Viewing archive of Monday, 6 December 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 Dec 06 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 340 Issued at 2200Z on 06 DEC 1999IA. Analysis of Solar Active Regions and Activity from 05-2100Z to 06-2100Z SOLAR ACTIVITY REMAINED LOW. THE LARGEST ACTIVITY WAS A
C8/2N TENFLARE EVENT FROM REGION 8788 (N09E29) AT 06/0718UT. THIS
EVENT ALSO INCLUDED A TYPE II SWEEP WITH A SPEED OF 500 KM/S AND A
FULL-HALO CME AS DETECTED BY THE LASCO SPACECRAFT. NEW REGION 8790
(N09E47) WAS NUMBERED TODAY. ALTHOUGH THIS REGION IS A SMALL 4 SPOT
BXO BETA GROUP IT IS SHOWING INCREASING ACTIVITY AND HAS PRODUCED
SEVERAL OPTICAL SUBFLARES. THE REST OF THE DISK AND LIMB WERE MOSTLY
STABLE WITH LITTLE ACTIVITY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW.
IIA. Geophysical Activity Summary 05-2100Z to 06-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO ACTIVE. THE DISTURBANCE IN THE
GEOMAGNETIC FIELD FOR THE LAST TWO DAYS IS A CONSEQUENCE OF HIGH
SPEED SOLAR WIND FROM A WELL POSITIONED CORONAL HOLE.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE MOSTLY UNSETTLED TO ACTIVE. EPISODIC MINOR STORM
CONDITIONS MAY OCCUR DURING LOCAL NIGHTTIME'S. THIS STREAM SHOULD
CONTINUE TO AFFECT THE FIELD FOR THE NEXT TWO DAYS. THE FULL-HALO
CME DESCRIBED ABOVE COULD HAVE POTENTIAL GEOMAGNETIC AFFECTS ON
DECEMBER 9-10.
III. Event Probabilities 07 DEC to 09 DEC
| Class M | 20% | 20% | 20% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 06 DEC 143 Predicted 07 DEC-09 DEC 150/150/155 90 Day Mean 06 DEC 165
V. Geomagnetic A Indices
OBSERVED AFR/AP 05 DEC 019/018 ESTIMATED AFR/AP 06 DEC 020/020 PREDICTED AFR/AP 07 DEC-09 DEC 015/018-015/015-015/015
VI. Geomagnetic Activity Probabilities 07 DEC to 09 DEC
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 01% | 01% | 01% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 01% | 01% | 01% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
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