Viewing archive of Tuesday, 13 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 13 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 286 Issued at 2200Z on 13 OCT 1998IA. Analysis of Solar Active Regions and Activity from 12-2100Z to 13-2100Z SOLAR ACTIVITY REMAINED AT LOW LEVELS. ISOLATED B- AND
C-CLASS SUBFLARES OCCURRED. THERE WAS NO REMARKABLE GROWTH OR DECAY
OBSERVED IN ANY OF THE PRESENT REGIONS. NEW REGIONS 8358 (N15E02)
AND 8359 (N23W47) WERE NUMBERED. BOTH WERE SMALL, SIMPLE BIPOLES.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
WITH A GRADUALLY INCREASING TREND, GIVEN THE EXPECTED RETURN OF OLD
REGIONS 8340 (N19, L = 012) AND 8344 (S22, L = 007) ON 14 OCTOBER.
IIA. Geophysical Activity Summary 12-2100Z to 13-2100Z
THE GEOMAGNETIC FIELD WAS QUIET DURING MOST OF THE PERIOD. HOWEVER,
ACTIVITY INCREASED DURING 13/0900 - 1200UT WITH UNSETTLED TO ACTIVE
LEVELS DETECTED AT ALL LATITUDES AND MINOR STORM LEVELS DETECTED AT
A FEW HIGH LATITUDE STATIONS. THE GREATER THAN 2 MEV ELECTRON FLUX
AT GEOSYNCHRONOUS ALTITUDE REMAINED AT MODERATE TO HIGH LEVELS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE AT QUIET TO UNSETTLED LEVELS.
III. Event Probabilities 14 OCT to 16 OCT
| Class M | 20% | 20% | 20% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 13 OCT 118 Predicted 14 OCT-16 OCT 120/125/130 90 Day Mean 13 OCT 130
V. Geomagnetic A Indices
OBSERVED AFR/AP 12 OCT 003/006 ESTIMATED AFR/AP 13 OCT 007/008 PREDICTED AFR/AP 14 OCT-16 OCT 005/005-008/008-008/008
VI. Geomagnetic Activity Probabilities 14 OCT to 16 OCT
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 20% | 20% |
| Minor storm | 05% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
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