Viewing archive of Sunday, 17 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 17 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 017 Issued at 2200Z on 17 JAN 1999IA. Analysis of Solar Active Regions and Activity from 16-2100Z to 17-2100Z SOLAR ACTIVITY WAS LOW. THE TWO MOST ACTIVE REGIONS
WERE 8439 (S24E24) AND 8440 (N19E16). REGION 8439 HAS SHOWN AN
INCREASE IN ACTIVITY, PRODUCING 3 C-CLASS EVENTS. THE LARGEST BEING
A C5/SF AT 17/1955UT. THIS EVENT ALSO PRODUCED A TYPE II SWEEP. THE
REGIONS SPOT COUNT HAS INCREASED FROM 31 TO 40, WITH A SLIGHT
REDUCTION IN AREA. CURRENTLY AN FAO SPOT GROUP WITH A BETA MAGNETIC
CLASSIFICATION. REGION 8440 HAS SHOWN A REDUCTION IN ACTIVITY
PRODUCING ONLY 5 C-CLASS FLARES, THE LARGEST A C4/SF AT 17/1156UT.
THE REGIONS SPOT COUNT HAS INCREASED FROM 31 TO 42, WITH A SLIGHT
REDUCTION IN AREA. CURRENTLY AN EAI SPOT GROUP WITH A BETA-GAMMA
MAGNETIC CLASSIFICATION. ONE NEW REGION WAS NUMBERED TODAY; 8442
(N24W16). CURRENTLY AN 8 SPOT DSO BETA SPOT GROUP.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. REGIONS 8439 AND 8440 ARE STILL CAPABLE OF PRODUCING
ISOLATED M-CLASS EVENTS.
IIA. Geophysical Activity Summary 16-2100Z to 17-2100Z
THE GEOMAGNETIC FIELD WAS QUIET. THE GREATER THAN 2 MEV ELECTRON FLUX
AT GEOSYNCHRONOUS ORBIT WAS AT HIGH LEVELS FOR MOST OF THE DAY WITH
THE EXCEPTION OF THE PERIOD BETWEEN 17/0000-0130UT. THE FLUX FELL
BELOW THRESHOLD LEVELS DURING THAT PERIOD.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED.
III. Event Probabilities 18 JAN to 20 JAN
| Class M | 70% | 70% | 70% |
| Class X | 10% | 10% | 10% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 17 JAN 161 Predicted 18 JAN-20 JAN 165/170/175 90 Day Mean 17 JAN 138
V. Geomagnetic A Indices
OBSERVED AFR/AP 16 JAN 007/007 ESTIMATED AFR/AP 17 JAN 005/010 PREDICTED AFR/AP 18 JAN-20 JAN 005/008-005/008-005/008
VI. Geomagnetic Activity Probabilities 18 JAN to 20 JAN
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 20% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
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