Viewing archive of Thursday, 17 February 2000
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 2000 Feb 17 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 048 Issued at 2200Z on 17 FEB 2000IA. Analysis of Solar Active Regions and Activity from 16-2100Z to 17-2100Z SOLAR ACTIVITY WAS MODERATE. AN M2/1B ACCOMPANIED BY A
TYPE II RADIO SWEEP OCCURRED AT 17/1852UT FROM REGION 8869 (S22W21).
AN M1 EVENT OCCURRED AT 17/2035UT ACCOMPANIED BY A 200 SFU TENFLARE.
THIS EVENT WAS REPORTED TO OCCUR IN REGION 8872 (S29E02). THE
OPTICAL OBSERVATORY WAS UNABLE OF DETERMINE THE SIZE AND INTENSITY
OF THE FLARE DUE TO POOR SEEING CONDITIONS. BOTH EVENTS PRODUCED
DISAPPEARING SOLAR FILAMENTS AS WELL. THESE EVENTS WERE SOMEWHAT
UNEXPECTED AS THE REGIONS SHOWED VERY LITTLE ACTIVITY PRIOR TO
FLARING. THE REST OF THE DISK AND LIMBS WERE MOSTLY QUIET AND
STABLE.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
WITH AN ISOLATED CHANCE OF M-CLASS EVENTS.
IIA. Geophysical Activity Summary 16-2100Z to 17-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO CONTINUE TO BE QUIET TO UNSETTLED FOR THE FIRST PART OF
THE PERIOD. ACTIVITY COULD INCREASE ON THE THIRD DAY DUE TO THE M2
AND M1 EVENTS THAT OCCURRED DURING THIS PERIOD.
III. Event Probabilities 18 FEB to 20 FEB
| Class M | 30% | 30% | 30% |
| Class X | 10% | 10% | 10% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 17 FEB 168 Predicted 18 FEB-20 FEB 155/150/150 90 Day Mean 17 FEB 167
V. Geomagnetic A Indices
OBSERVED AFR/AP 16 FEB 006/005 ESTIMATED AFR/AP 17 FEB 008/006 PREDICTED AFR/AP 18 FEB-20 FEB 008/008-008/008-042/012
VI. Geomagnetic Activity Probabilities 18 FEB to 20 FEB
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 25% |
| Minor storm | 05% | 05% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 35% |
| Minor storm | 10% | 10% | 15% |
| Major-severe storm | 01% | 01% | 01% |
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