The aurora shown in this figure is classified as a spiral. 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 29 January 2020 as seen from the LYR 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. Panel a shows elevated σ_ϕ values yet without strong Aurora. Panel b shows strong auroral emissions and is paired with elevated σ_ϕ values. In panels c, d, and e an auroral spiral has formed and the elevated σ_ϕ values are primarily observed at the boundary of the auroral spiral. In panel f elevated σ_ϕ values on top of the faded-out form.