Those are beautiful images. Makes me think about green meteors. I watched the
Leonid meteor shower in 1999 and there were many green fireballs including one which exploded in an enormous green flash and left a green streak across the sky which persisted for several seconds.
I believe that
meteors are analogous to comets - bits of rock that are subject to extreme electrical discharge as they pass into the Earth's magnetosphere. The Leonid meteor shower, so named because it radiates from the star gamma Leonis, is said to be caused as the dust from the tail of Comet 109P/Swift-Tuttle enters our atmosphere and burns up due to mechanical friction with air molecules as it passes into the mesosphere. I've seen a few
meteor showers, although none as spectacular as the storm in 1999, and I can't believe the finely granulated dust, that forms the tail of a comet, could cause such energetic displays. Perhaps the Earth's magnetosphere is being deformed, through an interaction with the magnetic field of the comet, causing the layers of the Earth's magnetosphere to be compressed and therefore increasing the relative electrical stress encountered by the usual "meteoric traffic" that enters the magnetosphere every day. And perhaps the green meteors are created when bits of space rock encounter this increased electrical stress in the ionosphere, playground of the Auroras, explosively discharging before they reach the mesosphere, where meteors traditionally become visible.
Cheers!
