These drawings were made by different artists living at different times. Some of them are 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...

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

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