Viewing archive of Thursday, 27 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 27 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 331 Issued at 2200Z on 27 NOV 1997IA. Analysis of Solar Active Regions and Activity from 26-2100Z to 27-2100Z SOLAR ACTIVITY WAS HIGH. REGION 8113 (N20E60) PRODUCED
AN X2/2B FLARE AT 27/1317Z. THIS FLARE WAS ASSOCIATED WITH A 350 SFU
RADIO BURST AT 2695 MHZ AND A TYPE II SWEEP. THIS REGION APPEARS TO
BE A MODERATE-SIZED COMPLEX E-TYPE SUNSPOT GROUP, ALTHOUGH LIMB
PROXIMITY STILL INHIBITS COMPLETE ANALYSIS. THIS REGION ALSO
GENERATED SEVERAL SMALL C-CLASS FLARES SINCE YESTERDAY. OTHER
REGIONS WERE QUIET.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE
MODERATE TO HIGH WITH REGION 8113 AS THE PRIMARY FLARE PRODUCER.
ANOTHER MAJOR FLARE IS POSSIBLE.
IIA. Geophysical Activity Summary 26-2100Z to 27-2100Z
THE GEOMAGNETIC FIELD WAS QUIET. THE GREATER THAN 2 MEV ELECTRON FLUX
WAS HIGH.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO REMAIN QUIET.
III. Event Probabilities 28 NOV to 30 NOV
| Class M | 60% | 60% | 60% |
| Class X | 10% | 10% | 10% |
| Proton | 02% | 02% | 02% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 27 NOV 111 Predicted 28 NOV-30 NOV 115/120/125 90 Day Mean 27 NOV 093
V. Geomagnetic A Indices
OBSERVED AFR/AP 26 NOV 004/003 ESTIMATED AFR/AP 27 NOV 003/003 PREDICTED AFR/AP 28 NOV-30 NOV 005/005-005/005-005/005
VI. Geomagnetic Activity Probabilities 28 NOV to 30 NOV
| 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% |
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