Viewing archive of Friday, 23 May 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 May 23 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 143 Issued at 2200Z on 23 MAY 1997IA. Analysis of Solar Active Regions and Activity from 22-2100Z to 23-2100Z SOLAR ACTIVITY REMAINED VERY LOW. REGION 8040 (N07W40)
DECAYED AND PRODUCED ONLY MINOR FLUCTUATIONS. A SMALL REGION ROTATED
AROUND THE LIMB AND WAS NUMBERED AS NEW REGION 8046 (S26E68). THE
LARGE PROMINENCES ON THE SOUTHEAST LIMB ON 22 MAY FADED SOMETIME
BEFORE 23/1500Z.
IB. Solar Activity Forecast
SOLAR ACTIVITY SHOULD CONTINUE AT VERY
LOW LEVELS FOR THE NEXT THREE DAYS. THERE IS A SLIGHT POSSIBILITY OF
A C-CLASS FLARE FROM DECAYING REGION 8040.
IIA. Geophysical Activity Summary 22-2100Z to 23-2100Z
THE GEOMAGNETIC FIELD WAS QUIET. THE DISTURBANCE RELATED TO THE CME
ON 21 MAY HAS NOT MATERIALIZED AT THE TIME INITIALLY EXPECTED.
ENERGETIC ELECTRON FLUXES AT GEOSYNCHRONOUS ORBIT WERE BELOW EVENT
THRESHOLD.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
FORECAST TO BE AT ACTIVE TO MINOR STORM LEVELS ON 24 MAY AND EARLY
25 MAY. ISOLATED MAJOR STORMING IS POSSIBLE DURING THIS DISTURBANCE.
THE CONFIDENCE THAT THE CME WILL IMPACT THE EARTH IS HIGH DUE TO THE
NATURE OF SPACE OBSERVATIONS OF THE EVENT. HOWEVER, THE TIMING OF
IMPACT IS DIFFICULT TO PREDICT. QUIET TO UNSETTLED CONDITIONS ARE
EXPECTED ON 26 MAY AFTER THE DISTURBANCE PASSES.
III. Event Probabilities 24 MAY to 26 MAY
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 23 MAY 076 Predicted 24 MAY-26 MAY 076/076/076 90 Day Mean 23 MAY 074
V. Geomagnetic A Indices
OBSERVED AFR/AP 22 MAY 005/004 ESTIMATED AFR/AP 23 MAY 008/010 PREDICTED AFR/AP 24 MAY-26 MAY 025/025-015/010-005/005
VI. Geomagnetic Activity Probabilities 24 MAY to 26 MAY
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 10% |
| Minor storm | 25% | 15% | 05% |
| Major-severe storm | 15% | 10% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 15% | 10% |
| Minor storm | 25% | 20% | 05% |
| Major-severe storm | 20% | 15% | 01% |
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