Viewing archive of Thursday, 28 August 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 Aug 28 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
******************************** CORRECTED COPY ************************************************ SDF Number 240 Issued at 2200Z on 28 AUG 1997IA. Analysis of Solar Active Regions and Activity from 27-2100Z to 28-2100Z SOLAR ACTIVITY WAS VERY LOW. A SERIES OF B-CLASS
EVENTS, THE LARGEST OF WHICH WAS A B9.3, WERE REPORTED. NONE WERE
CORRELATED WITH OPTICAL FLARES. REGION 8076 (N29E24) CONTINUED ITS
GROWTH AND IS NOW A DSI SPOT GROUP IN A BETA-GAMMA CONFIGURATION.
NEW REGION 8079 (N15E10) WAS NUMBERED TODAY. THIS REGION IS
APPROXIMATELY 9 DEGREES SOUTHWEST OF REGION 8078 (N16E12) AND
APPEARS TO BE CONNECTED. HOWEVER, SPACE-BASED X-RAY IMAGES AND
MAGNETIC ANALYSIS INDICATE A TRAILER POLARITY AREA WITHOUT SPOTS
INTERCEDES BETWEEN THE TWO REGIONS, THUS LENDING CREDENCE TO THEIR
SEPARATION.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE VERY
LOW TO LOW. REGION 8076 HAS A GOOD CHANCE OF PRODUCING ADDITIONAL
C-CLASS EVENTS AND AN OUTSIDE CHANCE OF PRODUCING AN ISOLATED
M-CLASS EVENT.
IIA. Geophysical Activity Summary 27-2100Z to 28-2100Z
THE GOEMAGNETIC FIELD RANGED FROM QUIET TO MINOR STORMING AT ALL
LATITUDES. ACTIVE TO MINOR STORM LEVELS WERE OBSERVED BETWEEN
28/0300 AND 28/0900Z. THIS DISTURBANCE MAY HAVE BEEN THE RESULT OF A
MODERATELY WELL-PLACE NORTHERN CORONAL HOLE EXTENSION. SPACE-BASED
INSTRUMENTS INDICATE EARTH WAS IN A HIGH SPEED, LOW DENSITY CORONAL
HOLE STREAM AT THE TIME OF THE DISTURBANCE.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED FOR THE ENTIRE FORECAST PERIOD.
III. Event Probabilities 29 AUG to 31 AUG
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 28 AUG 091 Predicted 29 AUG-31 AUG 092/092/092 90 Day Mean 28 AUG 073
V. Geomagnetic A Indices
OBSERVED AFR/AP 27 AUG 004/005 ESTIMATED AFR/AP 28 AUG 014/014 PREDICTED AFR/AP 29 AUG-31 AUG 010/005-010/008-005/008
VI. Geomagnetic Activity Probabilities 29 AUG to 31 AUG
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 10% |
| Minor storm | 01% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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