Viewing archive of Thursday, 11 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 11 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 254 Issued at 2200Z on 11 SEP 1997IA. Analysis of Solar Active Regions and Activity from 10-2100Z to 11-2100Z SOLAR ACTIVITY WAS VERY LOW. NO SIGNIFICANT FLARES
OCCURRED. REGIONS 8083 (S28W48), 8084 (N22W13), AND 8085 (S26E15)
HAVE ALL REMAINED RELATIVELY STABLE AND QUIET SINCE YESTERDAY.
REGION 8085 CONTINUES TO BE THE MOST COMPLEX AS A 25-SPOT 'FKI'
BETA-GAMMA GROUP. IN ADDITION, NEW REGION 8086, A SIMPLE 'BXO' BETA
GROUP, WAS NUMBERED TODAY AS IT ROTATED AROUND THE EAST LIMB.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. THE PROBABILITY FOR C-CLASS X-RAY EVENTS REMAINS HIGH
FOR REGIONS 8083, 8084, AND 8085, WITH THE POSSIBILITY FOR AN
ISOLATED M-CLASS EVENT FROM REGION 8085.
IIA. Geophysical Activity Summary 10-2100Z to 11-2100Z
THE GEOMAGNETIC FIELD HAS BEEN QUIET TO UNSETTLED FOR THE PAST 24
HOURS, EXCEPT FOR A SINGLE PERIOD OF ACTIVE CONDITIONS RECORDED AT
MIDDLE LATITUDES DURING THE INTERVAL 10/2100-2400Z. THE GREATER THAN
2 MEV ELECTRON FLUX RANGED FROM MODERATE TO HIGH.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED FOR THE NEXT 24 HOURS, WITH
UNSETTLED TO ACTIVE CONDITIONS ON DAY TWO, AND MOSTLY UNSETTLED ON
DAY THREE.
III. Event Probabilities 12 SEP to 14 SEP
| Class M | 30% | 30% | 30% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 11 SEP 109 Predicted 12 SEP-14 SEP 105/105/102 90 Day Mean 11 SEP 078
V. Geomagnetic A Indices
OBSERVED AFR/AP 10 SEP 017/019 ESTIMATED AFR/AP 11 SEP 010/012 PREDICTED AFR/AP 12 SEP-14 SEP 015/015-015/015-010/010
VI. Geomagnetic Activity Probabilities 12 SEP to 14 SEP
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 30% | 15% |
| Minor storm | 10% | 15% | 05% |
| Major-severe storm | 06% | 06% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 30% | 15% |
| Minor storm | 10% | 15% | 05% |
| Major-severe storm | 06% | 06% | 01% |
All times in UTC
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