Solar flaring activity is below the C-level during the last two days. An isolated C-class flare on the Sun is, however, possible. A partial halo CME (angular width around 180 degrees) was detected by SOHO/LASCO this morning. The CME is first seen in the LASCO C2 field of view at 00:24 UT after a 7-hour long data gap, so it is difficult to determine the eruption time precisely. The CME is first seen in the STEREO A COR2 field of view at 04:24 UT, also after a long data gap. STEREO data show that the partial halo CME is frontsided. GOES detected a long-duration B7.5 flare peaking at 07:32 UT (with a long rise time). SDO/AIA images show corresponding post-eruption loops in the NOAA AR 1584, as well as post-eruption loops connecting NOAA ARs 1582 and 1584. The CME speed measured in the LASCO data was around 550 km/s. The arrival of the corresponding ICME at the Earth can be expected early on October 9. A weak geomagnetic disturbance (up to K = 5) is possible. Currently the Earth is inside a slow (around 300 km/s) solar wind flow with average (around 5 nT) interplanetary magnetic field magnitude. We expect quiet geomagnetic conditions in the coming hours.

• published: 05 Oct 2012
• views: 295
• author: otraLoly