Friday, September 28, 2012

C4 Flare on September 27th...

The above image was taken September 27th at 17:20:00 UTC by the Atmospheric Imaging Assembly (AIA), at 94 Angstroms, aboard the Solar Dynamics Observatory (SDO). This was during the time of a C4 solar flare, produced by an undesignated region on the southeastern (lower-left) portion of the sun's disc. Image Credit: SDO/AIA

For the end of September 26th and most of September 27th, the solar activity has been low. The largest solar flare was a C4 on the 27th at 17:20 UTC from an unnumbered region in the southeastern portion of the sun's disc. There are currently 9 numbered sunspot regions visible, but most have remained rather stable and quiet. A non-Earth directed full halo coronal mass ejection (CME) was observed in both STEREO A-B and LASCO imagery. The forecast through September 30th: The solar activity is expected to be at low levels with a slight chance for M-class activity.

Here at home, the geomagnetic field has been quiet. The forecast through September 30th: The geomagnetic field is expected to be predominantly quiet. 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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