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      High-altitude gravity waves in the Martian thermosphere observed by MAVEN/NGIMS and modeled by a gravity wave scheme

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          Abstract

          First high-altitude observations of gravity wave (GW)-induced CO\(_2\) density perturbations in the Martian thermosphere retrieved from NASA's NGIMS instrument on board the MAVEN satellite are presented and interpreted using the extended GW parameterization of Yi\u{g}it et al. [2008] and the Mars Climate Database as an input. Observed relative density perturbations between 180-220 km of 20-40 % demonstrate appreciable local time, latitude, and altitude variations. Modeling for the spatiotemporal conditions of the MAVEN observations suggests that GWs can directly propagate from the lower atmosphere to the thermosphere, produce appreciable dynamical effects, and likely contribute to the observed fluctuations. Modeled effects are somewhat smaller than the observed but their highly variable nature is in qualitative agreement with observations. Possible reasons for discrepancies between modeling and measurements are discussed.

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          Most cited references8

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          The Neutral Gas and Ion Mass Spectrometer on the Mars Atmosphere and Volatile Evolution Mission

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            Wavelike perturbations observed in the neutral thermosphere of Venus

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              Gravity wave propagation in a diffusively separated atmosphere with height-dependent collision frequencies

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                Author and article information

                Journal
                2015-08-12
                Article
                10.1002/2015GL065307
                1508.03095
                d1b64426-1e71-4301-b9ec-ac136c16f67f

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

                History
                Custom metadata
                Accepted for publication in Geophysical Research Letters (GRL). Special section: First Results from the MAVEN Mission to Mars
                astro-ph.EP physics.ao-ph physics.flu-dyn

                Planetary astrophysics,Thermal physics & Statistical mechanics,Atmospheric, Oceanic and Environmental physics

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