Abstract
From all-sky camera recordings taken at this Observatory (geographic co-ordinates 67.8° N., 20.4° E.; geomagnetic co-ordinates 65.3° N., 115.5° E.) during the period December 1958 – March 1961 the directions of 366 quiet auroral arcs were measured. Only arcs extending from horizon to horizon, or at least covering an angle of view of about 100° for the most distant arcs and having an elevation angle of more than 15° for the highest point, were used in the analysis.
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References
Störmer, C., The Polar Aurora (Oxford, 1955).
Alfvén, H., Cosmical Electrodynamics (Oxford, 1950).
Lassen, K., Nature, 184, 1375 (1959).
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HULTQVIST, B., EGELAND, A. & GUSTAFSSON, G. A Morning Discontinuity in the Orientation of Quiet Auroral Arcs. Nature 192, 956–957 (1961). https://doi.org/10.1038/192956a0
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DOI: https://doi.org/10.1038/192956a0
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