Letter | Published:

A Morning Discontinuity in the Orientation of Quiet Auroral Arcs

Nature volume 192, pages 956957 (09 December 1961) | Download Citation

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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

  1. 1.

    , The Polar Aurora (Oxford, 1955).

  2. 2.

    , Cosmical Electrodynamics (Oxford, 1950).

  3. 3.

    , Nature, 184, 1375 (1959).

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Author information

Affiliations

  1. Kiruna Geophysical Observatory, Kiruna C, Sweden.

    • BENGT HULTQVIST
    • , ALV EGELAND
    •  & GEORG GUSTAFSSON

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DOI

https://doi.org/10.1038/192956a0

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