Auroral Observations in Finland-Visual Sightings during the 18th and 19th Centuries

  title={Auroral Observations in Finland-Visual Sightings during the 18th and 19th Centuries},
  author={Heikki Nevanlinna},
  journal={Journal of geomagnetism and geoelectricity},
  • H. Nevanlinna
  • Published 20 October 1995
  • Geography
  • Journal of geomagnetism and geoelectricity
Systematic naked eye sightings of northern lights started in Finland in 1748. Such observations were carried out for about 100 years at two places in Southern Finland. All observations were compiled and published by Hallstrom (1847). Auroral occurrence frequencies in this compilation obey well the semiannual variation and the 11-year sunspot cycle when compared with other coeval auroral and magnetic data available in Europe. In the middle of the 100-year auroral series there was an anomalous… Expand
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