Viewing archive of Monday, 9 November 1998
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 1998 Nov 09 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.comJoint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 313 Issued at 2200Z on 09 NOV 1998
IA. Analysis of Solar Active Regions and Activity from 08-2100Z to 09-2100Z
SOLAR ACTIVITY REMAINED MODERATE. REGION 8375 (N21W74)
PRODUCED AN M1/1F AT 08/2256Z. THIS REGION RETAINED ITS MIXED
POLARITIES AND ITS AREAL COVERAGE IN WHITE LIGHT WAS UNCHANGED. NEW
REGION 8384 (S27E78) APPEARED AS A MODERATE SIZE H CLASS SPOT. A
SUSPECTED SPRAY OCCURRED FROM THIS REGION BETWEEN 09/0134-0216Z.
THIS EVENT MAY HAVE BEEN ASSOCIATED WITH A C3 X-RAY ENHANCEMENT AT
09/0153Z. A FILAMENT LOCATED NEAR N24E25 FADED BETWEEN
08/2318-2330Z. SEVERAL CORONAL MASS EJECTIONS WERE OBSERVED IN THE
SOHO CORONAGRAPH DURING THE PERIOD. THE LARGEST WERE FROM MODERATELY
HIGH LATITUDES ON THE SOUTHEAST AND NORTHWEST LIMBS. THE MAUNA LOA
CORONAGRAPH OBSERVED AN ERUPTIVE PROMINENCE AND ASSOCIATED CORONAL
MASS EJECTION FROM NW40-70 BEGINNING AT 09/1915Z.
IB. Solar Activity Forecast
SOLAR ACTIVITY SHOULD BE LOW TO
MODERATE FOR 10-11 NOV. REGION 8375 REMAINS CAPABLE OF PRODUCING
OCCASIONAL M-CLASS EVENTS AND ISOLATED LARGER EVENTS. REGION 8384
COULD PRODUCE AN ISOLATED M-CLASS EVENT.
IIA. Geophysical Activity Summary 08-2100Z to 09-2100Z
THE GEOMAGNETIC FIELD RANGED FROM UNSETTLED TO MAJOR STORM LEVELS.
THE MOST DISTURBED PERIOD WAS FROM 09/0600-1200Z. SOME HIGH LATITUDE
SITES EXPERIENCED SEVERE STORMING DURING THAT TIME. SOLAR WIND DATA
WAS CHARACTERIZED BY A STRONG SOUTHWARD BZ BEGINNING AROUND
09/0330Z, DECREASING VELOCITY, AND DECREASING TOTAL FIELD MAGNITUDE.
A FORBUSH DECREASE OF APPROXIMATELY 6 PERCENT WAS OBSERVED NEAR
09/0100Z.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD SHOULD BE
AT UNSETTLED TO MINOR STORM LEVELS FOR 10 NOV. PERIODS OF MAJOR
STORMING ARE POSSIBLE ON THAT DAY. QUIET TO ACTIVE CONDITIONS ARE
EXPECTED ON 11 NOV AS THE CURRENT DISTURBANCE SUBSIDES. QUIET TO
UNSETTLED CONDITIONS SHOULD OCCUR ON 12 NOV.
III. Event Probabilities 10 NOV to 12 NOV
Class M | 65% | 60% | 15% |
Class X | 30% | 25% | 10% |
Proton | 30% | 25% | 20% |
PCAF | GREEN
|
IV. Penticton 10.7 cm Flux
Observed 09 NOV 162
Predicted 10 NOV-12 NOV 162/156/145
90 Day Mean 09 NOV 133
V. Geomagnetic A Indices
OBSERVED AFR/AP 08 NOV 036/068
ESTIMATED AFR/AP 09 NOV 035/072
PREDICTED AFR/AP 10 NOV-12 NOV 020/025-012/012-010/012
VI. Geomagnetic Activity Probabilities 10 NOV to 12 NOV
A. Middle Latitudes |
Active | 20% | 20% | 20% |
Minor storm | 10% | 10% | 10% |
Major-severe storm | 15% | 10% | 05% |
B. High Latitudes |
Active | 15% | 10% | 10% |
Minor storm | 10% | 05% | 05% |
Major-severe storm | 15% | 05% | 05% |
All times in UTC
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