Viewing archive of Saturday, 20 June 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 Jun 20 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 171 Issued at 2200Z on 20 JUN 1998IA. Analysis of Solar Active Regions and Activity from 19-2100Z to 20-2100Z SOLAR ACTIVITY WAS LOW. REGION 8243 (N18W25) PRODUCED A
C4/1N FLARE AT 20/1430Z. THIS FLARE WAS ASSOCIATED WITH A TYPE II/IV
RADIO SWEEP AND A DECAMETRIC BURST ACROSS THE SPECTRUM (59 SFU AT
2695 MHZ). NEW REGION 8252 (S29W03) WAS NUMBERED. OTHER REGIONS WERE
QUIET.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW.
ANOTHER C-CLASS FLARE IS PROBABLE IN REGION 8243. AN ISOLATED
M-CLASS FLARE IS POSSIBLE.
IIA. Geophysical Activity Summary 19-2100Z to 20-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED.
III. Event Probabilities 21 JUN to 23 JUN
| Class M | 10% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 20 JUN 101 Predicted 21 JUN-23 JUN 102/104/106 90 Day Mean 20 JUN 108
V. Geomagnetic A Indices
OBSERVED AFR/AP 19 JUN 016/014 ESTIMATED AFR/AP 20 JUN 010/010 PREDICTED AFR/AP 21 JUN-23 JUN 010/010-005/008-005/008
VI. Geomagnetic Activity Probabilities 21 JUN to 23 JUN
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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