Viewing archive of Tuesday, 17 February 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 Feb 17 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 048 Issued at 2200Z on 17 FEB 1998IA. Analysis of Solar Active Regions and Activity from 16-2100Z to 17-2100Z SOLAR ACTIVITY WAS LOW. REGION 8156 (S25W21) GENERATED
ONE C2/SF FLARE AT 17/0953Z, AND WAS ALSO THE LIKELY ORIGIN FOR AN
UNCORRELATED C1 EVENT AT 17/0351Z. REGION 8156 HAS REMAINED
RELATIVELY STABLE SINCE YESTERDAY AS A 24-SPOT EKI BETA GROUP. THE
FOUR ADDITIONAL ACTIVE REGIONS CURRENTLY ON THE VISIBLE DISK, 8157
(N22E11), 8158 (S21W03), 8160 (N22E11), AND 8161 (N25E40), ARE ALL
QUIET AND UNREMARKABLE.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW,
WITH A 50% CHANCE OF ADDITIONAL C-CLASS EVENTS FROM REGION 8156.
IIA. Geophysical Activity Summary 16-2100Z to 17-2100Z
THE GEOMAGNETIC FIELD HAS BEEN MOSTLY QUIET TO UNSETTLED FOR THE PAST
24 HOURS, WITH A SINGLE PERIOD OF ACTIVE CONDITIONS RECORDED AT HIGH
LATITUDES DURING THE INTERVAL 17/1200-1500Z.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE MOSTLY UNSETTLED FOR THE NEXT 24 HOURS, WITH THE
CHANCE FOR AN ISOLATED PERIOD OF ACTIVE CONDITIONS. CONDITIONS ON
DAYS TWO AND THREE ARE EXPECTED TO BE MOSTLY QUIET.
III. Event Probabilities 18 FEB to 20 FEB
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 17 FEB 105 Predicted 18 FEB-20 FEB 105/105/105 90 Day Mean 17 FEB 096
V. Geomagnetic A Indices
OBSERVED AFR/AP 16 FEB 001/003 ESTIMATED AFR/AP 17 FEB 007/008 PREDICTED AFR/AP 18 FEB-20 FEB 008/010-005/010-005/005
VI. Geomagnetic Activity Probabilities 18 FEB to 20 FEB
| 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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