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

Open Access

Table 3

C_Na fitting coefficients for the monthly medians of all data sets together, with or without the solar cycle influence.

Fit parameters	Units	PAR+SCIAMACHY+OSIRIS Monthly W solar cycle	PAR+SCIAMACHY+OSIRIS Monthly W/o solar cycle
α	[10¹³ atoms/m²]	4.11 ± 0.66	4.00 ± 0.23
$A_{a n n u a l} = \sqrt{A_{1}^{2} + A_{2}^{2}}$ $\[A_{annual}=\sqrt{A_1^2+A_2^2}\]$	[10¹³ atoms/m²]	0.96 ± 0.32	0.96 ± 0.31
ϕ_annual = atan(A₁/A₂)	[deg]	187.1 ± 1.8	187.1 ± 1.8
$A_{s e m i a n n u a l} = \sqrt{A_{3}^{2} + A_{4}^{2}}$ $\[A_{semiannual}=\sqrt{A_3^2+A_4^2}\]$	[10¹³ atoms/m²]	0.30 ± 0.23	0.31 ± 0.23
ϕ_semiannual = atan(A₃/A₄)	[deg]	143.1 ± 1.9	143.3 ± 1.9

δ	[% per 100 SFU]	−2.9 ± 1.9
R² (goodness of fit)		0.54	0.54

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