Viewing archive of Thursday, 1 September 2005
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 2005 Sep 01 2204 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 244 Issued at 2200Z on 01 Sep 2005IA. Analysis of Solar Active Regions and Activity from 31-2100Z to 01-2100Z
Solar activity was very low. Region 806 (S16E07)
continues to decay and is now an Alpha class magnetic group. Region
803 (N10W26) is now a plage region without spots. A large, bright
full halo CME first seen in LASCO imagery at 31/2230 UTC was
determined to have occurred on the far side of the sun.
IB. Solar Activity Forecast
Solar activity is expected to be very
low to low. There is a fair chance for an isolated C-class event
from region 806.
IIA. Geophysical Activity Summary 31-2100Z to 01-2100Z
The geomagnetic field ranged from quiet to major storm levels. Minor
to major storm periods occurred between 31/2100 to 01/0600 UTC in
response to the corotating interaction region that became
geoeffective after 31/1000 UTC.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be at active to minor storm levels on 2 September.
Isolated major storming is possible due to the arrival of the full
halo CME associated with the long duration C2 flare on 31 August.
Predominantly active conditions are expected on 3 September,
decreasing to unsettled on 4 September.
III. Event Probabilities 02 Sep to 04 Sep
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 01 Sep 079 Predicted 02 Sep-04 Sep 080/080/085 90 Day Mean 01 Sep 093
V. Geomagnetic A Indices
Observed Afr/Ap 31 Aug 017/036 Estimated Afr/Ap 01 Sep 022/030 Predicted Afr/Ap 02 Sep-04 Sep 025/030-020/025-008/010
VI. Geomagnetic Activity Probabilities 02 Sep to 04 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 45% | 35% | 15% |
| Minor storm | 25% | 20% | 10% |
| Major-severe storm | 15% | 10% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 40% | 40% | 20% |
| Minor storm | 30% | 25% | 10% |
| Major-severe storm | 20% | 15% | 05% |
All times in UTC
Currently there's no noteworthy space weather
Latest news
Tuesday, 15 April 2025
CME arrival, G3 storm watch
Friday, 28 March 2025
X1.1 solar flare
Monday, 24 March 2025
Coronal hole faces Earth
Latest forum messages
Filaments and prominences 92AR4070 8Space Weather Memes 695Unspecified geomagnetic activity 2315Incoming & Unnumbered Active Regions 1803
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!
Latest alerts
Tuesday, 22 April 2025
11:09 UTC - Solar flare
Moderate M1.35 flare
10:39 UTC - Radio Blackout
Minor R1 radio blackout in progress (≥M1 - current: M1.03)
Monday, 21 April 2025
20:45 UTC - Geomagnetic activity
Minor G1 geomagnetic storm (Kp5) Threshold Reached: 20:33 UTC
18:57 UTC - Solar flare
Moderate M1.99 flare
18:39 UTC - Radio Blackout
Minor R1 radio blackout in progress (≥M1 - current: M1.93)
Space weather facts
| Last X-flare | 2025/03/28 | X1.1 |
| Last M-flare | 2025/04/22 | M1.3 |
| Last geomagnetic storm | 2025/04/21 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| March 2025 | 134.2 -20.4 |
| April 2025 | 121 -13.2 |
| Last 30 days | 113 -27.2 |