Viewing archive of Saturday, 11 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 11 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 101 Issued at 2200Z on 11 APR 1998IA. Analysis of Solar Active Regions and Activity from 10-2100Z to 11-2100Z SOLAR ACTIVITY WAS LOW. THREE SMALL C-CLASS EVENTS
OCCURRED DURING THE PAST 24 HOURS, THE LARGEST AN UNCORRELATED C3
FLARE AT 11/0912. REGION 8194 (S19W03) GENERATED THE ONLY CORRELATED
EVENT, A C1/SF FLARE AT 11/1513Z. ALL OF THE 7 ACTIVE REGIONS
CURRENTLY ON THE VISIBLE DISK HAVE BEEN RELATIVELY STABLE SINCE
YESTERDAY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE
MOSTLY LOW, WITH THE CHANCE FOR AN ISOLATED M-CLASS EVENT.
IIA. Geophysical Activity Summary 10-2100Z to 11-2100Z
THE GEOMAGNETIC FIELD HAS BEEN MOSTLY UNSETTLED FOR THE PAST 24
HOURS, WITH A SINGLE PERIOD OF ACTIVE CONDITIONS RECORDED AT HIGH
LATITUDES DURING THE INTERVAL 11/0900-1200Z.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETLED FOR THE NEXT THREE DAYS.
III. Event Probabilities 12 APR to 14 APR
| Class M | 20% | 20% | 20% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 11 APR 128 Predicted 12 APR-14 APR 128/126/126 90 Day Mean 11 APR ???
V. Geomagnetic A Indices
OBSERVED AFR/AP 10 APR 008/011 ESTIMATED AFR/AP 11 APR 010/010 PREDICTED AFR/AP 12 APR-14 APR 010/013-010/010-010/008
VI. Geomagnetic Activity Probabilities 12 APR to 14 APR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
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