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Abstract
<p class="first" id="P1">Spirit rover solar array data, which if publicly-archived
would provide a useful window
on Mars meteorology, shows dust-clearing events coinciding with the onset of dust
devil season in three Mars years. The recurrence interval of 100–700 days is consistent
with the extrapolation of Pathfinder and Phoenix vortex encounters indicated by pressure
drops of ~6–40 Pa (similar to laboratory measurements of dust lifting threshold) and
with observed areas and rates of generation of dust devil tracks on Mars.
</p>