Correction of errors in scale values for magnetic elements for Helsinki

@inproceedings{Svalgaard2014CorrectionOE,
  title={Correction of errors in scale values for magnetic elements for Helsinki},
  author={Leif Svalgaard},
  year={2014}
}
Using several lines of evidence we show that the scale values of the geomagnetic variometers operating in Helsinki in the 19th century were not constant throughout the years of operation 1844–1897. Specifically, the adopted scale value of the horizontal force variometer appears to be too low by ∼ 30 % during the years 1866–1874.5 and the adopted scale value of the declination variometer appears to be too low by a factor of∼ 2 during the interval 1885.8–1887.5. Reconstructing the heliospheric… CONTINUE READING
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