Photospheric activity of the Sun with VIRGO and GOLF - Comparison with standard activity proxies

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Table 1

Spearman’s correlation coefficients between the photometric VIRGO/SPM S_ph and the radial velocity GOLF S_vel magnetic proxies and standard indices of solar activity over 21 yr during Cycles 23 and 24.

Activity proxy	S _ph,BLUE	S _ph,GREEN	S _ph,RED	S _ph,composite	S _vel	SN^a	SA^b	F_10.7-cm^c	Ca ii K^d	Δν ^e

SN^a	0.86	0.84	0.86	0.84	0.88	n/a	0.98	0.99	0.98	0.92
SA^b	0.91	0.89	0.90	0.89	0.90	−	n/a	0.98	0.96	0.93
F_10.7-cm^c	0.88	0.86	0.88	0.86	0.90	−	−	n/a	0.98	0.94
Ca ii K^d	0.87	0.85	0.86	0.85	0.87	−	−	−	n/a	0.93
Δν ^e	0.89	0.87	0.89	0.88	0.86	−	−	−	−	n/a

Notes. and

^(a)

Total sunspot number;

^(b)

total sunspot area;

^(c)

10.7-cm radio flux;

^(d)

Ca ii K-line emission index;

^(e)

mean l = 0,1, and 2 frequency shifts.

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