Viewing archive of Sunday, 27 April 1997
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 1997 Apr 27 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 117 Issued at 2200Z on 27 APR 1997IA. Analysis of Solar Active Regions and Activity from 26-2100Z to 27-2100Z SOLAR ACTIVITY WAS VERY LOW. THE VISIBLE DISK WAS QUIET
AND STABLE. A SPACE-BASED SENSOR REPORTED A MINOR CORONAL MASS
EJECTION (CME) ASSOCIATED WITH REGION 8036 (S19W49) VERY EARLY IN
THE UNIVERSAL DAY. THIS CME WAS NOT CORRELLATED BY ANY OTHER
GROUND-BASED OR SPACE-BASED SENSORS BUT MAY HAVE OCCURRED IN
CONJUNCTION WITH A B6/SF FLARE REPORTED IN THAT REGION AT 26/2356Z.
REGION 8036 IS A STABLE CRO SPOT GROUP AND IS THE ONLY SPOTTED
REGION ON THE VISIBLE DISK AT THIS TIME.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE VERY
LOW FOR THE ENTIRE FORECAST PERIOD.
IIA. Geophysical Activity Summary 26-2100Z to 27-2100Z
THE GEOMAGNETIC FIELD WAS QUIET AT ALL LATITUDES AND AT
GEOSYNCHRONOUS ALTITUDES.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED FOR THE ENTIRE FORECAST PERIOD.
III. Event Probabilities 28 APR to 30 APR
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 27 APR 073 Predicted 28 APR-30 APR 074/074/074 90 Day Mean 27 APR 074
V. Geomagnetic A Indices
OBSERVED AFR/AP 26 APR 005/004 ESTIMATED AFR/AP 27 APR 004/005 PREDICTED AFR/AP 28 APR-30 APR 010/008-010/008-010/008
VI. Geomagnetic Activity Probabilities 28 APR to 30 APR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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