Viewing archive of Friday, 27 March 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 Mar 27 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 086 Issued at 2200Z on 27 MAR 1998IA. Analysis of Solar Active Regions and Activity from 26-2100Z to 27-2100Z SOLAR ACTIVITY WAS LOW. A C1 LONG DURATION EVENT WITH A
TYPE II RADIO SWEEP OCCURRED AT 27/0046Z. GROUND AND SPACE BASED
OBSERVATIONS INDICATE REGION 8188 (N30E30) AS THE SOURCE REGION. A
CME IN THE NE QUADRANT OF THE DISK WAS LIKELY ASSOCIATED WITH THIS
FLARE. REGION 8185 (S25W03) ALSO PRODUCED A C1/SF AT 27/1603Z.
SEVERAL OPTICALLY UNCORRELATED RADIO BURSTS AND SWEEPS ALSO OCCURRED
INCLUDING A 610MHZ, 2700SFU BURST AT 27/1454Z. NEW REGION 8189
(S27W17) WAS NUMBERED TODAY AND PRODUCED A C1/SF AT 27/1323Z.
IB. Solar Activity Forecast
SOLAR ACTIVITY SHOULD BE LOW TO
MODERATE THROUGH THE PERIOD. REGION 8185 REMAINS CAPABLE OF
PRODUCING ISOLATED M-CLASS EVENTS.
IIA. Geophysical Activity Summary 26-2100Z to 27-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED THROUGH THE PERIOD.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD SHOULD BE
QUIET TO UNSETTLED THROUGHOUT THE FORECAST PERIOD.
III. Event Probabilities 28 MAR to 30 MAR
| Class M | 25% | 25% | 25% |
| Class X | 05% | 05% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 27 MAR 108 Predicted 28 MAR-30 MAR 108/105/105 90 Day Mean 27 MAR 099
V. Geomagnetic A Indices
OBSERVED AFR/AP 26 MAR 009/010 ESTIMATED AFR/AP 27 MAR 014/012 PREDICTED AFR/AP 28 MAR-30 MAR 010/010-010/010-010/008
VI. Geomagnetic Activity Probabilities 28 MAR to 30 MAR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 20% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 05% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 25% |
| Minor storm | 15% | 15% | 15% |
| Major-severe storm | 05% | 05% | 05% |
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