Work Description

Title: Mars Thermospheric Temperature and Density Distributions: M-GITM Simulated Datasets for Comparison to MAVEN/NGIMS Measurements Open Access Deposited

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Attribute Value
Methodology
  • Simulated neutral temperatures and densities (e.g. CO2, CO, N2, O, Ar, O2, He) and corresponding zonal, meridional and vertical neutral winds of the Mars thermosphere are calculated by the 3-D numerical model called M-GITM (Mars Global Ionosphere-Thermosphere Model), developed at the U. of Michigan. This is a climate model whose domain extends from the surface to ~250 km (Bougher et al., 2015). Neutral plus ion densities, neutral temperatures and winds are calculated on a 3-D grid (latitude, longitude, altitude) for NASA MAVEN spacecraft conditions corresponding to specific instrument measurements made. These 3-D model calculations are time-marching, making use of a finite-difference code which solves the Navier-Stokes equations for temperatures, composition, and winds. Large datacubes plus simple 1-D tables are created of M-GITM output fields for depositing on this archive.
Description
  • The NASA MAVEN (Mars Atmosphere and Volatile Evolution) spacecraft, which is currently in orbit around Mars, has been taking systematic measurements of the densities and deriving temperatures in the upper atmosphere of Mars between about 140 to 240 km above the surface since late 2014. Wind measurement campaigns are also conducted once per month for 5-10 orbits. These densities, temperatures and winds change with time (e.g. solar cycle, season, local time) and location, and sometimes fluctuate quickly. Global dust storm events are also known to significantly impact these density, temperature and wind fields in the Mars thermosphere. For the current project, the derived temperatures and O plus CO2 densities are used to characterize the upper atmosphere dayside thermal and density structure. Presently, more than 6 years of Neutral Gas and Ion Mass Spectrometer (NGIMS) measurements of neutral densities have been obtained by the MAVEN team (e.g. Mahaffy et al. 2015; Bougher et al 2015; Elrod et al., 2017; 2021; Stone et al. 2018; Gupta et al., 2021). Measured neutral density distributions are compared to simulations from a computer model of the Mars atmosphere called M-GITM (Mars Global Ionosphere-Thermosphere Model), developed at U. of Michigan. Since the global circulation plays a role in the structure, variability, and evolution of the atmosphere, understanding the processes that drive the winds in the upper atmosphere of Mars also provides the needed context for understanding density and temperature distributions and how the atmosphere behaves as a whole system. Three dimensional M-GITM simulations for extreme Mars seasonal and solar cycle conditions were conducted for detailed comparisons with NGIMS derived temperatures and O/CO2 ratio distributions (Bougher et al. 2022). Extracted model densities and temperatures along the MAVEN inbound trajectory of each orbit path (between ~300 km and periapsis) are provided in this Deep Blue Data archive. Corresponding M-GITM heat balance terms are also provided in vertical 1-D tabulated formats. README files are included for each suite of 1-D "flythru" tables, detailing the contents of each file. In addition, a general README file is provided that summarizes the inputs and outputs of the M-GITM code simulations for this study. Finally, a basic version of the M-GITM code can be found on Github at https:/github.com/dpawlows/MGITM.
Creator
Depositor
  • bougher@umich.edu
Contact information
Discipline
Funding agency
  • National Aeronautics and Space Administration (NASA)
ORSP grant number
  • PG : F031116
Keyword
Citations to related material
  • Bougher, S. W., Benna, M., Elrod, M., Roeten, K., & Thiemann, E. (2023). MAVEN/NGIMS dayside exospheric temperatures over solar cycle and seasons: Role of dayside thermal balances in regulating temperatures. Journal of Geophysical Research: Planets, 128, e2022JE007475. https://doi.org/10.1029/2022JE007475
Resource type
Last modified
  • 02/15/2023
Published
  • 08/26/2022
Language
DOI
  • https://doi.org/10.7302/4rck-ds11
License
To Cite this Work:
Bougher, S. W., Roeten, K. J. (2022). Mars Thermospheric Temperature and Density Distributions: M-GITM Simulated Datasets for Comparison to MAVEN/NGIMS Measurements [Data set], University of Michigan - Deep Blue Data. https://doi.org/10.7302/4rck-ds11

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Files (Count: 13; Size: 2.73 MB)

Thumbnailthumbnail-column Title Original Upload Last Modified File Size Access Actions
README.MGITM.GENERAL2.txt 2022-06-21 2022-06-21 7.99 KB Open Access
README.DD2E.MGITM_UATM_Extraction.txt 2022-06-16 2022-06-16 1.84 KB Open Access
DD2E.MGITM_UATM_Extraction_csv.zip 2022-06-16 2022-06-16 1.07 MB Open Access
README.DD2only.MGITM_UATM_Extraction.txt 2022-06-16 2022-06-16 1.84 KB Open Access
DD2only.MGITM_UATM_Extraction_csv.zip 2022-06-16 2022-06-16 279 KB Open Access
README.DD8.MGITM_UATM_Extraction.txt 2022-06-16 2022-06-16 1.84 KB Open Access
DD8.MGITM_UATM_Extraction_csv.zip 2022-06-16 2022-06-16 391 KB Open Access
README.PC19.MGITM_UATM_Extraction.txt 2022-06-16 2022-06-16 1.84 KB Open Access
PC19.MGITM_UATM_Extraction_csv.zip 2022-06-16 2022-06-16 1000 KB Open Access
README.DD2E.MGITM_HTBAL_Extraction.txt 2022-06-16 2022-06-16 1.66 KB Open Access
DD2E.HTBAL.LT12.LAT2p5N.150419.UT22.dat 2022-06-16 2022-06-16 3.49 KB Open Access
README.PC19.MGITM_HTBAL_Extraction.txt 2022-06-16 2022-06-16 1.65 KB Open Access
PC19.HTBAL.LT12.LAT22p5S.190923.UT4.dat 2022-06-16 2022-06-16 3.68 KB Open Access

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Date: 15-June-2022
Who: S. W. Bougher
DD2E Extraction Orbital Bundle Description: README.DD2E.MGITM_UATM_Extraction.txt
(correlated with DD2E.MGITM_UATM_Extraction_csv.zip)

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Description: Extracted model densities and temperatures along the MAVEN trajectory of each orbit between periapsis and 240 km are provided in this Deep Blue Data archive.
The DD2 Extended campaign (Orbits P1059-P1200) is targeted in this bundle. Individual orbit specific files are zipped together for this *.zip file.

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Interval Date Range Season (Ls) Narrative
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1 17-April to 13-May, 2015 328-341 DD2 (extended) sampling period


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MGITM results are presented along spacecrfat orbital trajectories making use of GEO grid (Longitude-Latitude vs Altitude):
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LST and LAT varying slowly along the orbital trajectory
ALT = ~300 km to periapsis by ~0.25 km interval

Header(10-elements):
-- Altitude (Alt)
-- Latitude (Lat)
-- Local Time (LT)
-- Mass density (Rho)
-- Temperature (T)
-- CO2 density (CO2)
-- N2 density (N2)
-- CO density (CO)
-- O density (O)
-- He density (He)

Units = Temperature (K), All neutral densities (#/m3), Mass density (kg/km3).
Altitude (km), Latitude (degrees), Local Time (hours)

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