Preprints
https://doi.org/10.5194/hgss-2024-1
https://doi.org/10.5194/hgss-2024-1
01 Feb 2024
 | 01 Feb 2024
Status: this preprint is currently under review for the journal HGSS.

Early auroral photography and observations at the Sodankylä Geophysical Observatory in Finland, 1927–1929

Heikki Nevanlinna and Eija I. Tanskanen

Abstract. Auroral photography started in 1927 at the Sodankylä Geophysical Observatory (SGO) by the initiative of famous Norwegian scientist Carl Störmer. In less than two years about 600 photographs of auroras were taken at Sodankylä. Some of the images were obtained simultaneously at auxiliary stations for parallactic determinations of the height of auroral arcs. Most of the pictures of auroras were vanished in the destruction of the SGO during the war in 1944. About 200 images were rescued in the archive of the Finnish Meteorological Institute where they have been recently found. These pictures of auroras are the first ones taken in Finland.

During the Polar year period 1932–1933, auroral photographing was mostly discontinued but visual observations of auroras were made instead at several sites in Lapland.

Eyvind Sucksdorff's contribution to studies of auroras was a pioneering effort, with minimal resources. In Finland, regular observations of auroras started again during the International Geophysical Year (IGY) 1957–1958.

Heikki Nevanlinna and Eija I. Tanskanen

Status: open (until 29 Feb 2024)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on hgss-2024-1', Anonymous Referee #1, 04 Feb 2024 reply
    • AC1: 'Reply on RC1', H. Nevanlinna, 06 Feb 2024 reply
      • RC2: 'Reply on AC1', Anonymous Referee #1, 06 Feb 2024 reply
  • RC3: 'Comment on hgss-2024-1', Anonymous Referee #2, 15 Feb 2024 reply
    • AC2: 'Reply on RC3', H. Nevanlinna, 20 Feb 2024 reply
      • RC5: 'Reply on AC2', Anonymous Referee #2, 20 Feb 2024 reply
        • AC3: 'Reply on RC5', H. Nevanlinna, 20 Feb 2024 reply
  • RC4: 'Comment on hgss-2024-1', Anonymous Referee #3, 20 Feb 2024 reply
Heikki Nevanlinna and Eija I. Tanskanen
Heikki Nevanlinna and Eija I. Tanskanen

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Short summary
This paper deals with historical auroral photographs taken at the Sodankylä Geophysical Observatory (Finland) in 1927–1929. These photos are the first ones taken in Finland. The work was a co-operation with the Norwegian auroral team and Carl Störmer. The auroral material was recently found in the archive of the Finnish Meteorological Institute and is now published first time for the international scientific community.