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Solar Physics

, Volume 231, Issue 1–2, pp 157–166 | Cite as

Auroras Observed in Portugal in Late 18th Century Obtained from Printed and Manuscript Meteorological Observations

  • JosÉ M. Vaquero
  • Ricardo M. Trigo
Article

Abstract

We present a new catalogue of observations of the aurora borealis at Lisbon, i.e., at low-latitudes, in the late 18th century by Jacob Præ torius and Henrique Schulze, two German artillery officers. Dates of 18 auroras compiled by Præ torius and Schulze are compared with those published in other catalogues for that period. The number of annual auroras observed by the two Germans is then compared with two indices of solar activity showing a very good level of consistency between all time series. Finally, we have assessed the number of auroras observed taking into consideration the phase of the lunar cycle and the geomagnetic latitude of Lisbon.

Keywords

Time Series 18th Century Solar Activity Good Level Late 18th Century 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science + Business Media, Inc. 2005

Authors and Affiliations

  1. 1.Departamento de Física, Escuela PolitécnicaUniversidad de ExtremaduraCáceresSpain
  2. 2.Centro de Geofísica da Universidade de LisboaLisbonPortugal
  3. 3.Departamento de Eng. Civil da Universidade LusófonaLisbonPortugal

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