Mars Perseverance Sol 965 – Left Navigation Camera: A halo imaged on sol 965, in the final image taken by Perseverance’s Navigation cameras before conjunction and the end of the cloudy season. Credit: NASA/JPL-Caltech.’s Perseverance Mars rover can be challenging! Imagine spotting an interesting cloud in a photo taken yesterday; unlike something interesting on the surface, more observations just aren’t possible, as it’s long gone by now.
The fact that many atmospheric phenomena are short-lived and/or hard to predict, and often only occur during certain time periods, means that atmospheric scientists on the Mars 2020 team must use different strategies to observe them.Firstly, the sensors that make up the primary atmospheric instrument make meteorological and related observations continuously at least every other hour of every sol. This gives us a very good chance of capturing transient and hard-to-predict phenomena.
Secondly, for sensors that can’t measure as often — like the cameras and microphone — we take measurements over multiple sols at different times and directions, to build up statistics on when and where interesting phenomena occur.Thirdly, when we expect to see something unusual based on the time of year or location, we increase the cadence of measurements to make sure we capture that event. In Perseverance’s first year on Mars we observed a scattering halo toward the end of Mars’s cloudy season.
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