Viewing archive of Tuesday, 26 May 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 May 26 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 146 Issued at 2200Z on 26 MAY 1998IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z SOLAR ACTIVITY BECAME LOW. REGION 8226 (N18W52), THE
LARGEST VISIBLE REGION ON THE SUN, PRODUCED A C1/1F FLARE AT
26/2035Z. THIS REGION UNDERWENT VERY LITTLE CHANGE SINCE STABILIZING
YESTERDAY AS A 14 SPOT 'DKO' GROUP. REGION 8224 (S31W88) HEATED UP
LATE IN THE PERIOD AS IT NEARED THE WEST LIMB. PLAGE AREA HAS
EXPANDED WITH FREQUENT FLUCTUATIONS OBSERVED. REGION 8227 (N24E61)
REMAINS UNEVENTFUL.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE VERY
LOW TO LOW. BOTH REGIONS 8226 AND 8227 ARE CAPABLE OF PRODUCING
ISOLATED C-CLASS ACTIVITY.
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO REMAIN MOSTLY QUIET TO UNSETTLED. ISOLATED ACTIVE
PERIODS ARE LIKELY AT HIGH LATITUDES.
III. Event Probabilities 27 MAY to 29 MAY
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 26 MAY 093 Predicted 27 MAY-29 MAY 094/096/096 90 Day Mean 26 MAY 108
V. Geomagnetic A Indices
OBSERVED AFR/AP 25 MAY 010/015 ESTIMATED AFR/AP 26 MAY 007/008 PREDICTED AFR/AP 27 MAY-29 MAY 007/012-007/010-007/008
VI. Geomagnetic Activity Probabilities 27 MAY to 29 MAY
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| 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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