Viewing archive of Sunday, 5 April 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 Apr 05 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 095 Issued at 2200Z on 05 APR 1998IA. Analysis of Solar Active Regions and Activity from 04-2100Z to 05-2100Z SOLAR ACTIVITY INCREASED TO MODERATE LEVELS. NEWLY
NUMBERED REGION 8194 (S18E71) PRODUCED AN M1/SF FLARE AT 05/1639UT
AS IT CONTINUED TO ROTATE INTO VIEW. MINOR CENTIMETRIC RADIO BURSTS
WERE DETECTED DURING THE FLARE. NEW REGION 8195 (S26E75) ALSO
ROTATED INTO VIEW, TO THE SOUTHEAST OF REGION 8194. LIMB PROXIMITY
PREVENTED A DETAILED ANALYSIS OF THESE REGIONS, WHICH ARE SITUATED
WITHIN A BAND OF HISTORICALLY ACTIVE LONGITUDES. BOTH REGIONS ARE
LIKELY PART OF AN EMERGING REGION COMPLEX. REGION 8193 (S22E28)
DISPLAYED MODERATE GROWTH AND PRODUCED A SINGLE C-CLASS SUBFLARE.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE
MODERATE. M-CLASS FLARES ARE EXPECTED FROM REGION 8194. THERE IS
ALSO A SLIGHT CHANCE FOR A MAJOR FLARE FROM THIS REGION.
IIA. Geophysical Activity Summary 04-2100Z to 05-2100Z
THE GEOMAGNETIC FIELD WAS QUIET AT ALL LATITUDES DURING MOST OF THE
PERIOD.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE AT QUIET TO UNSETTLED LEVELS.
III. Event Probabilities 06 APR to 08 APR
| Class M | 60% | 60% | 60% |
| Class X | 05% | 05% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 05 APR 126 Predicted 06 APR-08 APR 130/134/136 90 Day Mean 05 APR 100
V. Geomagnetic A Indices
OBSERVED AFR/AP 04 APR 008/010 ESTIMATED AFR/AP 05 APR 005/005 PREDICTED AFR/AP 06 APR-08 APR 007/010-008/010-008/010
VI. Geomagnetic Activity Probabilities 06 APR to 08 APR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 15% | 15% |
| Minor storm | 05% | 10% | 10% |
| Major-severe storm | 02% | 02% | 02% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 20% | 20% |
| Minor storm | 10% | 15% | 15% |
| Major-severe storm | 01% | 01% | 01% |
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