Viewing archive of Wednesday, 21 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 21 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 141 Issued at 2200Z on 21 MAY 1997IA. Analysis of Solar Active Regions and Activity from 20-2100Z to 21-2100Z SOLAR ACTIVITY BECAME MODERATE. REGION 8040 (N06W12)
PRODUCED AN M1/1N (OPTICAL ESTIMATED) AT 21/2015Z. MODERATE
INTENSITY TYPE II, IV, AND CENTIMETRIC BURSTS ACCOMPANIED THE EVENT.
AN OPTICALLY UNCORRELATED C4 FLARE WAS DETECTED AT 20/2210Z AND
REGION 8040 PRODUCED A C2/SF FLARE AT 21/0625Z. REGION 8040
EXHIBITED GROWTH DURING THE PERIOD AND A WEAK DELTA MAY BE FORMING
IN THE TRAILER. A NEW REGION EMERGED NEAR N02E01 AND WAS NUMBERED AS
REGION 8045.
IB. Solar Activity Forecast
SOLAR ACTIVITY SHOULD BE LOW TO
MODERATE. SHOULD GROWTH CONTINUE IN REGION 8040, C-CLASS AND SMALL
M-CLASS FLARES WILL BECOME MORE FREQUENT.
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
THE GEOMAGNETIC FIELD WAS QUIET. ENERGETIC ELECTRON FLUXES AT
GEOSYNCHRONOUS ORBIT REACHED HIGH LEVELS DURING THE PERIOD.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD SHOULD BE
QUIET TO SLIGHTLY UNSETTLED FOR THE NEXT TWO AND A HALF DAYS.
ACTIVE TO MINOR STORM CONDITIONS ARE FORECAST FOR THE LATTER HALF OF
24 MAY AS A RESULT OF THE EVENT MENTIONED ABOVE. ENERGETIC ELECTRON
FLUXES SHOULD DROP BACK TO BACKGROUND LEVELS WITHIN 48 HOURS.
III. Event Probabilities 22 MAY to 24 MAY
| Class M | 25% | 25% | 25% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 21 MAY 085 Predicted 22 MAY-24 MAY 088/090/091 90 Day Mean 21 MAY 074
V. Geomagnetic A Indices
OBSERVED AFR/AP 20 MAY 006/006 ESTIMATED AFR/AP 21 MAY 003/008 PREDICTED AFR/AP 22 MAY-24 MAY 005/008-005/005-015/015
VI. Geomagnetic Activity Probabilities 22 MAY to 24 MAY
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 05% | 05% | 25% |
| Minor storm | 05% | 05% | 10% |
| Major-severe storm | 01% | 01% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 05% | 10% | 25% |
| Minor storm | 05% | 05% | 10% |
| Major-severe storm | 01% | 01% | 05% |
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