Match the green fingers across Finland
Citizen skywatchers photographed a pattern missing from their guidebook. Their simultaneous views give you the starting point of the dunes investigation.
What to keep in mind
The two panels are annotated photographs from different towns. Numbered markers identify proposed correspondences; the height calculation needs calibrated stars and viewing directions, not resemblance alone.
Find matching structures
Compare the numbered green fingers in the two panels. Which correspondences look strongest, and which become difficult near the horizon?
Find the angular references
Locate stars around the aurora. Why do those references and the cameras’ simultaneous timing matter more for triangulation than matching image sizes?
What would test the wave explanation?
The photographs establish a spatial pattern. Which additional atmospheric observation would help test the proposed bore mechanism rather than simply repeat the shape?