Viewing archive of Thursday, 26 August 1999

Solar activity report

Report of Solar-Geophysical Activity 1999 Aug 26 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 238 Issued at 2200Z on 26 AUG 1999

IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z

SOLAR ACTIVITY WAS LOW WITH ONLY C-CLASS EVENTS DURING THE PERIOD. THE STRONGEST C-CLASS EVENT WAS AN OPTICALLY UNCORRELATED C7 AT 26/0705Z. REGION 8674 (S25W03) HAD SIGNIFICANT GROWTH IN THE NUMBER OF SPOTS THROUGHOUT THE REGION. REGIONS 8675 (N18E53) AND 8677 (N04E60) BOTH DISPLAYED MINOR GROWTH. NEW REGION 8679 (S34E58) WAS NUMBERED TODAY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW TO MODERATE. REGION 8673 (S19W08) OR 8674 IS CAPABLE OF PRODUCING AN M-CLASS EVENT. IIA. GEOPHYSICAL ACTIVITY SUMMARY FROM 25/2100Z TO 26/2100Z: THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED WITH PERIODS OF ACTIVE CONDITIONS IN THE HIGHER LATITUDES.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO BE QUIET TO UNSETTLED WITH THE POSSIBILITY OF ISOLATED ACTIVE PERIODS.
III. Event Probabilities 27 AUG to 29 AUG
Class M60%60%60%
Class X05%05%05%
Proton01%01%01%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       26 AUG 222
  Predicted   27 AUG-29 AUG  220/215/215
  90 Day Mean        26 AUG 166
V. Geomagnetic A Indices
OBSERVED AFR/AP 25 AUG  008/008
ESTIMATED AFR/AP 26 AUG  010/015
PREDICTED AFR/AP 27 AUG-29 AUG  010/012-010/010-008/010
VI. Geomagnetic Activity Probabilities 27 AUG to 29 AUG
A. Middle Latitudes
Active25%25%20%
Minor storm05%05%05%
Major-severe storm01%01%01%
B. High Latitudes
Active30%30%25%
Minor storm10%10%05%
Major-severe storm01%01%01%

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