Viewing archive of Thursday, 14 May 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 May 14 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 134 Issued at 2200Z on 14 MAY 1998IA. Analysis of Solar Active Regions and Activity from 13-2100Z to 14-2100Z SOLAR ACTIVITY WAS LOW. REGION 8220 (S27E34) PRODUCED
THE LARGEST FLARE OF THE PAST DAY, A C2/SF AT 14/1350Z. THIS REGION
HAS DECAYED SOMEWHAT SINCE YESTERDAY. REGION 8218 (S21W31) ALSO
PRODUCED C-CLASS ACTIVITY: A C1/SF AT 13/2225Z AND A C1/SF AT
14/1033Z. THIS REGION HAS ALSO DECAYED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW.
C-CLASS FLARES ARE LIKELY IN REGIONS 8218, 8220, AND 8222.
IIA. Geophysical Activity Summary 13-2100Z to 14-2100Z
THE GEOMAGNETIC FIELD WAS QUIET. THE GREATER THAN 2 MEV ELECTRON FLUX
WAS HIGH.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET.
III. Event Probabilities 15 MAY to 17 MAY
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 14 MAY 117 Predicted 15 MAY-17 MAY 115/115/110 90 Day Mean 14 MAY 109
V. Geomagnetic A Indices
OBSERVED AFR/AP 13 MAY 004/006 ESTIMATED AFR/AP 14 MAY 005/005 PREDICTED AFR/AP 15 MAY-17 MAY 005/005-005/005-005/005
VI. Geomagnetic Activity Probabilities 15 MAY to 17 MAY
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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