Viewing archive of Wednesday, 17 September 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 Sep 17 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 260 Issued at 2200Z on 17 SEP 1997IA. Analysis of Solar Active Regions and Activity from 16-2100Z to 17-2100Z SOLAR ACTIVITY WAS MODERATE. REGION 8084 (N22W88), NOW
DECAYED INTO A DRO GROUP OF 6 SPOTS AS IT NEARS THE WEST LIMB,
PRODUCED AN M1.7/SN FLARE AT 17/1143Z AND AN M1/SF FLARE AT
17/1803Z. THIS REGION ALSO PRODUCED A C3/SF FLARE AT 16/2222Z.
REGION 8085 (S25W72) MANAGED TO PRODUCE A C1/SF FLARE AS IT NEARED
THE WEST LIMB. THIS REGION IS NOW CLASSIFIED AS AN HAX SPOT GROUP.
REGION 8086 (N27E00) HAS ELONGATED BUT DECAYED SLIGHTLY OVER THE
PAST 24 HOURS AND WAS RELATIVELY QUIET. TWO UNCORRELATED C1 FLARES
WERE DETECTED AS WELL.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW.
REGION 8084 AND 8086 STILL HAVE A FAIR CHANCE OF C-CLASS FLARING AND
A SMALL CHANCE OF AN OCCASIONAL ISOLATED M-CLASS FLARE. REGION 8085
HAS A FAIR CHANCE OF C-CLASS FLARING.
IIA. Geophysical Activity Summary 16-2100Z to 17-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED AT ALL LATITUDES. THE
GREATER THAN 2 MEV ENERGETIC ELECTRON FLUX REMAINED AT HIGH LEVELS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO REMAIN QUIET TO UNSETTLED FOR THE ENTIRE FORECAST
PERIOD.
III. Event Probabilities 18 SEP to 20 SEP
| Class M | 10% | 10% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 17 SEP 093 Predicted 18 SEP-20 SEP 090/086/082 90 Day Mean 17 SEP 079
V. Geomagnetic A Indices
OBSERVED AFR/AP 16 SEP 007/009 ESTIMATED AFR/AP 17 SEP 005/008 PREDICTED AFR/AP 18 SEP-20 SEP 010/008-005/005-005/005
VI. Geomagnetic Activity Probabilities 18 SEP to 20 SEP
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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