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Table 2 Uncertainties for D component

From: Uncertainty in hourly mean data from classical magnetometers

VariableValue of the variableUncertainty (\( \delta \)) of the variableTermUncertainty of the term
A (′)8737.10.05\( \left( {\delta A} \right)^{2} \)0.0025
B (′)13,342.80.1\( \left( {\delta B} \right)^{2} \)0.01
Az (′)4347.70.1\( \left( {\delta A_{Z} } \right)^{2} \)0.01
SD (′/mm)1.00.1\( \left( {\left( {n_{Dm} - n_{{D{\text{abs}}}} } \right)\delta S_{D} } \right)^{2} \)0.390625
nDabs (mm)18.50.1\( \left( {S_{D} \delta n_{Dm} } \right)^{2} \)0.01
nDm (mm)24.750.12\( (S_{D} \delta n_{{D{\text{abs}}}} )^{2} \)0.0144
   Total uncertainty Dm (′)0.6
  1. The dominant term is emphasized in italics