Viewing archive of Tuesday, 27 September 2011
Geophysical 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.
Solar and Geophysical Activity Summary 2011 Sep 27 0245 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Solar and Geophysical Activity Summary
SGAS Number 270 Issued at 0245Z on 27 Sep 2011 This report is compiled from data received at SWO on 26 SepA. Energetic Events
Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep 0001 0001 0001 110 0007 0007 0007 100 0011 0011 0017 1303 S28W77 Sf 120 0506 0508 0513 1302 N13E34 M4.0 1b 360 IV 1127 2222 IV 1128 1137 II 1437 1446 1502 1302 N14E30 M2.6 2b 1634 1635 1640 1302 N15E28 Sf IV 2228 2228 2228 1302 500 IV 2352 2352 2352 760
B. Proton Events
The greater than 10 MeV proton event that began
at 23/2255Z, reached a maximum of 35 pfu at 26/1115Z, and was in
progress at the end of the day.
C. Geomagnetic Activity Summary
Activity ranged from quiet to
severe storm levels.
D. Stratwarm
Not available
E. Daily Indices: (real-time preliminary/estimated values)
10 cm 148 SSN 103 Afr/Ap 020/067 X-ray Background C1.4 Daily Proton Fluence (flux accumulation over 24 hrs) GT 1 MeV 8.3e+07 GT 10 MeV 2.2e+06 p/(cm2-ster-day) (GOES-13 satellite synchronous orbit W75 degrees) Daily Electron Fluence GT 2 MeV 8.10e+06 e/(cm2-ster-day) (GOES-13 satellite synchronous orbit W75 degrees) 3 Hour K-indices Boulder 2 1 1 2 5 6 5 4 Planetary 1 0 ? 1 5 8 8 4
F. Comments
None
All times in UTC
Latest news
Sunday, 7 December 2025
M8.1 solar flare with earth-directed CME
Monday, 1 December 2025
X1.9 solar flare, Coronal hole faces Earth
Friday, 14 November 2025
X4.0 solar flare
Latest forum messages
AR4299 M8.1 CME 2025/12/06 250Geomagnetic Data / Monitoring 6AR 4299 152AR4294 / 4296 / 4298 437Sporadic E and Flare activity 36
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 | 2025/12/08 | X1.1 |
| Last M-flare | 2025/12/09 | M1.67 |
| Last geomagnetic storm | 2025/12/04 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| November 2025 | 91.8 -22.8 |
| December 2025 | 160.6 +68.8 |
| Last 30 days | 108.7 +12.8 |