Viewing archive of Monday, 28 September 2015
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 2015 Sep 28 0245 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Solar and Geophysical Activity Summary
SGAS Number 271 Issued at 0245Z on 28 Sep 2015 This report is compiled from data received at SWO on 27 SepA. Energetic Events
Begin Max End Rgn Loc Xray Op 245MHz 10cm Sweep 0146 0146 0148 200 0357 0359 0359 950 0750 0758 0806 2422 S21W07 C2.1 Sf 100 1020 1040 1046 2422 S22W08 M1.9 1f 1944 1958 2005 2422 S20W18 C9.3 1n 130 2025 2025 2025 150 2054 2100 2115 2422 S21W16 M1.0 1n 2240 2247 2251 2423 S10W69 Sf 100
B. Proton Events
None
C. Geomagnetic Activity Summary
The geomagnetic field was quiet.
D. Stratwarm
Not available
E. Daily Indices: (real-time preliminary/estimated values)
10 cm 128 SSN 154 Afr/Ap 004/004 X-ray Background B6.3 Daily Proton Fluence (flux accumulation over 24 hrs) GT 1 MeV 3.6e+05 GT 10 MeV 1.1e+04 p/(cm2-ster-day) (GOES-13 satellite synchronous orbit W75 degrees) Daily Electron Fluence GT 2 MeV 2.20e+07 e/(cm2-ster-day) (GOES-13 satellite synchronous orbit W75 degrees) 3 Hour K-indices Boulder 1 1 1 0 2 2 2 2 Planetary 1 1 0 1 1 1 2 2
F. Comments
None
All times in UTC
Latest news
Wednesday, 31 December 2025
Happy New Year! Celebrate with an M7.1 solar flare!
Sunday, 7 December 2025
M8.1 solar flare with earth-directed CME
Monday, 1 December 2025
X1.9 solar flare, Coronal hole faces Earth
Latest forum messages
CME from M7.1 Dec. 31st 47Unspecified geomagnetic activity 58AR14324 75Filaments and prominences 422AR 4325 22
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 | 2025/12/31 | M7.11 |
| Last geomagnetic storm | 2025/12/22 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| December 2025 | 124 +32.2 |
| January 2026 | 120 -4 |
| Last 30 days | 114.5 +16.4 |