Personally, I prefer to describe them as GREENISH,MISSHAPENED OR WEIRD-SHAPED, "RIPPLES" or BANDS of AURORA BOREALIS.

"ARTIC/NORTHERN LIGHTS" oer GUAM-WESTPAC SUNNY TROPIC ZONES.

Sometimes you don't even see "DA GREEN" = SHADE(S) THEREOF, JUST A "LINE(S)" IN THE SKY.

[Shaking fists angrily at SANTA, RUDOLPH + OWG PAULA "American Idol/Trip to Brazil" ABDUL here].