Last major update issued on August 12, 2012 at 06:55 UTC.
The geomagnetic field was quiet to unsettled on August 11. Solar wind speed at SOHO ranged between 286 and 355 km/s.
Solar flux measured at 20h UTC on 2.8 GHz was 119.7 (decreasing 20.8 over the last solar rotation). The Potsdam WDC planetary A index was 5 (STAR Ap - based on the mean of three hour interval ap indices: 5.3). Three hour interval K indices: 01111123 (planetary), 00112222 (Boulder).
Region 11537 [N13W68] decayed slowly and quietly.
Region 11538 [S23W75] decayed slowly and quietly.
Region 11540 [S25W48] decayed slowly. The region was the source of a long duration M1.0/2N event peaking at 12:20 UTC.
Region 11542 [S13E08] decayed slowly and still has a magnetic delta structure in a trailing penumbra. An M flare is possible.
Region 11543 [N21E20] was quiet and stable.
Region 11544 [S31W28] decayed further and was mostly quiet.
New region 11545 [S14W22] emerged on August 9 and was numbered by SWPC 2 days later. The region decayed slightly on August 11.
New region S1853 [S25E00] emerged with a tiny spot.
New region S1854 [S01W14] emerged with a tiny spot.
August 9-11: No obviously Earth directed CMEs were observed in LASCO and STEREO imagery.
A coronal hole (CH527) in the southern hemisphere was in an Earth facing position on August 9-10. A coronal hole (CH528) in the northern hemisphere was Earth facing on August 10-11. A recurrent coronal hole in the southern hemisphere will likely become Earth facing on August 15-16.
The geomagnetic field is expected to be quiet to unsettled on August 12-14 due to weak effects from CH527 and CH528.