A 34-mt-wide Dust Devil! - Sol 486 - detail mgnf/color

Da "Mars Daily", del 1°mo Giugno 2005:"(...) At the Pathfinder site during its 83rd Sol, approximately 30 Dust Devils were either sensed by the pressure drop as they passed over the Lander, or were imaged by the Pathfinder camera - says Peter Smith of the University of Arizona (Tucson).
'Based on these observations, one might expect to see several Dust Devils per hour from an active site on Mars between 10 am and 3 pm. Few - if any - Dust Devils will be present at other times. Dust Devils typically form during late Spring and Summer and can be found at all latitudes. Exactly, how their population density varies around the planet is currently unknown'.
In addition to Pathfinder's run-in with a Dust Devil, previous Missions to Mars have run into very dusty days. For instance, there was a dust storm covering the Viking Lander I site on Sol 1742 (1 Martian year=669 Earth days). In 1971, Mariner 9 as well as 2 USSR Missions all arrived during a dust storm! (...)".