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Context: Measuring amplitudes of solar-like oscillations and the granulationpower spectral density constitute two promising sources of information toimprove our understanding and description of the convection in outer layers ofstars. However, different instruments, using different techniques and differentbandpasses, give measurements that cannot be directly compared to each other orto theoretical values. Aims: In this work, we define simple response functionsto derive intrinsic oscillation amplitudes and granulation power densities,from photometry measurements obtained with a specific instrument on a specificstar. Methods: We test this method on different photometry data sets obtainedon the Sun with two different instruments in three different bandpasses.Results: We show that the results are in good agreement and we establishreference intrinsic values for the Sun with photometry. We also compute theresponse functions of the CoRoT instrument for a range of parametersrepresentative of the Main Sequence solar-like pulsators to be observed withCoRoT. We show that these response functions can be conveniently described bysimple analytic functions of the effective temperature of the target star.

Intrinsic photometric characterisation of stellar oscillations and granulation. Solar reference values and CoRoT response functions