Viewing archive of Wednesday, 18 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 18 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 322 Issued at 2200Z on 18 NOV 1998IA. Analysis of Solar Active Regions and Activity from 17-2100Z to 18-2100Z SOLAR ACTIVITY WAS LOW. TODAY'S ONLY C-CLASS FLARE WAS
AN OPTICALLY UNCORRELATED C1 AT 1055Z. REGION 8384 (S28W36)
CONTINUES TO BE THE LARGEST GROUP ON THE DISK BUT APPEARED TO BE IN
SLOW DECAY. NEW REGION 8391 (S17E61) EMERGED AS A SMALL BUT GROWING
B-TYPE SUNSPOT GROUP.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW.
IIA. Geophysical Activity Summary 17-2100Z to 18-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED DURING THE PAST 24
HOURS. THE GREATER THAN 2 MEV ELECTRON FLUXES EXCEEDED HIGH LEVELS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE UNSETTLED TO ACTIVE FOR THE NEXT 24 HOURS IN RESPONSE
TO A FAVORABLY POSITIONED CORONAL HOLE. PREDOMINANTLY UNSETTLED
LEVELS ARE EXPECTED TO PREVAIL FOR THE 2ND AND 3RD DAYS.
III. Event Probabilities 19 NOV to 21 NOV
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 18 NOV 115 Predicted 19 NOV-21 NOV 115/115/110 90 Day Mean 18 NOV 131
V. Geomagnetic A Indices
OBSERVED AFR/AP 17 NOV 003/004 ESTIMATED AFR/AP 18 NOV 010/012 PREDICTED AFR/AP 19 NOV-21 NOV 020/015-012/015-010/008
VI. Geomagnetic Activity Probabilities 19 NOV to 21 NOV
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 25% | 25% |
| Minor storm | 20% | 10% | 10% |
| Major-severe storm | 10% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 25% | 25% |
| Minor storm | 25% | 15% | 10% |
| Major-severe storm | 15% | 05% | 05% |
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