In-flight scalar calibration and characterisation of the Swarm magnetometry package

Earth, Planets and Space

Table 3 Estimated values for selected model parameters for all three Swarm satellites

Sat	Sensitivity/sensor temperature, \(s_{\mathrm{Tsensor}}\) (\(10^{-6}/{^\circ }\hbox {C}\))		Sensitivity/\(\beta\) angle, \(s_{\beta }\) (\(10^{-6}/{\deg }\))		Non-orthogonalities, \(u_{1,2,3}\) (arc-seconds)
	Pre-flight	Adjustment	Pre-flight	Adjustment	Pre-flight	Adjustment
Alpha	28.5	0.616	–	−0.125	102.386	−0.601
	28.8	0.780	–	0	217.403	−3.960
	28.3	0.945	–	0.012	−179.318	0.149
Bravo	28.3	1.168	–	−0.132	350.880	−0.558
	29.0	1.385	–	−0.003	62.432	−2.453
	28.8	1.602	–	−0.198	−147.060	1.608
Charlie	27.7	1.521	–	−0.090	139.140	0.094
	29.1	1.300	–	−0.038	−248.890	1.042
	28.4	1.076	–	−0.167	−109.960	0.805

The nT-equivalents of the adjustments in a \(50{,}000~\hbox {nT}\) ambient field are: \(s_{\mathrm{Tsensor}} = 10^{-6}/{^\circ }\hbox {C} \sim 1.25~\hbox {nT}\) (\(25^{\circ }\hbox {C}\) temperature swing), \(s_{\beta } = 0.1 \times 10^{-6}/{\deg } \sim {\pm }0.45~\hbox {nT}\) (\({\pm }90^\circ\)), \(u = 1~\mathrm {arc-second} \sim 0.242~\hbox {nT}\)