Magnetic field and plasma data of Helios 1 and 2 between 0.3 and 1 AU have been used to investigate the Alfv¿nic character of the solar wind fluctuations with periods above 1 hour. Clear evidence for the existence of very long period Alfv¿n waves, up to ~15 hours (in the spacecraft frame) close to the sun, has been obtained. The observations at different heliocentric distances suggest that the longest wavelengths are removed from the Alfv¿nic regime leaving the sun.