Viewing archive of Monday, 24 August 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 Aug 24 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 236 Issued at 2200Z on 24 AUG 1998IA. Analysis of Solar Active Regions and Activity from 23-2100Z to 24-2100Z SOLAR ACTIVITY BECAME LOW. REGION 8307 (N31E10)
PRODUCED A C1/SF AT 24/1525Z. REGION 8307 CONTINUED ITS DECLINE IN
WHITE LIGHT AREA AND BECAME MORE BIPOLAR MAGNETICALLY. PENUMBRAL
DECAY IN THE NORTHERN PORTION OF THE REGION CAUSED THE DELTA
CONFIGURATION TO FADE. REGION 8309 (N16W38) GREW SLIGHTLY AND
EXHIBITED MINOR MIXING OF POLARITIES.
IB. Solar Activity Forecast
SOLAR ACTIVITY SHOULD REMAIN
PREDOMINANTLY LOW FOR THE NEXT THREE DAYS. REGION 8307 RETAINS THE
CAPABILITY OF PRODUCING AN ISOLATED M-CLASS EVENT BUT THAT
POSSIBILITY IS DECREASING AS THE REGION DECAYS.
IIA. Geophysical Activity Summary 23-2100Z to 24-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED. SOME HIGH LATITUDE
SITES EXPERIENCED BRIEF ACTIVE PERIODS. SOLAR WIND VELOCITY
DECREASED TO APPROXIMATELY 430 KM/S FROM A HIGH OF NEAR 600 KM/S ON
23 AUG. THE GREATER THAN 10 MEV PROTON ENHANCEMENT CONTINUED TO
DECAY SLOWLY. FLUXES WERE NEAR 1 PFU.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE GENERALLY UNSETTLED TO ACTIVE FOR 25-26 AUG IN
RESPONSE TO AN M9 FLARE AND SUSPECTED CME EARLY ON 22 AUG. DURING
THE DISTURBANCE, MINOR STORM PERIODS ARE POSSIBLE AT MIDDLE
LATITUDES AND ISOLATED MAJOR STORMING IS POSSIBLE AT HIGH LATITUDES.
THE FIELD SHOULD BECOME PREDOMINANTLY UNSETTLED ON 27 AUG AS THE
DISTURBANCE SUBSIDES. THE PROTON ENHANCEMENT SHOULD CONTINUE TO
SLOWLY DECLINE.
III. Event Probabilities 25 AUG to 27 AUG
| Class M | 35% | 30% | 25% |
| Class X | 10% | 10% | 10% |
| Proton | 10% | 10% | 10% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 24 AUG 121 Predicted 25 AUG-27 AUG 120/120/120 90 Day Mean 24 AUG 116
V. Geomagnetic A Indices
OBSERVED AFR/AP 23 AUG 014/023 ESTIMATED AFR/AP 24 AUG 010/014 PREDICTED AFR/AP 25 AUG-27 AUG 025/027-025/025-018/020
VI. Geomagnetic Activity Probabilities 25 AUG to 27 AUG
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 30% |
| Minor storm | 30% | 30% | 15% |
| Major-severe storm | 15% | 15% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 30% |
| Minor storm | 30% | 30% | 15% |
| Major-severe storm | 20% | 20% | 05% |
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