Saturday, October 06, 2012

Partial Halo CME on October 5th!

The link below presents views of a partial halo coronal mass ejection (CME) using images on October 5th from 06:30:07 UTC through 11:47:19 UTC. The video is compiled of images from the Solar Dynamics Observatory (SDO) and the Solar and Heliospheric Observatory (SOHO). The video was prepared by and posted to YouTube by contributor "otraLoly." Image Credit: SDO/AIA/SOHO


For the end of October 4th and most of October 5th, the solar activity was very low.  A long duration (7.5 hours) B7 x-ray event was observed on the 5th at 07:30 UTC. Post eruption loop structures were observed in GOES SXI imagery beginning at approximately 03:28 UTC in the vicinity of Active Region (AR 1584), in the southwest quadrant, shortly after the beginning of the B7 flare at 03:17 UTC. A partial halo coronal mass ejection (CME) was first observed in SOHO/LASCO C3 imagery at 07:30 UTC and STEREO A COR2 imagery at 04:09 UTC with an estimated plane-of-sky speed at 590 km/s. WSA-ENLIL model indicates this Earth-directed CME to become geoeffective late on the 8th. The forecast through October 8th: The solar activity is expected to continue at very low levels with the chance for a C-class flare.

Above Earth, the geomagnetic field was quiet. The forecast through October 8th: The geomagnetic field is expected to be mostly quiet on the 6th and 7th. Late on the 8th, today's CME is expected to affect Earth, causing unsettled to active conditions with a chance for minor storm periods. Stay tuned...

To monitor solar flare activity minute by minute, visit the "Today's Space Weather" page of NOAA's Space Weather Prediction Center (

To learn more about the sun and to stay current on solar activity, visit the mission home pages of the Solar Dynamics Observatory (SDO) (, the Solar and Heliospheric Observatory (SOHO) (, the Advanced Composition Explorer (ACE) (, and the Solar Terrestrial Relations Observatory (STEREO) (


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