Viewing archive of Friday, 27 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 27 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 058 Issued at 2200Z on 27 FEB 1998IA. Analysis of Solar Active Regions and Activity from 26-2100Z to 27-2100Z SOLAR ACTIVITY WAS VERY LOW. THREE NEW REGIONS WERE
NUMBERED TODAY: REGION 8169 (S20W44) IS A 3-SPOT BXO BETA, REGION
8170 (N00E02) IS A 1-SPOT AXX, AND REGION 8171 (S214E05) IS A 3-SPOT
BXO BETA. REGION 8164 HAS DECREASED IN SIZE TO 90 MILLIONTHS,
BUT REMAINS THE LARGEST AND MOST ACTIVE REGION.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE VERY
LOW TO LOW. SEVERAL NEW REGIONS HAVE BEEN NUMBERED, AND BEGIN TO
GROW. REGION 8164 RETAINS THE ABILITY TO PRODUCE C-CLASS ACTIVITY.
IIA. Geophysical Activity Summary 26-2100Z to 27-2100Z
GEOMAGNETIC ACTIVITY HAS BEEN QUIET TO UNSETTLED.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO REMAIN MOSTLY QUIET FOR THE NEXT 24 HOURS.
UNSETTLED CONDITIONS ARE EXPECTED FOR THE REMAINDER OF THE PERIOD WITH
A SMALL CHANCE FOR ACTIVE PERIODS AT HIGHER LATITUDES.
III. Event Probabilities 28 FEB to 02 MAR
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 27 FEB 090 Predicted 28 FEB-02 MAR 090/090/090 90 Day Mean 27 FEB 096
V. Geomagnetic A Indices
OBSERVED AFR/AP 26 FEB 000/003 ESTIMATED AFR/AP 27 FEB 004/005 PREDICTED AFR/AP 28 FEB-02 MAR 010/012-005/008-005/005
VI. Geomagnetic Activity Probabilities 28 FEB to 02 MAR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 10% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 15% |
| Minor storm | 05% | 05% | 01% |
| Major-severe storm | 01% | 01% | 01% |
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