A Sun "Halo" in Tennessee

Dal "NASA - Picture of the Day" del 9 Marzo 2005:"Sometimes it looks like the Sun is being viewed through a large lens. In the above case there are actually millions of lenses: ice crystals. As water freezes in the upper atmosphere, small, flat, six-sided, ice crystals might be formed. As these crystals flutter down, much time is spent with their faces flat, parallel to the ground. An observer may pass through the same plane as many of the falling ice crystals near sunrise or sunset. During this alignment, each crystal can act like a miniature lens, refracting sunlight into our view. Dramatically visible behind neighborhood houses and trees and above the cloud deck is the 22° halo created by sunlight reflecting off of atmospheric ice crystals".
L'alone è spiegato in modo preciso ed accurato, ma esso non è l'unico fenomeno visibile in questa foto: alla Vostra Sx si vedono - e bene! - 2 scie chimiche. E quelle come le spieghiamo? Vapori e cristalli?!?