Viewing archive of Friday, 22 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 22 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 022 Issued at 2200Z on 22 JAN 1999IA. Analysis of Solar Active Regions and Activity from 21-2100Z to 22-2100Z SOLAR ACTIVITY WAS MODERATE. REGION 8440 (N19W50)
PRODUCED AN M1/SF EVENT AT 22/1724Z. REGION 8440 AND REGION 8439
(S23W57) HAVE MAINTAINED BETA-GAMMA MAGNETIC CLASSIFICATIONS WITH
APPROXIMATELY 28 SPOTS IN EACH REGION. REGION 8444 (N19W14) HAS
PRODUCED SEVERAL SUBFLARES DURING THE PERIOD AND HAS SHOWN SLIGHT
GROWTH FROM A CSO-BETA SPOT GROUP WITH 7 SPOTS TO A DSO-BETA GROUP
WITH 10 SPOTS. NEW REGION 8447 (N19W20) IS A CSO-BETA GROUP WITH 6
SPOTS.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. REGIONS 8439 AND 8440 EACH STILL CAPABLE OF PRODUCING
AN ISOLATED M-CLASS EVENT.
IIA. Geophysical Activity Summary 21-2100Z to 22-2100Z
THE GEOMAGNETIC FIELD WAS PREDOMINANTLY QUIET TO UNSETTELD. ACTIVE
CONDITIONS WERE OBSERVED IN THE 22/1500-1800Z PERIOD. THE GREATER
THAN 10 MEV PROTONS STAYED ENHANCED, BUT REMAINED BELOW EVENT
THRESHOLD. A WEAK SHOCK WAS SEEN AT GEOSYNCHRONOUS ORBIT AT
22/2000Z AND IS LIKELY ASSOCIATED WITH THE SOLAR ACTIVITY ON 20
JANUARY.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO ACTIVE DURING THE FIRST PART OF THE PERIOD
WITH ISOLATED PERIODS OF MINOR STORM CONDITIONS POSSIBLE. DURING
THE LATTER PART OF THE PERIOD, THE GEOMAGNETIC FIELD IS EXPECTED TO
BECOME PREDOMINANTLY QUIET TO UNSETTLED. THE GREATER THAN 10 MEV
PROTONS ARE EXPECTED TO REMAIN ENHANCED, OR INCREASE DURING THE
FIRST PART OF THE PERIOD.
III. Event Probabilities 23 JAN to 25 JAN
| Class M | 50% | 50% | 40% |
| Class X | 10% | 10% | 10% |
| Proton | 05% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 22 JAN 178 Predicted 23 JAN-25 JAN 180/178/175 90 Day Mean 22 JAN 142
V. Geomagnetic A Indices
OBSERVED AFR/AP 21 JAN 005/005 ESTIMATED AFR/AP 22 JAN 012/012 PREDICTED AFR/AP 23 JAN-25 JAN 014/012-010/010-008/008
VI. Geomagnetic Activity Probabilities 23 JAN to 25 JAN
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 25% | 15% |
| Minor storm | 20% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 30% | 20% |
| Minor storm | 30% | 15% | 10% |
| Major-severe storm | 05% | 01% | 01% |
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