Figure 1
From: The ionospheric irregularities climatology over Svalbard from solar cycle 23
Position of the poleward and equatorward boundaries of the Feldestein auroral oval for quiet (IQ = 0, black lines) and disturbed conditions (IQ = 6, red lines) at 12 MLT (top), 6 MLT (right), 00 MLT (bottom) and 18 MLT (left). The corresponding UT time is also reported in the figure. Dashed lines indicate the field of view at 350 km spanned by the receivers located in Ny-Ålesund (black dot) considering an elevation angle mask of 30°.
