Depending on the age of the petroglyphs, would be directly or indirectly related to:

Characteristics for the Occurrence of a High-Current, Z-Pinch Aurora as Recorded in Antiquity (2003)

https://archive.org/details/anthony-peratt-characteristics-f...

Characteristics For The Occurrence Of A High Current Z Pinch Aurora As Recorded In Antiquity Part II: Directionality And Source (2007)

https://archive.org/details/characteristics-for-the-occurren...