Viewing archive of Tuesday, 16 February 1999
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 1999 Feb 16 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 047 Issued at 2200Z on 16 FEB 1999IA. Analysis of Solar Active Regions and Activity from 15-2100Z to 16-2100Z SOLAR ACTIVITY WAS MODERATE DUE TO M-CLASS FLARES IN
REGIONS 8462 (N18W20) AND 8458 (S22W23). THE FLARE IN 8458 WAS THE
MOST SIGNIFICANT, BEING A LONG-DURATION M3/SF AT 16/0312UT WHICH WAS
ASSOCIATED WITH TYPE II/IV SWEEPS AND A 560 SFU TENFLARE. THESE TWO
REGIONS ALSO PRODUCED A NUMBER OF C-CLASS SUBFLARES. NEW REGIONS
8466 (S23E59) AND 8467 (N16E65) WERE NUMBERED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. C-CLASS ACTIVITY IS POSSIBLE IN REGIONS 8457, 8458,
8462, AND 8464. REGIONS 8457, 8458, AND 8462 REMAIN THE MOST
PROBABLE AREAS FOR M-CLASS ACTIVITY.
IIA. Geophysical Activity Summary 15-2100Z to 16-2100Z
THE GEOMAGNETIC FIELD WAS QUIET. REAL-TIME SOLAR WIND DATA SUGGESTS
THAT WE ARE NO LONGER UNDER THE INFLUENCE OF THE HIGH-SPEED STREAM
MENTIONED YESTERDAY.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED.
III. Event Probabilities 17 FEB to 19 FEB
| Class M | 50% | 40% | 30% |
| Class X | 05% | 05% | 01% |
| Proton | 05% | 05% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 16 FEB 192 Predicted 17 FEB-19 FEB 190/185/180 90 Day Mean 16 FEB 145
V. Geomagnetic A Indices
OBSERVED AFR/AP 15 FEB 013/013 ESTIMATED AFR/AP 16 FEB 005/006 PREDICTED AFR/AP 17 FEB-19 FEB 005/006-005/008-005/010
VI. Geomagnetic Activity Probabilities 17 FEB to 19 FEB
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
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