Viewing archive of Wednesday, 24 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 24 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 328 Issued at 2200Z on 24 NOV 1999IA. Analysis of Solar Active Regions and Activity from 23-2100Z to 24-2100Z SOLAR ACTIVITY WAS LOW. THE LARGEST EVENT OF THE PERIOD
WAS AN OPTICALLY UNCORRELATED C9 X-RAY EVENT AT 24/1222Z. THE LIKELY
SOURCE WAS ACTIVE REGION 8765 (L234) WHICH JUST ROTATED AROUND THE
WEST LIMB. A PROMINENCE ERUPTED OFF THE WEST LIMB NEAR N45,A CORONAL
MASS EJECTION WAS OBSERVED WITH THIS ERUPTION. REGION 8771 (N18W40)
REMAINS THE LARGEST REGION ON THE VISIBLE DISK WITH 750 MILLIONTHS
OF WHITE LIGHT AERIAL COVERAGE. A C6/1N FLARE OCCURRED IN THIS
REGION AT 24/1930Z WITH MINOR DISCRETE RADIO EMISSIONS. NEW REGIONS
8779 (S09W27) AND 8780 (S11E51) WERE NUMBERED TODAY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN
AT LOW TO MODERATE LEVELS. REGION 8771 AND OLD REGION 8765 ARE STILL
CAPABLE OF PRODUCING M-CLASS EVENTS.
IIA. Geophysical Activity Summary 23-2100Z to 24-2100Z
THE GEOMAGNETIC FIELD WAS AT MOSTLY QUIET TO ACTIVE CONDITIONS WITH A
SINGLE PERIOD OF MINOR STORMING AT 24/09-12Z. SUSTAINED NEGATIVE BZ
IS RESPONSIBLE FOR THE MINOR DISTURBANCE.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED WITH ACTIVE CONDITIONS DURING
LOCAL NIGHTTIME HOURS.
III. Event Probabilities 25 NOV to 27 NOV
| Class M | 60% | 60% | 60% |
| Class X | 10% | 10% | 10% |
| Proton | 10% | 10% | 10% |
| PCAF | YELLOW | ||
IV. Penticton 10.7 cm Flux
Observed 24 NOV 187 Predicted 25 NOV-27 NOV 185/180/175 90 Day Mean 24 NOV 166
V. Geomagnetic A Indices
OBSERVED AFR/AP 23 NOV 013/015 ESTIMATED AFR/AP 24 NOV 018/019 PREDICTED AFR/AP 25 NOV-27 NOV 012/010-010/010-007/008
VI. Geomagnetic Activity Probabilities 25 NOV to 27 NOV
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 20% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 25% | 25% |
| Minor storm | 15% | 15% | 15% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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