The Sky's for the Ancient Civilizations
were Far More Active than what we see Today
Anthony L. Peratt Plasma Lab Experiments
Plasmauniverse.info Near-earth plasma events in Ancient Times
A. L. Peratt,
Characteristics for the Occurrence of a High-Current, Z-Pinch Aurora
as Recorded in Antiquity, Trans. Plasma Sci. v.31, n.6, 2003,
And several other similar papers on petroglyphs (Plasma-glyphs).