Last major update issued on November 21, 2012 at 04:15 UTC.
The geomagnetic field was quiet to active on November 20. Solar wind speed at SOHO ranged between 350 and 477 km/s increasingly under the influence of a high speed coronal hole stream.
Solar flux measured at 20h UTC on 2.8 GHz was 141.2 (increasing 5.6 over the last solar rotation). The Potsdam WDC planetary A index was 15 (STAR Ap - based on the mean of three hour interval ap indices: 14.6). Three hour interval K indices: 33222343 (planetary), 23232333 (Boulder).
Region 11613 [S23W58] was quiet and stable.
Region 11614 [N14W47] decayed slowly and could soon become spotless.
Region 11616 [N20W16] decayed slowly and quietly.
Region 11617 [S17W71] reemerged with several spots.
Region 11618 [N08E13] developed in the central and trailing spot sections with significant polarity intermixing and a minor magnetic delta structure forming. Further M class flares are likely. Flares: long duration C3.0 peaking at 02:07, C3.9 at 06:33, C3.1 at 15:29 and M1.6 at 19:28 UTC.
Region 11619 [N10W12] decayed slowly and was mostly quiet.
New region 11620 [S12E57] rotated into view on November 18 and got its NOAA number on Nov.20.
S2059 [N08E19] was quiet and stable.
S2065 [N13E03] lost the spots observed the previous day and gained a trailing spot further north.
New region S2066 [S10E31] emerged with tiny spots.
November 18-19: No obviously Earth directed CMEs were observed in LASCO and STEREO imagery.
The geomagnetic field is expected to be quiet to unsettled on November 21-22 due to CH effects and quiet to active on November 23-24 due to CME effects.