Long-term changes of sodium column abundance at 24.6°S above the Atacama Desert in Chile

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Table 2

C_Na fitting coefficients for Paranal dataset, with or without the solar cycle influence.

Fit parameters	Units	PAR All W solar cycle	PAR All W/o solar cycle	Monthly W solar cycle	Monthly W/o solar cycle
α	[10¹³ atoms/m²]	3.96±0.21	4.12 ± 0.1	4.23 ± 1.24	3.88 ± 0.44
$A_{a n n u a l} = \sqrt{A_{1}^{2} + A_{2}^{2}}$ $\[A_{annual}=\sqrt{A_1^2+A_2^2}\]$	[10¹³ atoms/m²]	1.09 ± 0.14	1.09 ± 0.14	1.08 ± 0.57	1.09 ± 0.56
ϕ_annual = atan(A₁/A₂)	[deg]	164.6 ± 0.54	164.9 ± 0.54	164.8 ± 2.1	165.3 ± 2.2
$A_{s e m i a n n u a l} = \sqrt{A_{3}^{2} + A_{4}^{2}}$ $\[A_{semiannual}=\sqrt{A_3^2+A_4^2}\]$	[10¹³ atoms/m²]	0.50 ± 0.14	0.50 ± 0.14	0.44 ± 0.36	0.44 ± 0.36
ϕ_semiannual = atan(A₃/A₄)	[deg]	140.7 ± 1.1	141.0 ± 0.95	140.2 ± 3.3	140.0 ± 3.5

δ	[% per 100 SFU]	4.2 ± 0.3		−7.8 ± 1.1
R² (goodness of fit)		0.18	0.18	0.39	0.38
Data correlation		0.96	0.96	0.39	0.38

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