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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 σϕ 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 σϕ. The markers represent σϕ measurements from NYA in red, LYR in green, HOR in cyan, HOP in magenta, and BJN in orange. Panel a shows elevated σϕ values yet without strong Aurora. Panel b shows strong auroral emissions and is paired with elevated σϕ values. In panels c, d, and e an auroral spiral has formed and the elevated σϕ values are primarily observed at the boundary of the auroral spiral. In panel f elevated σϕ values on top of the faded-out form.
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