se qualcuno vuole approfondire il discorso su ANGEL SPRITE
http://sprite.phys.ncku.edu.tw/publication/Angel%20Sprites.pdf
OBSERVATION OF ANGEL SPRITES
H. T. Su, R. R. Hsu, Alfred B. Chen, S. F. Chen, S. B. Mende, R. L. Rairden, T. H. Allin, and T.
Neubert
to appear in Cospar Colloquium Series Volume 12:Space Weather Study using Multipoint Techniques,
Elsevier (2002)