Viewing archive of Tuesday, 26 January 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 Jan 26 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 026 Issued at 2200Z on 26 JAN 1999IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z SOLAR ACTIVITY RETURNED TO A LOW LEVEL. THE LARGEST
EVENT WAS AN IMPULSIVE C7/1N FROM REGION 8447 (N19W72) AT 26/1844Z
THAT WAS ACCOMPANIED BY MINOR RADIO BURSTS. REGION 8447 IS A SMALL
SPOT GROUP VERY NEAR PREVIOUSLY ACTIVE REGION 8444 (N19W66). REGION
8444 EXHIBITED DECAY DURING THE PERIOD. RECENT MAGNETIC DATA SHOW
SOME MIXED MAGNETIC FIELDS IN THIS SMALL COMPLEX OF REGIONS. A
MODERATE DURATION C5 X-RAY EVENT OCCURRED AT 26/1121Z. AN OBSERVER
REPORTED FAINT CORONAL RAIN BEHIND THE WEST LIMB AT SW25 NEAR THE
END OF THIS X-RAY FLARE. IT IS LIKELY THIS EVENT ORIGINATED FROM
REGION 8439 WHICH IS ONE DAY BEYOND THE WEST LIMB AT THAT LATITUDE.
IB. Solar Activity Forecast
SOLAR ACTIVITY SHOULD REMAIN AT
PREDOMINANTLY LOW LEVELS FOR THE NEXT TWO DAYS WITH REGIONS 8444 AND
8447 PRODUCING OCCASIONAL C-CLASS EVENTS AND POSSIBLY AN ISOLATED
M-CLASS FLARE. VERY LOW LEVELS ARE EXPECTED TO BEGIN ON 29 JAN WHEN
THESE REGIONS ROTATE OFF THE DISK. A FILAMENT LOCATED NEAR N31 AT
THE CENTRAL MERIDIAN COULD ERUPT DURING ITS DISK TRANSIT. A LONG
DURATION C OR M-CLASS EVENT WITH A LARGE CORONAL MASS EJECTION COULD
RESULT SHOULD THE ERUPTION OCCUR.
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
THE GEOMAGNETIC FIELD WAS QUIET. SOLAR WIND VELOCITIES CONTINUED TO
DECREASE. THE GT 10 MEV PROTON ENHANCEMENT CONTINUED TO DECLINE AND
WAS VERY NEAR BACKGROUND LEVEL AT THE END OF THE PERIOD.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO SLIGHTLY UNSETTLED FOR THE NEXT THREE DAYS.
III. Event Probabilities 27 JAN to 29 JAN
| Class M | 20% | 20% | 05% |
| Class X | 10% | 05% | 01% |
| Proton | 10% | 05% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 26 JAN 133 Predicted 27 JAN-29 JAN 123/118/112 90 Day Mean 26 JAN 144
V. Geomagnetic A Indices
OBSERVED AFR/AP 25 JAN 006/009 ESTIMATED AFR/AP 26 JAN 005/010 PREDICTED AFR/AP 27 JAN-29 JAN 010/010-010/008-010/007
VI. Geomagnetic Activity Probabilities 27 JAN to 29 JAN
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| 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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