Top three lines give information on the existence of aurorae in north, zenith and south ranges of the sky, respectively. The fourth and fifth lines in the standard five lines ascaplot give the zenith range auroral intensity. We do not use TV observations to form a correct estimate of the auroral intensity. 10- no operation TV keograms Black white keograms show the auroral display along the geomagnetic meridian of station. Zenith angles are given along the vertical axis.
Magnetic north is at the top of the figure.
The station symbol is indicated in the top right hand corner of each panel. Coordinates of stations Station Code Geogr. We are interested in what you think, so please send us your comments . Polar Geophysical Institute Fersmana st.