The main layers of Titan’s upper atmosphere, and its illumination by solar UV (blue rays), solar visible light (yellow rays) and solar infrared light (red rays). The energy input from Saturn’s magnetospheric interaction shows a strong interaction with Titan’s atmosphere and the corresponding induced magnetosphere with draped magnetic field lines. The other energy sources (galactic cosmic rays, interplanetary dust) are also schematically shown. Adapted from Waite et al. (2004) and Sittler et al. (2009).