Viewing archive of Saturday, 12 September 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 Sep 12 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 255 Issued at 2200Z on 12 SEP 1998IA. Analysis of Solar Active Regions and Activity from 11-2100Z to 12-2100Z SOLAR ACTIVITY WAS LOW. FOUR C-CLASS X-RAY EVENTS
OCCURRED DURING THE PAST 24 HOURS, THE LARGEST AN UNCORRELATED C3 AT
12/0753Z. REGIONS 8331 (N25E02) AND 8333 (N11W71) EACH GENERATED A
SINGLE C1/SF EVENT. REGION 8331 CONTINUES AS THE MOST COMPLEX ACTIVE
REGION ON THE VISIBLE DISK, AS A 25-SPOT 'EAI' BETA GROUP. REGION
8333, WHICH WAS THE SOURCE OF YESTERDAY'S M2/1B EVENT, IS CURRENTLY
A 5-SPOT 'DAO' BETA. NEW REGION 8335 (S22E68), A SMALL C-TYPE
GROUP, WAS NUMBERED TODAY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW.
IIA. Geophysical Activity Summary 11-2100Z to 12-2100Z
THE GEOMAGNETIC FIELD HAS BEEN QUIET TO UNSETTLED FOR THE PAST 24
HOURS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO REMAIN QUIET TO UNSETTLED FOR THE NEXT 12-24 HOURS, WITH
CONDITIONS DECREASING TO MOSTLY QUIET ON DAYS 2 AND 3.
III. Event Probabilities 13 SEP to 15 SEP
| Class M | 25% | 25% | 25% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 12 SEP 135 Predicted 13 SEP-15 SEP 130/125/125 90 Day Mean 12 SEP 125
V. Geomagnetic A Indices
OBSERVED AFR/AP 11 SEP 005/005 ESTIMATED AFR/AP 12 SEP 012/009 PREDICTED AFR/AP 13 SEP-15 SEP 010/009-005/009-005/009
VI. Geomagnetic Activity Probabilities 13 SEP to 15 SEP
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
Latest news
Saturday, 23 March 2024
X1.1 solar flare with earth-directed CME
Wednesday, 20 March 2024
Sunspot region 3615, G1 watch
Thursday, 22 February 2024
X6.3 solar flare
Latest forum messages
Unspecified geomagnetic activity 905GONG Farside Images added to the SWL site? 5Growth of Cycle 25 418Changelog/Featurelog 152Imagery from Total Solar Eclipse 08/04/2024 5
More topicsSupport SpaceWeatherLive.com!
A lot of people come to SpaceWeatherLive to follow the Sun's activity or if there is aurora to be seen, but with more traffic comes higher server costs. Consider a donation if you enjoy SpaceWeatherLive so we can keep the website online!
Space weather facts
| Last X-flare | 2024/03/28 | X1.1 |
| Last M-flare | 2024/04/19 | M1.0 |
| Last geomagnetic storm | 2024/04/16 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| March 2024 | 104.9 -19.8 |