Using a resonant scattering spectrophotometer the authors measured the radial velocity of the Sun at the K I 769.9 nm line with very high resolution and temporal stability. The observations carried out at Izaña (Tenerife) continuously for the last three years, have been used to search for solar g modes. Individual peaks, well above noise level, are

Despite theoretical predictions on the existence of solar gravity oscillations (g modes), their detection is still marginal. The main reasons are their frequencies, nu less than 0.2 mHz, and amplitudes of less than 10 cm/s. However, because these modes are extremely sensitive to the physical conditions in the very deep sun, they can give detailed

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The authors discuss the effects of multidimensional radiative transfer on the energy exchange by radiation in small-scale structures.

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