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Fig. 3


Magnetic activity proxies Sph,GREEN (in ppm) and Svel (in m s-1) measured from the photometric VIRGO/SPM GREEN channel (GREEN filled, left panels) and the radial velocity GOLF (BLUE filled, right panels) observations as a function of time and compared to standard indices of solar activity (solid black lines). From top to bottom, the total sunspot number (SN), total sunspot area (SA), 10.7-cm radio flux (F10.7-cm) in 10-22 s-1 m-2 Hz-1, Ca ii K-line line emission index in Å, and mean frequency shifts of the l = 0,1 and 2 acoustic oscillations (Δν) in μHz are shown. The red shaded areas in the right-hand panels represent the period when GOLF was observing in the red wing of the sodium line.

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