Sketch of Sun-comet CX interactions. The upstream solar wind, composed of H⁺ and He²⁺ ions, experiences CX collisions when impacting the comet’s neutral atmosphere, producing a mixture of charged states downstream of the collision. Energetic neutral atoms (ENAs) are depicted in pink. χ is the solar zenith angle, r the cometocentric distance of a virtual spacecraft, and x points toward the comet-Sun direction, in cometocentric solar equatorial system coordinates. An increasingly deep blue denotes a correspondingly denser atmosphere.