Cassini UVIS observations revealed recently the presence of small - scale structures in the
dayside main
auroral emissions indicative of magnetopause Kelvin - Helmholtz instabilities, which are key elements of the solar wind - magnetosphere viscous interaction (Grodent et al. 2011).
In the colour - coded image, which simultaneously shows
dayside and nightside
auroral activity, the most intense levels of activity are red, and the lowest levels are blue.