Viewing archive of Wednesday, 16 December 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 Dec 16 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 350 Issued at 2200Z on 16 DEC 1998IA. Analysis of Solar Active Regions and Activity from 15-2100Z to 16-2100Z SOLAR ACTIVITY WAS LOW. ONLY C-CLASS X-RAY EVENTS
OCCURRED DURING THE PERIOD. THE LARGEST WAS A C5/SN EVENT FROM
REGION 8409 (S27W38) AT 16/1909Z. REGION 8408 (S18W53) AND REGION
8409 PRODUCED SEVERAL SUBFLARES. ONE NEW REGION WAS NUMBERED, 8414
(N21E49), AND IS CURRENTLY A BXO BETA SPOT GROUP WITH FOUR SPOTS
VISIBLE.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN
LOW WITH CONTINUED C-CLASS EVENTS. THERE IS A SLIGHT CHANCE OF AN
ISOLATED M-CLASS X-RAY EVENT.
IIA. Geophysical Activity Summary 15-2100Z to 16-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED WITH ONE PERIOD (16/0600
TO 16/0900Z) OF ACTIVE CONDITIONS IN THE HIGH LATITUDES DUE TO THE
AFFECT OF A CORONAL HOLE PASSAGE IN THE NORTHERN HEMISPHERE.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED DURING THE FIRST DAY OF THE PERIOD
DUE TO THE EFFECT OF A CORONAL HOLE IN THE NORTHERN HEMISPHERE. THE
GEOMAGNETIC FIELD IS EXPECTED TO BE QUIET DURING THE LATTER PART OF
THE PERIOD.
III. Event Probabilities 17 DEC to 19 DEC
| Class M | 25% | 25% | 25% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 16 DEC 141 Predicted 17 DEC-19 DEC 140/135/135 90 Day Mean 16 DEC 132
V. Geomagnetic A Indices
OBSERVED AFR/AP 15 DEC 004/005 ESTIMATED AFR/AP 16 DEC 010/012 PREDICTED AFR/AP 17 DEC-19 DEC 010/010-008/008-008/008
VI. Geomagnetic Activity Probabilities 17 DEC to 19 DEC
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 10% | 10% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 15% |
| Minor storm | 05% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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