Viewing archive of Saturday, 31 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 31 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 151 Issued at 2200Z on 31 MAY 1997IA. Analysis of Solar Active Regions and Activity from 30-2100Z to 31-2100Z SOLAR ACTIVITY WAS VERY LOW. A SINGLE B1/SF WITH
ACCOMPANYING 3 DEGREE DSF WAS OBSERVED FROM SPOTLESS REGION 8046
(S26W42) AT 31/1206Z. IN ADDITION, A LARGE 61 DEGREE FILAMENT BEGAN
TO SLOWLY DISSIPATE AT APPROXIMATELY 31/1202Z, AND FINALLY
DISAPPEARING AT APPROXIMATLEY 31/1349Z FROM THE NORTHWEST QUADRANT
(N43, W36 TO W90). OF THE TWO ACTIVE REGIONS CURRENTLY ON THE
VISIBLE DISK, REGION 8047 (N27E19), A 3 SPOT 'CRO' BETA GROUP,
REMAINS STABLE, WHILE 8048 (S29E41), A SIX SPOT 'BXO' BETA, HAS
DISPLAYED GROWTH AND INCREASED ADF AND AFS ACTIVITY SINCE FORMING
YESTERDAY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN
VERY LOW, WITH A COMBINED 40 PERCENT CHANCE FOR A C-CLASS EVENT FROM
REGIONS 8047 AND 8048.
IIA. Geophysical Activity Summary 30-2100Z to 31-2100Z
THE GEOMAGNETIC FIELD HAS BEEN MOSTLY QUIET FOR THE PAST 24 HOURS,
WITH ISOLATED PERIODS OF UNSETTLED CONDITIONS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE MOSTLY QUIET FOR THE NEXT 48 HOURS, WITH CONTINUED
PERIODS OF ISOLATED UNSETTLED CONDITIONS. ACTIVITY ON DAY THREE IS
EXPECTED TO INCREASE TO MOSTLY UNSETTLED WITH THE CHANCE FOR
ISOLATED PERIODS OF ACTIVE CONDITIONS AS AN INITIAL RESPONSE TO
TODAY'S LARGE DSF EVENT. SUSTAINED PERIODS OF ACTIVE CONDITIONS ARE
POSSIBLE ON DAY FOUR.
III. Event Probabilities 01 JUN to 03 JUN
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 31 MAY 073 Predicted 01 JUN-03 JUN 076/076/076 90 Day Mean 31 MAY 074
V. Geomagnetic A Indices
OBSERVED AFR/AP 30 MAY 007/007 ESTIMATED AFR/AP 31 MAY 005/008 PREDICTED AFR/AP 01 JUN-03 JUN 005/005-005/005-010/010
VI. Geomagnetic Activity Probabilities 01 JUN to 03 JUN
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 20% |
| Minor storm | 05% | 05% | 10% |
| Major-severe storm | 01% | 01% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 25% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 01% | 01% | 05% |
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