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We used ultraviolet (200 nm) images of the local spiral galaxies M33, M51,M81, M100, M101 to compute morphological parameters of galactic disks at thiswavelength : half-light radius $r_{hl}$, surface brightness distributions,asymmetries ($A$) and concentrations ($C_A$). The visibility and the evolutionof the morphological parameters are studied as a function of the redshift. Themain results are : local spiral galaxies would be hardly observed andclassified if projected at high redshifts (z $\ge$ 1) unless a strongluminosity evolution is assumed. Consequently, the non-detection of largegalactic disks cannot be used without caution as a constraint on the evolutionof galatic disks. Spiral galaxies observed in ultraviolet appear more irregularsince the contribution from the young stellar population becomes predominent.When these galaxies are put in a (log $A$ vs. log $C_A$) diagram, they move tothe irregul ar sector defined at visible wavelengths. Moreover, the log $A$parameter is degenerate and cannot be used for an efficient classification ofmorphological ultraviolet types. The analysis of high redshift galaxies cannotbe carried out in a reliable way so far and a multi-wavelength approach isrequired if one does not want to misinterpret the data.Comment: 12 pages, accepted for publication in A&A on 15 January 200

The ultraviolet visibility and quantitative morphology of galactic disks at low and high redshift