Viewing archive of Thursday, 25 March 1999
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 1999 Mar 25 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 084 Issued at 2200Z on 25 MAR 1999IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z SOLAR ACTIVITY WAS VERY LOW. THE FOUR SPOTTED REGIONS
WERE STABLE, AND VERY LITTLE OF SIGNIFICANCE OCCURRED. THERE WAS
SOME MINOR LIMB ACTIVITY NEAR NW05 MIDWAY THROUGH THE PERIOD.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO PERSIST
AT VERY LOW LEVELS.
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
THE GEOMAGNETIC FIELD WAS QUIET UNTIL APPROXIMATELY 1800Z, WHEN
UNSETTLED CONDITIONS OCCURRED. SOLAR WIND DATA SUGGEST THIS MODEST
ACTIVITY MAY BE A GLANCING BLOW FROM A TRANSIENT SEEN ON MARCH 21.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE UNSETTLED THROUGHOUT THE FORECAST PERIOD.
III. Event Probabilities 26 MAR to 28 MAR
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 25 MAR 107 Predicted 26 MAR-28 MAR 105/105/110 90 Day Mean 25 MAR 141
V. Geomagnetic A Indices
OBSERVED AFR/AP 24 MAR 004/004 ESTIMATED AFR/AP 25 MAR 010/010 PREDICTED AFR/AP 26 MAR-28 MAR 015/012-015/012-010/012
VI. Geomagnetic Activity Probabilities 26 MAR to 28 MAR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 20% |
| Minor storm | 15% | 15% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 25% |
| Minor storm | 20% | 20% | 10% |
| Major-severe storm | 05% | 05% | 01% |
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