Viewing archive of Wednesday, 4 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 04 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 308 Issued at 2200Z on 04 NOV 1998IA. Analysis of Solar Active Regions and Activity from 03-2100Z to 04-2100Z SOLAR ACTIVITY WAS LOW. OVERALL THE AMOUNT OF ACTIVITY
HAS INCREASED APPRECIABLY SINCE YESTERDAY. REGION 8375 (N18W07) HAS
BEEN THE MOST ACTIVE REGION PRODUCING SIX C-CLASS FLARES AS WELL AS
SEVERAL OPTICAL SUBFLARES AND ONE 1N OPTICAL FLARE. A FULL HALO CME
WAS OBSERVED BY THE LASCO/SOHO SATELLITE AT 04/0418UT. THIS WAS IN
CONJUNCTION WITH A C5/SF PRODUCED BY REGION 8375. REGION 8375 IS THE
LARGEST AND MOST COMPLEX REGION ON THE SUN. CURRENTLY A DAI,
BETA-GAMMA SPOT GROUP. THIS REGION HAS INCREASED SLIGHTLY IN SIZE
AND THE SPOT COUNT HAS INCREASED FROM 22 TO 28. OTHER ACTIVE REGIONS
ARE 8376 (S27E15), 8378 (N14E63) AND 8379 (S18W28) ALL OF WHICH
PRODUCED AN OPTICAL SUBFLARE. REGION 8379 IS A NEW NUMBERED REGION
WITH A 5 SPOT CRO, BETA SPOT GROUP. ONE OTHER REGION WAS NUMBERED:
8380 (S20E65) WITH AN AXX, ALPHA SPOT.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN
LOW WITH POSSIBLE ISOLATED M-CLASS FLARING FROM REGION 8375.
IIA. Geophysical Activity Summary 03-2100Z to 04-2100Z
THE GEOMAGNETIC FIELD HAS BEEN QUIET.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED WITH POSSIBLE ACTIVE PERIODS. THE
CAUSE FOR THE POTENTIAL INCREASE IN GEOMAGNETIC ACTIVITY IS DUE TO A
PARTIAL HALO CME THAT WAS OBSERVED BY THE LASCO/SOHO SATELLITE ON
02/1354UT. THIS WAS IN CONJUNCTION WITH A C1/N1 FLARE IN REGION 8376
LOCATED AT S25E44 AT THAT TIME. THE FULL HALO CME OBSERVED TODAY AT
04/0418UT COULD POSSIBLY CAUSE GEOMAGNETIC ACTIVITY LATE ON NOVEMBER
6TH OR ON NOVEMBER 7TH.
III. Event Probabilities 05 NOV to 07 NOV
| Class M | 30% | 30% | 30% |
| Class X | 10% | 10% | 10% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 04 NOV 141 Predicted 05 NOV-07 NOV 145/150/150 90 Day Mean 04 NOV 132
V. Geomagnetic A Indices
OBSERVED AFR/AP 03 NOV 005/005 ESTIMATED AFR/AP 04 NOV ???/??? PREDICTED AFR/AP 05 NOV-07 NOV 020/???-020/???-010/???
VI. Geomagnetic Activity Probabilities 05 NOV to 07 NOV
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 35% | 15% |
| Minor storm | 15% | 15% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 50% | 50% | 20% |
| Minor storm | 25% | 25% | 15% |
| Major-severe storm | 01% | 01% | 01% |
IA. Analysis of Solar Active Regions and Activity from 03-2100Z to 04-2100Z SOLAR ACTIVITY WAS LOW. OVERALL THE AMOUNT OF ACTIVITY
HAS INCREASED APPRECIABLY SINCE YESTERDAY. REGION 8375 (N18W07) HAS
BEEN THE MOST ACTIVE REGION PRODUCING SIX C-CLASS FLARES AS WELL AS
SEVERAL OPTICAL SUBFLARES AND ONE 1N OPTICAL FLARE. A FULL HALO CME
WAS OBSERVED BY THE LASCO/SOHO SATELLITE AT 04/0418UT. THIS WAS IN
CONJUNCTION WITH A C5/SF PRODUCED BY REGION 8375. REGION 8375 IS THE
LARGEST AND MOST COMPLEX REGION ON THE SUN. CURRENTLY A DAI,
BETA-GAMMA SPOT GROUP. THIS REGION HAS INCREASED SLIGHTLY IN SIZE
AND THE SPOT COUNT HAS INCREASED FROM 22 TO 28. OTHER ACTIVE REGIONS
ARE 8376 (S27E15), 8378 (N14E63) AND 8379 (S18W28) ALL OF WHICH
PRODUCED AN OPTICAL SUBFLARE. REGION 8379 IS A NEW NUMBERED REGION
WITH A 5 SPOT CRO, BETA SPOT GROUP. ONE OTHER REGION WAS NUMBERED:
8380 (S20E65) WITH AN AXX, ALPHA SPOT.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN
LOW WITH POSSIBLE ISOLATED M-CLASS FLARING FROM REGION 8375.
IIA. Geophysical Activity Summary 03-2100Z to 04-2100Z
THE GEOMAGNETIC FIELD HAS BEEN QUIET.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED WITH POSSIBLE ACTIVE PERIODS. THE
CAUSE FOR THE POTENTIAL INCREASE IN GEOMAGNETIC ACTIVITY IS DUE TO A
PARTIAL HALO CME THAT WAS OBSERVED BY THE LASCO/SOHO SATELLITE ON
02/1354UT. THIS WAS IN CONJUNCTION WITH A C1/N1 FLARE IN REGION 8376
LOCATED AT S25E44 AT THAT TIME. THE FULL HALO CME OBSERVED TODAY AT
04/0418UT COULD POSSIBLY CAUSE GEOMAGNETIC ACTIVITY LATE ON NOVEMBER
6TH OR ON NOVEMBER 7TH.
III. Event Probabilities 05 NOV to 07 NOV
| Class M | 30% | 30% | 30% |
| Class X | 10% | 10% | 10% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 04 NOV 141 Predicted 05 NOV-07 NOV 145/150/150 90 Day Mean 04 NOV 132
V. Geomagnetic A Indices
OBSERVED AFR/AP 03 NOV 005/005 ESTIMATED AFR/AP 04 NOV 7/7 PREDICTED AFR/AP 05 NOV-07 NOV 20/12-20/15-15/10
VI. Geomagnetic Activity Probabilities 05 NOV to 07 NOV
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 35% | 15% |
| Minor storm | 15% | 15% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 50% | 50% | 20% |
| Minor storm | 25% | 25% | 15% |
| Major-severe storm | 01% | 01% | 01% |
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