Viewing archive of Monday, 11 September 2000
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 2000 Sep 11 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 11 SEP 2000IA. Analysis of Solar Active Regions and Activity from 10-2100Z to 11-2100Z SOLAR ACTIVITY WAS LOW. REGION 9154 (S17W91) WAS THE
PRIMARY SOURCE OF SEVERAL LOW LEVEL C-CLASS FLARES AS IT APPROACHED
THE WEST LIMB. THE LARGEST WAS A C4/SF AT 11/0715Z. REGION 9158
(N29E19), UNIMPRESSIVE NOW IN WHITE LIGHT WITH NO SPOTS VISIBLE,
PRODUCED A C1/SF FLARE AT 11/1810Z. SEVERAL SEGMENTS OF A LARGE
FILAMENT IN THE NW QUADRANT HAVE DISAPPEARED, BUT THERE IS NO
INDICATION OF A CME, ON GROUND OR SPACE-BASED IMAGERY. NEW REGION
9161 (N06E04) WAS NUMBERED TODAY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW.
REGION 9154 STILL MAINTAINS BEST POTENTIAL FOR C-CLASS ACTIVITY AS
IT ROTATES AROUND THE WEST LIMB. WITH REGION 9154'S DEPARTURE, SOLAR
ACTIVITY MAY REACH VERY LOW LEVELS.
IIA. GEOPHYSICAL ACTIVITY SUMMARY 10/2100Z TO 11/2100Z:
THE GEOMAGNETIC FIELD WAS QUIET.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE MOSTLY QUIET TO UNSETTLED WITH OCCASIONAL ACTIVE
PERIODS ON DAY ONE. EFFECTS FROM THE 09 AUG, M1/1N FLARE ARE
POSSIBLE ON DAY ONE.
III. Event Probabilities 12 SEP to 14 SEP
| Class M | 10% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 11 SEP 135 Predicted 12 SEP-14 SEP 130/125/125 90 Day Mean 11 SEP 179
V. Geomagnetic A Indices
OBSERVED AFR/AP 10 SEP 002/005 ESTIMATED AFR/AP 11 SEP 003/005 PREDICTED AFR/AP 12 SEP-14 SEP 012/012-008/010-005/005
VI. Geomagnetic Activity Probabilities 12 SEP to 14 SEP
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 30% | 20% |
| Minor storm | 15% | 15% | 05% |
| Major-severe storm | 05% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 40% | 35% | 25% |
| Minor storm | 20% | 20% | 10% |
| Major-severe storm | 05% | 05% | 05% |
All times in UTC
Latest news
Friday, 14 November 2025
X4.0 solar flare
Tuesday, 11 November 2025
X5.1 solar flare, G4 geomagnetic storm watch
Monday, 10 November 2025
X1.2 solar flare with earth-directed CME
Latest forum messages
Sunspot region 4274 822Space Weather Memes 754Incoming & Unnumbered Active Regions 2163Unspecified geomagnetic activity 3303Space Weather Analyst 11
More topicsSupport SpaceWeatherLive.com!
A lot of people come to SpaceWeatherLive to follow the Solar activity or if there is a chance to see the aurora, but with more traffic comes higher costs to keep the servers online. If you like SpaceWeatherLive and want to support the project you can choose a subscription for an ad-free site or consider a donation. With your help we can keep SpaceWeatherLive online!
Space weather facts
| Last X-flare | 2025/11/14 | X4.0 |
| Last M-flare | 2025/11/16 | M3.1 |
| Last geomagnetic storm | 2025/11/13 | Kp7+ (G3) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| October 2025 | 114.6 -15.2 |
| November 2025 | 95.6 -19 |
| Last 30 days | 93.4 -40.6 |