MAVEN/NGIMS Thermospheric Neutral Wind Observations: Interpretation Using the M-GITM General Circulation Model

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dc.contributor.authorRoeten, Kali J.
dc.contributor.authorBougher, Stephen W.
dc.contributor.authorBenna, Mehdi
dc.contributor.authorMahaffy, Paul R.
dc.contributor.authorLee, Yuni
dc.contributor.authorPawlowski, Dave
dc.contributor.authorGonzález‐Galindo, Francisco
dc.contributor.authorLópez‐Valverde, Miguel Ángel
dc.date.accessioned2020-02-03T16:37:28Z
dc.date.available2020-02-03T16:37:28Z
dc.date.issued2019-12-12
dc.description.abstractUsing a new observational technique, the NGIMS (Neutral Gas and Ion Mass Spectrometer) instrument on the MAVEN (Mars Atmosphere and Volatile Evolution) spacecraft has the unique capability to measure horizontal thermospheric winds. Measured along the orbit track from periapsis (∼150 km) to ∼200 km, these are the first in situ observations of thermospheric winds at Mars. Significantly, this also means that simulated winds from a global circulation model can be compared to in situ observations from this part of the Martian atmosphere for the first time. In this study, observations from five NGIMS neutral wind campaigns have been compared to simulations from the Mars Global Ionosphere‐Thermosphere Model (M‐GITM), a ground to exosphere 3‐D general circulation model. By comparing NGIMS neutral wind observations to model simulations, the processes driving the winds and their variations in the upper atmosphere are examined. These comparisons show that for certain observational periods, the M‐GITM simulated winds can generally replicate the magnitude and/or direction of the NGIMS wind observations, while in others, significant differences occur. In general, wind observations from NGIMS campaigns with large orbit‐to‐orbit variability are not well replicated by M‐GITM, while campaigns with higher observed wind speeds are better captured by the model. Additionally, using these data‐model comparisons, the relative role of normal solar forcing and corresponding differential heating in driving thermospheric winds at Mars is found to be variable, likely acting as the primary driver under some conditions and secondary to other physical processes under others.en_US
dc.description.sponsorshipFunding support for this research was provided by the MAVEN project, Grant NNH10CC04C. This work was also supported by NASA Headquarters under the NASA Earth and Space Science Fellowship Program - Grant 80NSSC18K1238. Funding for F.González-Galindo and M. Á.López-Valverde was provided by the Spanish National Research Council under intramural project CSIC 201450E022. NGIMS data sets used in this paper are available on the Planetary Data System (http://pds-atmospheres.nmsu.edu/data_and_services/atmospheres_data/MAVEN/ngims.html) as well as EUV data sets (https://pds-ppi.igpp.ucla.edu/search/view/?f=yes&id=pds://PPI/maven.euv.modelled). Data cubes containing M-GITM simulations used in this paper can be found on the University of Michigan Deep Blue repository (http://doi.org/10.7302/85qt-e980).en_US
dc.description.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2019JE005957en_US
dc.format.extent21 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2pndu-fkdi
dc.identifier.citationRoeten, Kali J.; Bougher, Stephen W.; Benna, Mehdi; Mahaffy, Paul R.; Lee, Yuni; Pawlowski, Dave; González‐Galindo, Francisco; López‐Valverde, Miguel Ángel; MAVEN/NGIMS Thermospheric Neutral WindObservations: Interpretation Using theM-GITM General Circulation Model; JGR Planets 124,12 ; 3283-3303 (2019); https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2019JE005957en_US
dc.identifier.urihttps://doi.org/10.1029/2019JE005957
dc.identifier.urihttp://hdl.handle.net/11603/17212
dc.language.isoen_USen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Center for Space Sciences and Technology
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.rightsPublic Domain Mark 1.0*
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleMAVEN/NGIMS Thermospheric Neutral Wind Observations: Interpretation Using the M-GITM General Circulation Modelen_US
dc.typeTexten_US

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