Several days after the flame front has passed through a Miombo understory,
there is still smoke being produced by a process known as residual smoldering
combustion. These emissions are perhaps 10% of the total emissions and cannot be
sampled from the air so we are making ground-based measurements of the emissions here.
The battery in the foreground powers the spectrometer, which draws 4A, for up to 8 hr.
The system computer is powered by the battery of a running truck parked well downwind
through an extension cord and an AC/DC converter. For a few trace gases the emissions
from this type of combustion are quite different than during the plume-forming phase.