Viewing archive of Tuesday, 1 September 1998
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 1998 Sep 01 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 244 Issued at 2200Z on 01 SEP 1998IA. Analysis of Solar Active Regions and Activity from 31-2100Z to 01-2100Z SOLAR ACTIVITY WAS MODERATE. REGION 8307 (N32W90)
PRODUCED AN M1/1F FLARE AT 0459Z. REGION 8323 (S23E30) CONTINUED TO
GROW AND IS NOW A LARGE (1230 MILLIONTHS) COMPACT SUNSPOT GROUP WITH
A MAGNETIC DELTA CONFIGURATION. THE REGION PRODUCED SEVERAL C-CLASS
SUBFLARES DURING THE PERIOD. REGION 8319 (N19W68) ALSO PRODUCED
SEVERAL C-CLASS SUBFLARES, BUT DID NOT SHOW ANY GROWTH TREND AND HAS
A SIMPLE, BETA MAGNETIC CLASSIFICATION.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE
PREDOMINANTLY MODERATE. THE CONTINUED GROWTH, COMPLEXITY, AND
MAGNETIC FIELD STRENGTHS IN REGION 8323, HOWEVER, IMPLY THAT THERE
IS A FAIR CHANCE FOR A MAJOR FLARE EVENT OVER THE NEXT FEW DAYS.
IIA. Geophysical Activity Summary 31-2100Z to 01-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO ACTIVE. SOLAR WIND CONDITIONS
APPEARED TO BE TRANSITIONING FROM THE HIGH SPEED, LOW DENSITY FLOW
OF THE LAST FEW DAYS, TO A SLOWER, SOMEWHAT HIGHER DENSITY THAT IS
CHARACTERISTIC OF NORMAL QUIESCENT SOLAR WIND. THE GREATER THAN 2
MEV ELECTRON FLUXES ATTAINED HIGH LEVELS DURING THE PAST 24 HOURS.
IIB. Geophysical Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO
BE MOSTLY UNSETTLED, WITH A FEW ISOLATED ACTIVE PERIODS OVER THE
NEXT TWO DAYS. CONDITIONS ARE EXPECTED TO BE QUIET TO UNSETTLED BY
DAY THREE.
III. Event Probabilities 02 SEP to 04 SEP
| Class M | 70% | 65% | 65% |
| Class X | 20% | 20% | 20% |
| Proton | 20% | 20% | 20% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 01 SEP 177 Predicted 02 SEP-04 SEP 170/165/150 90 Day Mean 01 SEP 121
V. Geomagnetic A Indices
OBSERVED AFR/AP 31 AUG 012/022 ESTIMATED AFR/AP 01 SEP 010/022 PREDICTED AFR/AP 02 SEP-04 SEP 015/015-015/012-005/012
VI. Geomagnetic Activity Probabilities 02 SEP to 04 SEP
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 35% | 15% |
| Minor storm | 15% | 15% | 10% |
| Major-severe storm | 05% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 35% | 15% |
| Minor storm | 20% | 20% | 10% |
| Major-severe storm | 10% | 10% | 05% |
All times in UTC
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