Look at those Peratt papers.
Here are the links to the PDFs of three papers dealing with it. In a previous post I thought I had linked to the first (look at figures 36 and 37, for examples of human forms and faces and their similarities to different types of plasma discharges, eg. Kokopeli figures are found around the world, not just in the American Southwest), but it was to the second paper (look at Fig. 68 for an example of a figure with a face). The third paper is more of an amalgam of the first two but with additional material (see Fig. 13 for another type of face and a possible corresponding plasma source):
Characteristics for the Occurrence of a High-Current Z-Pinch Aurora as Recorded in Antiquity, Peratt AL, et al, IEEE TRANSACTIONS ON PLASMA SCIENCE, VOL. 31, NO. 6, DECEMBER 2003.
Characteristics for the Occurrence of a High-Current Z-Pinch Aurora as Recorded in Antiquity Part II: Directionality and Source, Peratt AL, et al, IEEE TRANSACTIONS ON PLASMA SCIENCE, VOL. 35, NO. 4, AUGUST 2007.
Evidence for an intense solar outburst in prehistory, AL Peratt, WY Yao, Phys. Scr. T131, 2008