Viewing archive of Friday, 16 October 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 Oct 16 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 289 Issued at 2200Z on 16 OCT 1998IA. Analysis of Solar Active Regions and Activity from 15-2100Z to 16-2100Z
SOLAR ACTIVITY WAS LOW. REGIONS 8358 (N15W41) AND 8360
(S18W39) PRODUCED SEVERAL B AND C-CLASS SUBFLARES. REGION 8360 IS
STILL UNDERGOING MINOR GROWTH AND NOW COVERS 340 MILLIONTHS OF WHITE
LIGHT AREA. A LARGE 27 DEGREE FILAMENT NEAR N19E10 ERUPTED YESTERDAY
MORNING AT APPROXIMATELY 15/1000Z. EIT IMAGERY DETECTED THIS ACTIVE
FILAMENT AS IT ERUPTED AND LASCO REPORTED A FULL HALO CME. ALL OTHER
REGIONS WERE QUIET.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN
LOW. REGIONS 8360 AND 8358 SHOULD CONTINUE TO PRODUCE ISOLATED
C-CLASS ACTIVITY WITH A SMALL CHANCE OF A M-CLASS FLARE.
IIA. Geophysical Activity Summary 15-2100Z to 16-2100Z
THE GEOMAGNETIC FIELD WAS QUIET.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET THROUGH TOMORROW. IMPACT FROM THE 15 OCT CME IS
EXPECTED ON DAY 2 THROUGH DAY 3. EXPECT ACTIVE CONDITIONS WITH
ISOLATED MINOR STORMING PERIODS ON BOTH DAYS.
III. Event Probabilities 17 OCT to 19 OCT
| Class M | 15% | 15% | 15% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 16 OCT 131 Predicted 17 OCT-19 OCT 135/140/140 90 Day Mean 16 OCT 131
V. Geomagnetic A Indices
OBSERVED AFR/AP 15 OCT 002/006 ESTIMATED AFR/AP 16 OCT 003/004 PREDICTED AFR/AP 17 OCT-19 OCT 005/008-016/025-020/020
VI. Geomagnetic Activity Probabilities 17 OCT to 19 OCT
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 50% | 50% |
| Minor storm | 01% | 35% | 35% |
| Major-severe storm | 01% | 10% | 10% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 50% | 50% |
| Minor storm | 05% | 40% | 40% |
| Major-severe storm | 01% | 10% | 10% |
All times in UTC
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