Viewing archive of Saturday, 19 September 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 Sep 19 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 262 Issued at 2200Z on 19 SEP 1998IA. Analysis of Solar Active Regions and Activity from 18-2100Z to 19-2100Z SOLAR ACTIVITY WAS VERY LOW. REGIONS 8336 (S30E11),
8339 (S17E16), AND 8343 (N42E65) ALL PRODUCED SUBFLARES WITH NO
SIGNIFICANT X-RAY ACTIVITY. FREQUENT TYPE III AND V SWEEPS OCCURRED
THROUGHOUT THE PERIOD. REGION 8340 (N19E50) REMAINS THE MOST
IMPRESSIVE REGION, COVERING 470 MILLIONTHS OF WHITE LIGHT AREA, BUT
HAS YET TO PRODUCE ANY SIGNIFICANT ACTIVITY. NEW REGIONS 8341
(N19W58), 8342 (N17E38), AND 8343 WERE ALL NUMBERED TODAY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE VERY
LOW TO LOW. ISOLATED C-CLASS ACTIVITY IS POSSIBLE FROM REGION 8340.
IIA. Geophysical Activity Summary 18-2100Z to 19-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO ACTIVE. OCCASIONAL ACTIVE PERIODS ARE
EXPECTED AS A LARGE EXTENSION OF THE NORTHERN CORONAL HOLE MOVES
INTO A FAVORABLE GEOEFFECTIVE POSITION.
III. Event Probabilities 20 SEP to 22 SEP
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 19 SEP 127 Predicted 20 SEP-22 SEP 130/130/135 90 Day Mean 19 SEP 127
V. Geomagnetic A Indices
OBSERVED AFR/AP 18 SEP 014/020 ESTIMATED AFR/AP 19 SEP 010/015 PREDICTED AFR/AP 20 SEP-22 SEP 015/020-015/025-015/020
VI. Geomagnetic Activity Probabilities 20 SEP to 22 SEP
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 40% | 40% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 40% | 45% | 45% |
| Minor storm | 20% | 25% | 25% |
| Major-severe storm | 05% | 10% | 10% |
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