Viewing archive of Thursday, 4 June 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 Jun 04 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 155 Issued at 2200Z on 04 JUN 1998IA. Analysis of Solar Active Regions and Activity from 03-2100Z to 04-2100Z SOLAR ACTIVITY REMAINED LOW. AN OPTICALLY UNCORRELATED
C1 FLARE OCCURRED AT 03/2308Z AND REGION 8232 (S19E50) PRODUCED A
C1/SF AT 04/2039Z. REGIONS 8232 AND 8233 (N28E49) BOTH PRODUCED
SEVERAL SUBFLARES DURING THE PERIOD. MAGNETICALLY, REGION 8232
SHOWED SEVERAL ISOLATED POLES INDICATING SOME MIXING OF POLARITIES
BUT OVERALL THE REGION WAS STABLE. THE RATE OF EMERGENCE OF REGION
8233 SLOWED. A SMALL NEW REGION EMERGED NEAR N16E66 AND WAS NUMBERED
AS REGION 8234. BETWEEN 03/2130-2257Z, A REPORT WAS RECEIVED OF A
LARGE DISAPPEARING FILAMENT LOCATED NEAR S40E70. NO CME WAS OBSERVED
COINCIDENT WITH THIS EVENT.
IB. Solar Activity Forecast
SOLAR ACTIVITY SHOULD REMAIN GENERALLY
LOW. REGION 8232 SHOULD PRODUCE OCCASIONAL SUBFLARES AND IS CAPABLE
OF GENERATING ISOLATED M-CLASS EVENTS.
IIA. Geophysical Activity Summary 03-2100Z to 04-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED. ISOLATED ACTIVE
CONDITIONS WERE OBSERVED AT A FEW HIGH LATITUDE SITES. ENERGETIC
ELECTRON FLUXES AT GEOSYNCHRONOUS ORBIT WERE APPROACHING HIGH LEVELS
AT THE END OF THE PERIOD.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD SHOULD BE
PREDOMINANTLY QUIET TO UNSETTLED FOR THE NEXT THREE DAYS. ISOLATED
ACTIVE CONDITIONS ARE POSSIBLE ON 05-06 JUN.
III. Event Probabilities 05 JUN to 07 JUN
| Class M | 15% | 15% | 15% |
| Class X | 05% | 05% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 04 JUN 112 Predicted 05 JUN-07 JUN 113/114/112 90 Day Mean 04 JUN 109
V. Geomagnetic A Indices
OBSERVED AFR/AP 03 JUN 012(EST.)/012 ESTIMATED AFR/AP 04 JUN 010/012 PREDICTED AFR/AP 05 JUN-07 JUN 010/014-010/012-007/010
VI. Geomagnetic Activity Probabilities 05 JUN to 07 JUN
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 10% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 05% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 15% |
| Minor storm | 15% | 15% | 05% |
| Major-severe storm | 05% | 05% | 05% |
All times in UTC
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