Vaata neljapäev, 27 august 1998 arhiivi

Päikese aktiivsuse aruanne

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.
Päikese ja geofüüsikalise aktiivsuse aruanne 1998 Aug 27 2200 UTC
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Ühine USAF / NOAA päikese- ja geofüüsikaalase aktiivsuse aruanne

::::::::::CORRECTED COPY ::::::::::::::: SDF number 239 Välja antud 2200Z kuni 27 AUG 1998

IA. Päikese aktiivsete piirkondade ja päikeseaktiivsuse analüüs alates 26-2100Z kuni 27-2100Z

SOLAR ACTIVITY HAS BEEN LOW. THE ONLY ACTIVITY HAS BEEN A C-CLASS X-RAY BURSTS AND SUBFLARES FROM REGIONS 8307 (N31W28) AND 8319 (N21W03). REGION 8307 CONTINUES ITS SLOW DECAY AND SIMPLIFICATION. FILAMENT ACTIVITY WITHIN THE REGION HAS DECREASED. REGION 8319 (N19W03) HAS CONTINUED TO GROW AND DEVELOP. IT IS STILL SIMPLE AND SMALL IN SPOT AREA, BUT THE PLAGE AREA HAS GROWN. SUBFLARES AND ARCH FILAMENT SYSTEMS INDICATE THE REGION IS STILL EMERGING. THE REGION IS CLOSE TO OLDER REGION 8314 (N16E03) AND IF DEVELOPMENT CONTINUES IN 8319, THE MERGER OF THE REGIONS MAY PRODUCE ACTIVITY AS A RESULT OF THEIR INTERACTION.
IB. Päikese aktiivsuse ennustus
SOLAR ACTIVITY IS EXPECTED TO BE LOW TO MODERATE. A SPORADIC CLASS M FLARE IS POSSIBLE FROM REGION 8307. THE DEVELOPING COMPLEX OF REGIONS 8314/8319 IS LIKELY TO PRODUCE FREQUENT SMALL FLARES WITH A LIKELIHOOD OF STRONGER ACTIVITY OVER THE NEXT SEVERAL DAYS.
IIA. Summaarne geofüüsikaline aktiivsus 26-2100Z kuni 27-2100Z
THE GEOMAGNETIC FIELD HAS BEEN AT UNSETTLED TO SEVERE STORM LEVELS. MID-LATITUDE K-INDICES REACHED 7 AND 8 BETWEEN 27/0300 UT AND 27/1200 UT. THE FORBUSH DECREASE THAT BEGAN LATE ON 25 AUGUST CONTINUES, WITH NEUTRON MONITOR COUNTING RATES FROM THULE DEPRESSED BY ABOUT 6 PERCENT TODAY. ACE REAL-TIME SOLAR WIND DATA HAS PROVIDED CONTINUOUS INFORMATION THROUGH THE PERIOD OF THE GEOMAGNETIC STORM. FROM 26/0600 UT THROUGH 26/2200 UT, THE ESTIMATED SOLAR WIND VELOCITY INCREASED STEADILY FROM ABOUT 400 KM/S TO APPROXIMATELY 900 KM/S, THEN DECLINED JUST AS STEADILY TO ABOUT 600 KM/S BY 27/0900 UT. AT THE SAME TIME, THE DENSITY REMAINED LESS THAN 10 /CM3 AND THE TEMPERATURE INCREASED FROM 500,000 K UP TO 1,000,000 K AT 26/2100 UT, THEN DOWN TO 20,000 AT 27/1300 UT. THE RESULT APPEARED TO BE A FAST, HOT, LOW-DENSITY STREAM. THE INTERPLANETARY BZ FIELD HAS REMAINED NEARLY FLAT AT ABOUT -10 TO -15 NANOTESLA MOST OF TODAY, BUT HAS SHOWN SIGNS OF MOVING TOWARD LESS NEGATIVE VALUES OVER THE PAST 6 HOURS. THE GREATER THAN 10 MEV PROTON FLUXES HAVE REMAINED ABOVE EVENT THRESHOLDS THROUGHOUT 27 AUGUST. THE GREATER THAN 100 MEV PROTON EVENT WAS DECLARED OVER AT 26/2050 UT. ENERGETIC ELECTRONS FLUXES GREATER THAN 2 MEV, AS MEASURED BY THE GOES SATELLITE AT GEOSYNCHRONOUS ORBIT, HAD DECREASED TO ABOUT 10 PFU EARLY ON 27 AUG AFTER PREVIOUSLY REACHING NEAR THE SEC ALERT THRESHOLD OF 1000 PFU ON PREVIOUS DAYS. SINCE 27/0900 UT, THE FLUXES HAVE BEEN INCREASING.
IIB. Geofüüsikalise aktiivsuse ennustus
GEOMAGNETIC ACTIVITY IS EXPECTED TO CONTINUE AT MINOR TO MAJOR STORM LEVELS BUT WITH DECLINING INTENSITY OVER THE NEXT 24 HOURS, REACHING ACTIVE TO MINOR STORM LEVELS BY THE END OF THE DAY TOMORROW. MID-LATITUDE K-INDICES ARE MOST LIKELY TO REACH VALUES OF 6 OR 7 DURING THE COMING WESTERN HEMISPHERE NIGHT TIME. ENERGETIC ELECTRON FLUXES GREATER THAN 2 MEV WILL REACH ALERT LEVELS BY THE TIME THIS FORECAST IS EFFECTIVE. THE GREATER THAN 10 MEV PROTON FLUXES ARE LIKELY TO CONTINUE THEIR SLOW DECLINE BUT REMAIN ABOVE EVENT THRESHOLDS WELL INTO 27 AUGUST. THE CURRENT FORBUSH DECREASE IS EXPECT TO CONTINUE TO DECLINE IN INTENSITY.
III. Sündmuste tõenäosus 28 AUGkuni 30 AUG
Klass M25%25%25%
Klass X10%10%10%
Prooton25%25%25%
PCAFGREEN
IV. Pikklaine 10.7 cm kiirgus
  Vaadeldud       27 AUG 135
  Prognoositud   28 AUG-30 AUG  135/135/135
  90 päeva keskmine        27 AUG 117
V. Geomagneetiline A-indeks
OBSERVED AFR/AP 26 AUG  028/039
ESTIMATED AFR/AP 27 AUG  084/107
PREDICTED AFR/AP 28 AUG-30 AUG  030/030-010/015-010/010
VI. Geomagnetilised aktiivsuse tõenäosused 28 AUG kuni 30 AUG
A. Keskmistel laiuskraadidel
Aktiivne30%40%40%
Väike torm30%10%10%
Suur-tõsine torm20%05%05%
B. Kõrgetel laiuskraadidel
Aktiivne30%40%40%
Väike torm40%10%10%
Suur-tõsine torm15%05%05%

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