Viewing archive of Sunday, 18 January 1998
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 1998 Jan 18 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 018 Issued at 2200Z on 18 JAN 1998IA. Analysis of Solar Active Regions and Activity from 17-2100Z to 18-2100Z SOLAR ACTIVITY WAS VERY LOW. REGION 8136 (N16W51)
PRODUCED A B3/SF AT 18/1153Z. THE REMAINING ACTIVITY WAS LIMITED TO
OCCASIONAL OPTICALLY UNCORRELATED B-CLASS FLARES. REGION 8131
(S23W74) CONTINUES TO DECAY AS IT NEARS THE WEST LIMB. IT IS NOW A
FIVE SPOT CAO GROUP MEASURING 180 MILLIONTHS IN WHITE LIGHT AREA.
THE REMAINING REGIONS HAVE BEEN QUIET. SPACE-BASED CORONAGRAPH
IMAGERY INDICATED A HALO CORONAL MASS EJECTION (CME) OCCURRED NEAR
THE EAST LIMB AROUND 17/0600Z. THE MATERIAL APPEARS TO BE FLOWING
FROM BEHIND THE LIMB THUS MOSTLY EASTWARD DIRECTED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN
VERY LOW.
IIA. Geophysical Activity Summary 17-2100Z to 18-2100Z
THE GEOMAGNETIC FIELD WAS QUIET UNTIL AROUND 18/0700Z WHEN PERIODS OF
UNSETTLED TO ACTIVE CONDITIONS OCCURRED. NORTHERN LATITUDES
EXPERIENCED PERIODS OF MINOR STORMING. THE DISTURBANCE ENDED AT
ABOUT 18/1600Z AND CONDITIONS HAVE BEEN QUIET SINCE.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO REMAIN AT MOSTLY QUIET LEVELS.
III. Event Probabilities 19 JAN to 21 JAN
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 18 JAN 095 Predicted 19 JAN-21 JAN 095/096/097 90 Day Mean 18 JAN 096
V. Geomagnetic A Indices
OBSERVED AFR/AP 17 JAN 004/005 ESTIMATED AFR/AP 18 JAN 010/005 PREDICTED AFR/AP 19 JAN-21 JAN 005/005-005/005-005/005
VI. Geomagnetic Activity Probabilities 19 JAN to 21 JAN
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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