Evidence of a long-term trend in total solar irradiance

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Volume 501 / No 3 (July III 2009)

A&A, 501 3 (2009) L27-L30

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Table 1:

Cycle amplitudes in units of the parameter and relative changes of minima in percent of the corrected amplitude during cycle 22.
Parameter	Cycle 20	Cycle 21	Cycle 22	Cycle 23
	Corrected cycle amplitude^a
TSI	...	0.9324	0.8601	0.8936
${B_{\rm R}}$	...	1.241	1.360	1.075
SSN	95.5	141.0	132.9	98.8
F10.7	76.9	125.6	120.7	96.2
Ly- $\alpha$	...	3.45	3.16	2.65
CaII K	...	0.01269	0.00987	0.00827
MgII	...	0.0176	0.0150	0.0138
	Change of minima over each cycle
TSI	...	5.6	$\mathsf{-}$ 14.2	-21.8
${B_{\rm R}}$	...	9.8	-23.7	-35.3
SSN	0.8	0.6	-3.7	-4.8
F10.7	-0.7	1.4	-0.0	-4.6
Ly- $\alpha$	...	-1.3	-2.9	-1.5
CaII K	...	-1.8	-2.7	-2.1
MgII	...	0.3	2.4	-1.4

^a Units are: TSI (Wm^-2), the open field at 1 AU ${B_{\rm R}}$ (nT), SSN (number), F10.7 (sfu $\equiv$ 10^-22 Wm^-2 Hz^-1), Ly- $\alpha$ (mWm^-2), CaII K and MgII indices (core-to-wing ratio). The amplitudes are equivalent sine-squared in units of the parameter, and the trend during each cycle is removed.

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