46. Which of the following is a necessary element for an aurora?
(A) a stream of polar wind
(B) solar collision with charged particles
(C) the conversion of kinetic energy
(D) the far-travelling corona of the sun

路過解個鎖 (第一段倒數第七行)

The collisions cause quantum leaps, which mean the kinetic energy within the electrons of the particles are converted to light.

擷取部分文章：最直接造成極光的原因應為(C)

(B) Charged particles within the solar winds collide with atmospheric atoms and molecules when they reach Earth’s magnetic field.

The collisions cause quantum leaps, which mean  (C)the kinetic energy within the electrons of the particles are converted to light.

下文：根據不同particle會有不同的色光

The collisions of different particles result in different colored lights. Atomic oxygen produces red and green lights, nitrogen produces pink, blue, or violet light, helium produces purple lights and neon produces rippled orange light.