The aurora shown in this figure is classified as arcs. The projection of the 557.7 nm emissions shown together with the phase scintillation index σ_ϕ over a map of Svalbard and geographical longitude/latitude on 28 October 2019 as seen from the NYA ASC for different time instances. Brighter yellow auroral emissions mean stronger intensity and bigger markers mean stronger σ_ϕ. The markers represent σ_ϕ measurements from NYA in red, LYR in green, HOR in cyan, HOP in magenta, and BJN in orange. In panel a geographic latitude and longitude gridlines are shown. The auroral intensity bar of the panel a (not shown) is the same as for the other panels in this figure. Panels a and b show the commencement of an auroral arc. Panels c and d show the arc at its maximum intensity (>80 kR). In panel d we can point out the very strongly elevated σ_ϕ poleward of the arc. Panels e and f show two auroral arcs and corresponding σ_ϕ values. Panels g and h show fading of the aurora and decrease in σ_ϕ. Even though panels a and h show similar auroral intensities (<30 kR) they show different levels of σ_ϕ: panel a – no elevated σ_ϕ, panel h – different levels of elevated σ_ϕ.