Next Article in Journal
Tailpipe VOC Emissions from Late Model Gasoline Passenger Vehicles in the Japanese Market
Previous Article in Journal
Possible Link Between Arctic Sea Ice and January PM10 Concentrations in South Korea
Open AccessArticle

Density Fluctuations in the Lower Thermosphere of Mars Retrieved From the ExoMars Trace Gas Orbiter (TGO) Aerobraking

1
European Space Agency, 64293 Darmstadt, Germany
2
Max Planck Institute for Solar System Research, 37077 Göttingen, Germany
3
Telespazio-VEGA Deutschland, 64293 Darmstadt, Germany
4
Department of Physics and Astronomy, Space Weather Lab, George Mason University, Fairfax, VA 22030, USA
*
Author to whom correspondence should be addressed.
Atmosphere 2019, 10(10), 620; https://doi.org/10.3390/atmos10100620
Received: 19 September 2019 / Revised: 6 October 2019 / Accepted: 11 October 2019 / Published: 15 October 2019
(This article belongs to the Special Issue Observations and Measurements of the Martian Atmosphere)
The upper atmosphere of Mars is constantly perturbed by small-scale gravity waves propagating from below. As gravity waves strongly affect the large-scale dynamics and thermal state, constraining their statistical characteristics is of great importance for modeling the atmospheric circulation. We present a new data set of density perturbation amplitudes derived from accelerometer measurements during aerobraking of the European Space Agency’s Trace Gas Orbiter. The obtained data set presents features found by three previous orbiters: the lower thermosphere polar warming in the winter hemisphere, and the lack of links between gravity wave activity and topography. In addition, the orbits allowed for demonstrating a very weak diurnal variability in wave activity at high latitudes of the southern winter hemisphere for the first time. The estimated vertical damping rates of gravity waves agree well with theoretical predictions. No clear anticorrelation between perturbation amplitudes and the background temperature has been found. This indicates differences in dissipation mechanisms of gravity waves in the lower and upper thermosphere. View Full-Text
Keywords: Mars atmosphere; atmospheric science; atmospheric dynamics; upper atmosphere Mars atmosphere; atmospheric science; atmospheric dynamics; upper atmosphere
Show Figures

Figure 1

MDPI and ACS Style

Jesch, D.; Medvedev, A.S.; Castellini, F.; Yiğit, E.; Hartogh, P. Density Fluctuations in the Lower Thermosphere of Mars Retrieved From the ExoMars Trace Gas Orbiter (TGO) Aerobraking. Atmosphere 2019, 10, 620.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop