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It has also been suggested that the detection of a wealth of very lowamplitude modes in Delta Sct stars was only a matter of signal--to--noiseratio. Access to this treasure, impossible from the ground, is one of thescientific aims of the space mission CoRoT, a space mission developed andoperated by CNES. This work presents the results obtained on HD 50844: the140,016 datapoints were analysed using independent approaches and severalchecks performed. A level of 10^{-5} mag was reached in the amplitude spectraof the CoRoT timeseries. The frequency analysis of the CoRoT timeseriesrevealed hundreds of terms in the frequency range 0--30 d^{-1}. All thecross--checks confirmed this new result. The initial guess that Delta Sct starshave a very rich frequency content is confirmed. The spectroscopic modeidentification gives theoretical support since very high--degree modes (up toell=14) are identified. We also prove that cancellation effects are notsufficient in removing the flux variations associated to these modes at thenoise level of the CoRoT measurements. The ground--based observations indicatethat HD 50844 is an evolved star that is slightly underabundant in heavyelements, located on the Terminal Age Main Sequence. Probably due to thisunfavourable evolutionary status, no clear regular distribution is observed inthe frequency set. The predominant term (f_1=6.92 d^{-1}) has been identifiedas the fundamental radial mode combining ground-based photometric andspectroscopic data. This work is also based on observations made with ESOtelescopes under the ESO Large Programme LP178.D-0361 and on data collected atthe Observatorio de Sierra Nevada, at the Observatorio Astronomico Nacional SanPedro Martir, and at the Piszkesteto Mountain Station of Konkoly Observatory.

HD 50844: the new look of Delta Sct stars from CoRoT space photometry