Beautiful photography, very well written article.
Noted the absence of "jouney management" as espoused by any organisations (like oil companies) working in the wilderness. One should always leave a record of his planned route and an expected time of return, e.g. with the hotel receptionist. At least then a failure to return should trigger a search in the correct area. I was involved some years back in a 3-day areal search (with planes) looking for somebody who drove off on his rest day into the desert without telling anyone where to. The search had to be spread over hundreds of square km, needlessly. He was found finally, dead from exhaustion (he still had a half litre of water) by a Bedouin tracker just a few km from his vehicle (cracked sump that drained all the oil) and only 11 km from a main road (that was blocked from his view by a mountain range). If there was no mountain range he would have been able to see lights at night rather than spending his waning energy walking in circles. Write down your journey management for the hotel receptionist...
On another note. Since aurorae are line spectra surely it would make sense in more light-polluted regions to shoot them with narrowband filters? A number of narrowband filters are available to amateur astronomers that pass, say, OIII and H-beta plus H-alpha (Astronomik UHC could be an example). Personally I have never seen an aurora