Viewing archive of Sunday, 11 August 2013
Daily bulletin on solar and geomagnetic activity from the SIDC
Issued: 2013 Aug 11 1209 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 | |
|---|---|---|
| 11 Aug 2013 | 103 | 007 |
| 12 Aug 2013 | 105 | 014 |
| 13 Aug 2013 | 106 | 011 |
Bulletin
There are currently 6 numbered AR on the solar disk. Solar activity was mostly quiet, but counted 2 low C-class flares both from AR NOAA 1818. Activity is expected to remain mostly quiet although an isolated C-class flare is possible. Geomagnetic conditions where quiet to active in the last 24 hours. In the evening of August 12th active conditions are expected due to the arrival of the CME of August 7th.
Today's estimated international sunspot number (ISN): 053, based on 17 stations.Solar indices for 10 Aug 2013
| Wolf number Catania | /// |
| 10cm solar flux | 103 |
| AK Chambon La Forêt | /// |
| AK Wingst | 008 |
| Estimated Ap | 007 |
| Estimated international sunspot number | 047 - Based on 17 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
X1.5 solar flare
M2.7 solar flare, CME arrival possible
Complex sunspot region 4366
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 | 2026/03/30 | X1.5 |
| Last M-flare | 2026/04/04 | M1.0 |
| Last geomagnetic storm | 2026/04/03 | Kp7- (G3) |
| Spotless days | |
|---|---|
| Last 365 days | 3 days |
| 2026 | 3 days (3%) |
| Last spotless day | 2026/02/24 |
| Monthly mean Sunspot Number | |
|---|---|
| March 2026 | 85.9 +7.7 |
| April 2026 | 128.3 +42.3 |
| Last 30 days | 97.5 +35.7 |