摘要: Abstract Information on the direction of auroral arcs, mostly all sky camera data during IGY, has been collected and organized in a geomagnetic coordinate system, corrected by higher order spherical harmonic terms. By means interpolation integration between measured values it was possible to obtain curves polar plot representing arcs over region latitude range 64–90 degrees. The ovals do not follow latitudes. They are furthest from pole night-side e.g. 70.5° at 24, 79.9° 06, 79.2° 12 75.5° 18 hours. A small dawn-dusk asymmetry also observed, being closer 06 hours than In latitudes 80–85° for time interval around 1600 found that have an angle relative solar about 20 shape orientation corresponds (in zone region) with oval based occurrence aurora.
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