Viewing archive of Friday, 7 November 1997

Solar activity report

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.
Report of Solar-Geophysical Activity 1997 Nov 07 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 311 Issued at 2200Z on 07 NOV 1997

IA. Analysis of Solar Active Regions and Activity from 06-2100Z to 07-2100Z

SOLAR ACTIVITY WAS LOW. THE LARGEST (AND ONLY) C-CLASS FLARE OF THE PAST DAY WAS A C1/SF IN REGION 8103 (N22W33) AT 07/0926Z. THIS REGON IS GROWING SLOWLY BUT REMAINS A SMALL, RELATIVELY SIMPLE SUNSPOT GROUP. REGION 8100 (S19W77) HAS BEEN QUIET SINCE YESTERDAY'S MAJOR FLARE, ONLY PRODUCING A FEW SMALL SUBFLARES. THIS REGION APPEARS TO HAVE SIMPLIFIED CONSIDERABLY OVER THE PAST 24 HOURS; HOWEVER, ITS PROXIMITY TO THE WEST LIMB MAKES A COMPLETE ANALYSIS DIFFICULT.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW TO MODERATE. C-CLASS ACTIVITY IS POSSIBLE IN REGION 8103. REGION 8100 MAY PRODUCE ANOTHER MAJOR FLARE BEFORE ITS DISK DEPARTURE BUT THIS IS BECOMING LESS LIKELY.
IIA. Geophysical Activity Summary 06-2100Z to 07-2100Z
THE GEOMAGNETIC FIELD RANGED FROM QUIET TO SEVERE STORM LEVELS. MAJOR TO SEVERE STORM CONDITIONS WERE EXPERIENCED AT MOST STATIONS DURING THE 07/0000-0600Z PERIODS FOLLOWING AN INTERPLANETARY SHOCK ARRIVAL AND SUDDEN STORM COMMENCEMENT (SSC) AT 06/2252Z. THIS SHOCK IS PRESUMED TO BE RELATED TO THE X2/2B FLARE OF 04 NOV. THE GREATER THAN 10 MEV AND GREATER THAN 100 MEV PROTON EVENTS GENERATED FROM YESTERDAY'S X9/2B FLARE REMAIN IN PROGRESS. PROTON EVENT PARTICULARS: GREATER THAN 10 MEV START 06/1305Z AND PEAK (490 PFU) 07/0250Z; GREATER THAN 100 MEV START 06/1245Z AND PEAK (51 PFU) 06/1640Z. THE PCA CONTINUES IN PROGRESS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO BE MOSTLY UNSETTLED TO ACTIVE WITH ISOLATED STORM CONDITIONS DURING LOCAL NIGHTTIME. A SIGNIFICANT INCREASE IN GEOMAGNETIC ACTIVITY IS NOT EXPECTED FROM THE X9/2B FLARE DUE TO THE FLARE LOCATION AND THE PRESUMED DIRECTION OF THE ASSOCIATED CME. HOWEVER, IF THE SHOCK ENCOUNTERS THE EARTH TOMORROW, AS EXPECTED, GEOMAGNETIC ACTIVITY LEVELS MAY BRIEFLY BE ENHANCED TO ACTIVE TO STORM LEVELS. THE PROTON EVENTS ARE EXPECTED TO REMAIN IN PROGRESS THROUGH TOMORROW AS FLUXES SLOWLY RETURN TO BACKGROUND.
III. Event Probabilities 08 NOV to 10 NOV
Class M25%10%01%
Class X05%01%01%
Proton05%01%01%
PCAFIN PROGRESS
IV. Penticton 10.7 cm Flux
  Observed       07 NOV 094
  Predicted   08 NOV-10 NOV  090/085/080
  90 Day Mean        07 NOV 090
V. Geomagnetic A Indices
OBSERVED AFR/AP 06 NOV  013/012
ESTIMATED AFR/AP 07 NOV  030/045
PREDICTED AFR/AP 08 NOV-10 NOV  030/035-015/030-010/012
VI. Geomagnetic Activity Probabilities 08 NOV to 10 NOV
A. Middle Latitudes
Active20%20%10%
Minor storm25%10%05%
Major-severe storm10%05%01%
B. High Latitudes
Active20%20%10%
Minor storm25%10%05%
Major-severe storm10%05%01%

All times in UTC

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