Viewing archive of Monday, 27 July 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 Jul 27 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 208 Issued at 2200Z on 27 JUL 1998IA. Analysis of Solar Active Regions and Activity from 26-2100Z to 27-2100Z SOLAR ACTIVITY REMAINED AT VERY LOW LEVELS. A SINGLE
B-CLASS X-RAY FLARE WAS DETECTED. REGIONS 8280 (S24E02) AND 8282
(N32E04) WERE STABLE. A WEAK DELTA MAGNETIC CONFIGURATION PERSISTED
WITHIN REGION 8282. FOUR NEW REGIONS WERE NUMBERED: 8283 (N27E68),
8284 (N27W24), 8285 (S23E18), AND 8286 (N18E54). ALL OF THE NEW
REGIONS WERE SMALL AND MAGNETICALLY SIMPLE.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE
PREDOMINATELY LOW WITH A FAIR CHANCE FOR AN ISOLATED M-CLASS FLARE
FROM REGION 8282.
IIA. Geophysical Activity Summary 26-2100Z to 27-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED. THE GREATER THAN 2 MEV
ELECTRON FLUX REMAINED AT HIGH LEVELS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED DURING THE FIRST TWO DAYS.
UNSETTLED TO ACTIVE LEVELS ARE EXPECTED ON THE FINAL DAY DUE TO
CORONAL HOLE EFFECTS. THE GREATER THAN 2 MEV ELECTRON FLUX IS
EXPECTED TO DECLINE TO NORMAL TO MODERATE LEVELS BY THE SECOND DAY
OF THE FORECAST PERIOD.
III. Event Probabilities 28 JUL to 30 JUL
| Class M | 30% | 30% | 30% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 27 JUL 120 Predicted 28 JUL-30 JUL 120/120/120 90 Day Mean 27 JUL 109
V. Geomagnetic A Indices
OBSERVED AFR/AP 26 JUL 005/006 ESTIMATED AFR/AP 27 JUL 005/007 PREDICTED AFR/AP 28 JUL-30 JUL 007/010-007/010-015/018
VI. Geomagnetic Activity Probabilities 28 JUL to 30 JUL
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 30% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 20% | 40% |
| Minor storm | 05% | 05% | 10% |
| Major-severe storm | 01% | 01% | 01% |
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