– NASAInSight (@ NASAInSight) December 7, 2018
The audio was received by the atmospheric pressure sensor and the seismometer on the InSight board. The air pressure sensor directly detects airborne vibrations while the seismometer detects vibrations caused by the wind on Mars, blowing through InSight's solar panels. Scientists estimate that the wind blows between 10 and 15MPH.
"The InSight Inspector acts as a huge ear," says Tom Pike, part of InSight's research team. "Reactor solar panels respond to fluctuations in wind pressure, as InSight clings to their ears and hears that the wind on Mars is on it." When we look at the direction of the earth vibrations coming from the solar panels, the expected direction of the wind in our landing. "