Active Region 2158 produced a long duration M4.5 solar flare on September 9, 2014. The event started at 23:12, peaked at 00:29 and ended at 01:31 UTC.
A Type II (999 km/s) and IV radio emissions as well as 10cm Radio Burst were associated with the event. Coronal Mass Ejection (CME) is visible in the LASCO C2 imagery and it appears it might deliver a glancing blow to our planet in a couple of days.
Region 2158 has 'beta-gamma-delta' magnetic configuration and is capable of producing strong to major eruption on the Sun.
NOAA SWPC forecasters estimate 75% for M-class and 30% chance for X-class solar flares in the next two days.
SOHO/LASCO C2 with SDO/AIA 131. Annotation by TW.
Space Weather Message Code: ALTTP4
Serial Number: 476
Issue Time: 2014 Sep 09 0100 UTC
ALERT: Type IV Radio Emission
Begin Time: 2014 Sep 08 2340 UTC
Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.
Space Weather Message Code: ALTTP2
Serial Number: 959
Issue Time: 2014 Sep 09 0059 UTC
ALERT: Type II Radio Emission
Begin Time: 2014 Sep 09 0019 UTC
Estimated Velocity: 999 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.
Space Weather Message Code: SUM10R
Serial Number: 626
Issue Time: 2014 Sep 09 0028 UTC
SUMMARY: 10cm Radio Burst
Begin Time: 2014 Sep 08 2349 UTC
Maximum Time: 2014 Sep 08 2352 UTC
End Time: 2014 Sep 08 2359 UTC
Duration: 10 minutes
Peak Flux: 370 sfu
Latest Penticton Noon Flux: 164 sfu
Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.
There are currently 9 numbered sunspot regions on the disk.
Region 2157 (S14E17, Ekc/beta-gamma-delta) and 2158 (N15E28, Dkc/beta-gamma-delta) remain the largest and most complex regions on the disk although Region 2158 has remained quiescent since it rotated onto the east limb last week. Region 2157 exhibited very slight penumbral decay in last 24 hours but appeared to have developed a more complex magnetic configuration. Region 2158 showed moderate penumbral growth and exhibited a degree of magnetic sheering and mixing along its inversion line. The other regions on the visible disk were either stable or in decay.
Sunspots on September 9, 2014. Image credit: NASA SDO / HMI
2152 - Alpha
2155 - Beta
2157 - Beta-Gamma-Delta
2158 - Beta-Gamma-Delta
2159 - Beta
2160 - Beta
2161 - Alpha
2162 - Alpha
2163 - Beta
Featured image credit: NASA SDO / AIA Composite