As it is being lost to space, gas is removed from the top of the upper atmosphere, but it is the thicker lower atmosphere that controls the climate.
"During normal science mapping, we make measurements between an altitude of about 150km and 6,200km above the surface," said Bruce Jakosky, MAVEN principal investigator at the University of Colorado.
"During the deep-dip campaigns, we lower the lowest altitude in the orbit to about 125km which allows us to take measurements throughout the entire upper atmosphere," he said.
The first deep dip campaign ran February 10 to February 18.
MAVEN is the first mission dedicated to studying the upper atmosphere of Mars.
The spacecraft launched Nov. 18, 2013, from Cape Canaveral Air Force Station in Florida and entered Mars’ orbit on Sept. 21, 2014.
