Fig. 4.

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Impact of the level of magnetic activity on the height of oscillations. Left: chromospheric emission index SCaII (colorscale and symbol size) as a function of oscillations frequency at maximum amplitude vmax (x-axis) and height of the Gaussian envelope employed to model the oscillation excess power Hmax (y-axis) for the 3008 red giants observed both by Kepler and LAMOST, for which Sph and vmax are available. The colorscale was cut at 0.4 for readability purposes, despite a few points reaching SCaII ≈ 0.8. Right: corresponding figure for Sph as measured by Gaulme et al. (2020).
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