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

Jesch, D., Medvedev, A. S., Castellini, F., Yiğit, E., & Hartogh, P. (2019). Density Fluctuations in the Lower Thermosphere of Mars Retrieved From the ExoMars Trace Gas Orbiter (TGO) Aerobraking. Atmosphere, 10(10): 620. doi:10.3390/atmos10100620.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-DB1D-6 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-DB23-E
Genre: Journal Article

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 Creators:
Jesch, David, Author
Medvedev, Alexander S.1, Author              
Castellini, Francesco, Author
Yiğit, Erdal, Author
Hartogh, Paul1, Author              
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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Free keywords: Mars atmosphere; atmospheric science; atmospheric dynamics; upper atmosphere
 Abstract: 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.

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Language(s): eng - English
 Dates: 2019
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.3390/atmos10100620
 Degree: -

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Title: Atmosphere
Source Genre: Journal
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Publ. Info: Basel, Switzerland : MDPI AG
Pages: - Volume / Issue: 10 (10) Sequence Number: 620 Start / End Page: - Identifier: ISSN: 2073-4433
CoNE: https://pure.mpg.de/cone/journals/resource/2073-4433