Viewing archive of Monday, 23 September 2013
Daily bulletin on solar and geomagnetic activity from the SIDC
Issued: 2013 Sep 23 1304 UTC
SIDC Forecast
Solar flares
Quiet conditions (<50% probability of C-class flares)
Geomagnetism
Quiet (A<20 and K<4)
Solar protons
Quiet
| 10cm flux | Ap | |
|---|---|---|
| 23 Sep 2013 | 115 | 006 |
| 24 Sep 2013 | 115 | 004 |
| 25 Sep 2013 | 115 | 005 |
Bulletin
The X-ray background radiation decreased near the bottom of the B-level. The probability for a C flare is low. The geomagnetic conditions are quiet: the total magnetic field is around 5 nT. The solar wind speed is below 400 km/s. We expect the quiet geomagnetic conditions to continue.
Today's estimated international sunspot number (ISN): 052, based on 17 stations.Solar indices for 22 Sep 2013
| Wolf number Catania | /// |
| 10cm solar flux | 111 |
| AK Chambon La Forêt | /// |
| AK Wingst | 005 |
| Estimated Ap | 005 |
| Estimated international sunspot number | 056 - Based on 20 stations |
Noticeable events summary
| Day | Begin | Max | End | Loc | Strength | OP | 10cm | Catania/NOAA | Radio burst types | |
|---|---|---|---|---|---|---|---|---|---|---|
| None | ||||||||||
Provided by the Solar Influences Data analysis Center© - SIDC - Processed by SpaceWeatherLive
All times in UTC
Latest news
X1.9 solar flare, Coronal hole faces Earth
X4.0 solar flare
X5.1 solar flare, G4 geomagnetic storm watch
Latest forum messages
Support 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 | 2025/12/01 | X1.9 |
| Last M-flare | 2025/12/04 | M6.0 |
| 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 | 175.4 +83.6 |
| Last 30 days | 107.3 +14.6 |