The aim of the ADAHELI Mission is to investigate the Sun's photospheric and chromospheric dynamics by performing observations in VIS-NIR bands and solar irradiance by acquisitions in the millimetric bands; the on-board instruments will be a millimeter band radiometer and a VIS-NIR high resolution telescope. The experiment with the NIR telescope is focused to study the highly dynamic and dishomogeneous atmospheric structure of the Sun, particularly in the chromospheric region that is the interface between the photosphere and the transition region at the base of solar corona. The continuous observations of a NIR telescope without the filter of the atmosphere will allow us to investigate for the first time these regions, helping us understand their structure, which is typical of all star atmospheres.