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Seasonal flows on warm slopes, or recurring slope lineae ("RSL"), have beenpresented as strong evidence for currently flowing water on Mars. Thisassumption was supported by a correlation between activity and warmtemperatures, and by the spectral identification of hydrated salts. Here wefirst demonstrate that salts spectral identification is not robust, and thatflow activity occurs on a wider range of seasons and slope orientations thanpreviously thought, ruling out liquid water as a probable contributor. We thenshow that morphology, location and timing of flow activity is fully consistentwith the removal and deposition of bright dust above darker underlying surfacesoccurring notably in relation with seasonal dust storm activity. Mars recurringslope lineae are thus consistent with dust movements typical of present-day dryplanet Mars.

Observational evidence for a dry dust-wind origin of Mars seasonal dark flows