Viewing archive of Thursday, 4 December 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 Dec 04 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 338 Issued at 2200Z on 04 DEC 1997IA. Analysis of Solar Active Regions and Activity from 03-2100Z to 04-2100Z SOLAR ACTIVITY WAS LOW. REGION 8113 (N21W28) PRODUCED
JUST ONE C-CLASS FLARE, A C1/SF WITH AN ASSOCIATED BRIGHT SURGE AT
04/0541UT. MINOR RADIO BURST AT 245 MHZ THROUGH 4995 MHZ ACCOMPANIED
THE EVENT. THE REGION HAS DECAYED SLIGHTLY IN SPOT COUNT, AREA, AND
MAGNETIC COMPLEXITY AND NOW HAS APPROXIMATELY 26 SPOTS MEASURING 420
MILLIONTHS IN WHITE LIGHT AREA. THE OTHER SPOTTED REGION 8114
(S30W08) WAS QUIET AND STABLE.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. REGION 8113, THOUGH SHOWING SIGNS OF DECAY, STILL HAS
POTENTIAL TO PRODUCE ISOLATED M-CLASS FLARES.
IIA. Geophysical Activity Summary 03-2100Z to 04-2100Z
THE GEOMAGNETIC FIELD WAS QUIET.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO REMAIN QUIET.
III. Event Probabilities 05 DEC to 07 DEC
| Class M | 50% | 50% | 50% |
| Class X | 05% | 05% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 04 DEC 107 Predicted 05 DEC-07 DEC 105/103/101 90 Day Mean 04 DEC 094
V. Geomagnetic A Indices
OBSERVED AFR/AP 03 DEC 006/006 ESTIMATED AFR/AP 04 DEC 004/005 PREDICTED AFR/AP 05 DEC-07 DEC 005/005-005/008-005/008
VI. Geomagnetic Activity Probabilities 05 DEC to 07 DEC
| 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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