The atmosphere structure and meteorology instrument on the Mars Pathfinder lander

An instrument on the Pathfinder lander has been designed to measure the structure of Mars' atmosphere during spacecraft entry and descent from ∼150 km altitude to the surface, and to measure meteorological parameters after landing for the landed duration of the mission. This is specified to be nominally 30 Mars days but potentially up to 1 Earth year. Landed sensors will measure surface level pressure; temperatures at 0.25, 0.5, and 1.0 m above the surface; and wind speed and direction at a height of 1.1 m. These sensors are mounted on a slender mast about 1.63 m from the center of the Lander base petal so as to avoid flow disturbance and thermal contamination insofar as possible. Wind sensing is most sensitive at velocities