Viewing archive of Sunday, 17 September 2000

Solar activity report

Report of Solar-Geophysical Activity 2000 Sep 17 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 261 Issued at 2200Z on 17 SEP 2000

IA. Analysis of Solar Active Regions and Activity from 16-2100Z to 17-2100Z

SOLAR ACTIVITY WAS LOW. THE LARGEST FLARE OF THE PAST DAY WAS A C5/1F AT 17/0643 UTC IN REGION 9167 (N11E69). THIS REGION ALSO PRODUCED A NUMBER OF OTHER LESS SIGNIFICANT SUBFLARES. 9167 IS STILL CLOSE TO THE EAST LIMB BUT APPEARS TO BE A GROWING D-TYPE GROUP. REGION 9165 (N14W26) CONTINUES TO DECAY IN SUNSPOT AREA AND MAGNETIC COMPLEXITY. HOWEVER, IT MANAGED TO PRODUCE SEVERAL C-CLASS SUBFLARES, THE LARGEST OF WHICH WAS A C3/SF AT 17/0042 UTC. REGION 9166 (S14E37) ALSO PRODUCE A FEW C-CLASS FLARES AND CONTINUES TO INCREASE IN COMPLEXITY AS IT ROTATES FURTHER ONTO THE DISK. NEW REGION 9168 (N09E06) EMERGED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW TO MODERATE. ADDITIONAL C-CLASS ACTIVITY IS EXPECTED IN REGIONS 9165, 9166, AND 9167. M-CLASS FLARES ARE POSSIBLE IN THESE REGIONS AS WELL. IIA. GEOPHYSICAL ACTIVITY SUMMARY 16/2100Z TO 17/2100Z: THE GEOMAGNETIC FIELD RANGED FROM QUIET TO STORM LEVELS. THE FIELD APPEARED TO BE UNDER THE INFLUENCE OF A HIGH-SPEED CORONAL HOLE STREAM FOR MOST OF THE DAY. ACE NEAR-REAL-TIME DATA SUGGESTS THE ARRIVAL OF CME MATERIAL AT L1 AT ABOUT 17/1500 UTC. THIS CME MAY HAVE BEEN ASSOCIATED WITH ACTIVITY IN REGION 9165 ON SEP 15.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO BE UNSETTLED TO ACTIVE, REACHING STORM LEVELS BY SEP 19. THE STRONGEST ACTIVITY IS EXPECTED FROM A CME RELATED TO THE M5/2B FLARE IN REGION 9165 EARLY ON SEP 16. A HIGH-SPEED CORONAL HOLE STREAM MAY MAINTAIN ACTIVITY LEVELS FOR A FEW DAYS AFTER THESE CMES PASS THE EARTH.
III. Event Probabilities 18 SEP to 20 SEP
Class M50%50%50%
Class X05%05%05%
Proton05%05%05%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       17 SEP 182
  Predicted   18 SEP-20 SEP  185/190/190
  90 Day Mean        17 SEP 177
V. Geomagnetic A Indices
OBSERVED AFR/AP 16 SEP  014/021
ESTIMATED AFR/AP 17 SEP  020/025
PREDICTED AFR/AP 18 SEP-20 SEP  020/020-040/040-030/040
VI. Geomagnetic Activity Probabilities 18 SEP to 20 SEP
A. Middle Latitudes
Active60%50%50%
Minor storm15%25%25%
Major-severe storm05%25%25%
B. High Latitudes
Active75%25%25%
Minor storm15%30%30%
Major-severe storm05%35%35%

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