Viewing archive of Tuesday, 23 November 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 Nov 23 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 327 Issued at 2200Z on 23 NOV 1999IA. Analysis of Solar Active Regions and Activity from 22-2100Z to 23-2100Z SOLAR ACTIVITY REMAINED AT LOW LEVELS. REGION 8771
(S14W26) PRODUCED NUMEROUS SUBFLARES DURING THE PERIOD INCLUDING A
FEW THAT REACHED C-CLASS. THIS REGION APPEARED TO STABILIZE AS A
LARGE E-TYPE SPOT GROUP WITH COMPACT SUNSPOT DISTRIBUTION AND A
MIXED-POLARITY MAGNETIC STRUCTURE. REGION 8765 (S12W85) REMAINED A
LARGE, MAGNETICALLY COMPLEX GROUP, BUT WAS STABLE AS IT BEGAN TO
CROSS THE WEST LIMB. THE REMAINING REGIONS WERE STABLE. NO NEW
REGIONS WERE ASSIGNED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. ISOLATED M-CLASS FLARES ARE POSSIBLE FROM REGION 8771
AND REGION 8765 (AS IT ROTATES OUT OF VIEW). THERE IS ALSO A SLIGHT
CHANCE FOR A MAJOR FLARE FROM EITHER OF THESE REGIONS.
IIA. Geophysical Activity Summary 22-2100Z to 23-2100Z
GEOMAGNETIC FIELD ACTIVITY RANGED FROM QUIET TO ACTIVE LEVELS. ACTIVE
LEVELS OCCURRED DURING 23/0500 - 0900Z FOLLOWING A PERIOD OF
PERSISTENT SOUTHWARD IMF BZ. ACTIVITY DECLINED TO UNSETTLED LEVELS
AFTER 23/0900Z.
IIB. Geophysical Activity Forecast
GEOMAGNETIC FIELD ACTIVITY IS
EXPECTED TO BE AT MOSTLY QUIET TO UNSETTLED LEVELS THROUGH THE
PERIOD. THERE IS A SLIGHT CHANCE FOR A PROTON EVENT AT
GEOSYNCHRONOUS ORBIT, SHOULD A MAJOR FLARE OCCUR FROM REGIONS 8765
OR 8771.
III. Event Probabilities 24 NOV to 26 NOV
| Class M | 70% | 60% | 60% |
| Class X | 10% | 10% | 10% |
| Proton | 10% | 10% | 10% |
| PCAF | YELLOW | ||
IV. Penticton 10.7 cm Flux
Observed 23 NOV 186 Predicted 24 NOV-26 NOV 175/170/155 90 Day Mean 23 NOV 167
V. Geomagnetic A Indices
OBSERVED AFR/AP 22 NOV 008/010 ESTIMATED AFR/AP 23 NOV 014/014 PREDICTED AFR/AP 24 NOV-26 NOV 012/015-010/010-007/010
VI. Geomagnetic Activity Probabilities 24 NOV to 26 NOV
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 15% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 25% | 20% |
| Minor storm | 15% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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