Viewing archive of Tuesday, 9 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 09 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 313 Issued at 2200Z on 09 NOV 1999IA. Analysis of Solar Active Regions and Activity from 08-2100Z to 09-2100Z SOLAR ACTIVITY BECAME MODERATE. REGION 8759 (N10E46)
PRODUCED A MODERATE DURATION M1/1F AT 09/2009Z. THIS REGION IS LARGE
AND WAS GENERALLY STABLE BUT EXHIBITED SOME MIXED POLARITIES
INCLUDING A WEAK DELTA CONFIGURATION IN THE TRAILER WHERE THE M1
FLARE WAS LOCATED. REGION 8760 (N14E10) CONTINUED TO EMERGE AT A
MODERATELY FAST PACE AND PRODUCED A C8/2B AT 09/0607Z WITH MINOR
RADIO BURSTS. IN ADDITION TO FREQUENT SUBFLARES, THIS REGION
EXHIBITED BRIGHT PLAGE FOR ALMOST ALL OF THE PERIOD. THERE WERE
INDICATIONS THAT A MODERATE SIZE REGION IS RETURNING TO THE
SOUTHEAST LIMB.
IB. Solar Activity Forecast
SOLAR ACTIVITY SHOULD BE GENERALLY
MODERATE FOR THE NEXT THREE DAYS. BOTH REGIONS 8759 AND 8760 ARE
CAPABLE OF GENERATING M-CLASS FLARES. REGION 8759 COULD PRODUCE AN
ISOLATED X-CLASS EVENT.
IIA. Geophysical Activity Summary 08-2100Z to 09-2100Z
THE GEOMAGNETIC FIELD RANGED FROM UNSETTLED TO MINOR STORM LEVELS.
THE MOST DISTURBED PERIOD WAS FROM 09/0900-1200Z. SOME HIGH LATITUDE
SITES EXPERIENCED BRIEF PERIODS OF MAJOR STORMING. THIS DISTURBANCE
IS CORONAL HOLE RELATED. ENERGETIC ELECTRON FLUXES AT GEOSYNCHRONOUS
ORBIT BECAME HIGH NEAR 09/1035Z.
IIB. Geophysical Activity Forecast
THE CURRENT GEOMAGNETIC FIELD
DISTURBANCE IS EXPECTED TO CONTINUE FOR THE NEXT THREE DAYS.
PERIODS OF MINOR STORMING AT MID LATITUDES, AND MAJOR STORMING AT
HIGH LATITUDES, ARE POSSIBLE DURING THE PERIOD. ENERGETIC ELECTRON
FLUXES SHOULD REMAIN HIGH FOR APPROXIMATELY ONE WEEK. THERE IS A
SLIGHT POSSIBILITY OF A SOLAR PROTON EVENT DURING THE PERIOD.
III. Event Probabilities 10 NOV to 12 NOV
| Class M | 75% | 75% | 75% |
| Class X | 15% | 15% | 15% |
| Proton | 10% | 10% | 10% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 09 NOV 230 Predicted 10 NOV-12 NOV 215/220/225 90 Day Mean 09 NOV 157
V. Geomagnetic A Indices
OBSERVED AFR/AP 08 NOV 019/033 ESTIMATED AFR/AP 09 NOV 025/029 PREDICTED AFR/AP 10 NOV-12 NOV 020/027-018/025-018/020
VI. Geomagnetic Activity Probabilities 10 NOV to 12 NOV
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 40% | 40% | 40% |
| Minor storm | 30% | 25% | 25% |
| Major-severe storm | 15% | 15% | 15% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 40% | 40% | 40% |
| Minor storm | 35% | 35% | 30% |
| Major-severe storm | 20% | 20% | 15% |
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