Viewing archive of Friday, 18 April 1997
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 1997 Apr 18 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 108 Issued at 2200Z on 18 APR 1997IA. Analysis of Solar Active Regions and Activity from 17-2100Z to 18-2100Z SOLAR ACTIVITY WAS VERY LOW. REGION 8032 (S23W34) IS
THE ONLY SPOTTED REGION ON THE DISK AND CONTINUES TO DECAY.
IB. Solar Activity Forecast
SOLAR ACTIVITY WILL BE VERY LOW.
IIA. Geophysical Activity Summary 17-2100Z to 18-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO ACTIVE. REAL-TIME DATA SHOW
SLIGHTLY ELEVATED SOLAR WIND SPEEDS. THE GREATER THAN 2 MEV ELECTRON
FLUX WAS MODERATE TO HIGH.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE UNSETTLED THROUGHOUT THE PERIOD.
III. Event Probabilities 19 APR to 21 APR
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 18 APR 070 Predicted 19 APR-21 APR 072/072/072 90 Day Mean 18 APR 074
V. Geomagnetic A Indices
OBSERVED AFR/AP 17 APR 023/026 ESTIMATED AFR/AP 18 APR 020/015 PREDICTED AFR/AP 19 APR-21 APR 015/010-012/008-012/010
VI. Geomagnetic Activity Probabilities 19 APR to 21 APR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 20% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 25% | 25% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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