnetisk aktivitet från 01 AUG till 03 AUG
A. Medelhöga breddgrader
Aktivt20%15%15%
Små stormförhållanden10%01%01%
Svåra stormförhållanden05%05%05%
B. Höga breddgrader
Aktivt25%15%15%
Små stormförhållanden15%05%05%
Svåra stormförhållanden10%05%05%

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