Viewing archive of Friday, 12 September 2014
Daily bulletin on solar and geomagnetic activity from the SIDC
Issued: 2014 Sep 12 1251 UTC
SIDC Forecast
Solar flares
Active (M-class flares expected, probability >=50%)
Geomagnetism
Severe magstorm expected (A>=100 or K>=7)
Solar protons
Proton event in progress (>10 MeV)
| 10cm flux | Ap | |
|---|---|---|
| 12 Sep 2014 | 158 | 034 |
| 13 Sep 2014 | 162 | 063 |
| 14 Sep 2014 | 164 | 008 |
Bulletin
Over the last 24 hours, 2 M-class flares were produced by a currently unnumbered region at the northeast limb: an M2.1 flare peaking at 15:26UT, and an M1.4 flare peaking at 21:26UT. NOAA 2157 and 2158 produced 2 C-class flares each. The strongest was a C9.5 flare peaking at 02:24UT in NOAA 2157. Both of these regions have no longer a delta structure, but spots of opposite magnetic polarity are still close together. Based on the currently available imagery, no CMEs seem to have been associated to these flares. M-class flares are expected, with a chance on an X-class event. On 11 September around 23:00UT, ACE observed a shock in the solar wind. Wind speed abruptly changed from about 350 to 480 km/s. Bz oscillated between -14 and +11nT. This was the arrival of the halo CME related to the M4-flare from 9 September. The impact resulted in active geomagnetic conditions (Dourbes), while Kp reached minor geomagnetic storm levels. Also the proton flux slightly increased. The arrival of the halo CME from the X1 flare is expected for later today. Pending the orientation of the CME's magnetic field, this may result in a major geomagnetic storm, with locally severe geomagnetic storming possible.
Today's estimated international sunspot number (ISN): 091, based on 16 stations.Solar indices for 11 Sep 2014
| Wolf number Catania | 208 |
| 10cm solar flux | 151 |
| AK Chambon La Forêt | 026 |
| AK Wingst | 011 |
| Estimated Ap | 013 |
| Estimated international sunspot number | 113 - Based on 18 stations |
Noticeable events summary
| Day | Begin | Max | End | Loc | Strength | OP | 10cm | Catania/NOAA | Radio burst types |
|---|---|---|---|---|---|---|---|---|---|
| 11 | 2101 | 2126 | 2130 | ---- | M1.4 | --/---- |
Provided by the Solar Influences Data analysis Center© - SIDC - Processed by SpaceWeatherLive
All times in UTC
Current data suggests there is a moderate possibility for aurora to appear at the following high latitude regions in the near future
ReykjavikCurrent data suggests there is a slight possibility for aurora to appear at the following high latitude regions in the near future
TórshavnOulu, Rovaniemi, Kuopio, Sodankylä
Trondheim
Arkhangelsk
Kiruna, Luleå, Sundsvall, Umeå
Latest news
X1.1 solar flare
Coronal hole faces Earth
Strong G3 geomagnetic storm watch for 23 March
Latest forum messages
Support 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
23:00 UTC - Geomagnetic activity
Active geomagnetic conditions (Kp4) Threshold Reached: 22:47 UTC
20:45 UTC - Hemispheric Power Index
The OVATION model predicts the Hemispheric Power Index to reach 50GW at 21:37 UTC
01:45 UTC - Geomagnetic activity
Active geomagnetic conditions (Kp4) Threshold Reached: 01:41 UTC
Wednesday, 9 April 2025
08:12 UTC - Hemispheric Power Index
The OVATION model predicts the Hemispheric Power Index to reach 76GW at 08:57 UTC
02:00 UTC - Geomagnetic activity
Minor G1 geomagnetic storm (Kp5) Threshold Reached: 01:45 UTC
Space weather facts
| Last X-flare | 2025/03/28 | X1.1 |
| Last M-flare | 2025/04/08 | M1.5 |
| Last geomagnetic storm | 2025/04/06 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| March 2025 | 134.2 -20.4 |
| April 2025 | 144.7 +10.5 |
| Last 30 days | 138.8 +1.3 |