Just posting the 'Official' information from Solen -
The geomagnetic field was quiet on December 18. Solar wind speed at SOHO ranged between 445 and 576 km/s under the influence of a high speed coronal hole stream.
Solar flux measured at 20h UTC on 2.8 GHz was 116.2 (decreasing 24.2 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: 12222201 (planetary), 12233211 (Boulder).
The background x-ray flux was at the class B4 level.
At midnight UTC the visible solar disk had 5 spotted active regions (in 2K resolution SDO images).
Region 11633 [S07E28] lost a few spots and decayed slowly. The leader spot split into two penumbrae.
Region 11634 [S13E30] was quiet and stable.New region 11635 [N10E76] rotated into view. The region seems to be fairly simple structured magnetically
Spotted regions not numbered by NOAA/SWPC:
S2116 [N11W05] was quiet and stable.
New region S2117 [S13E42] emerged to the east of AR 11634 [link to www.solen.info
It is worth remembering that the Above could change in a matter of Hours.
A little unfortunate that the new Region that came over the East limb 1635 must have burned itself out and is now considered to be of simple Magnetic Structure,it had looked very lively before rotating onto the Earth facing disk,typically hey!?