Work Description

Title: Mars Thermospheric Responses to a Global Dust Storm (PEDE-2018): Mars Global Ionosphere-Thermosphere Model (M-GITM) Simulated Helium Distributions for Comparison to MAVEN Spacecraft Measurements Open Access Deposited

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Methodology
  • Simulated composition, temperatures and 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 are created of M-GITM outputs fields for deposit on this archive
Description
  • The NASA MAVEN (Mars Atmosphere and Volatile Evolution) spacecraft, which is currently in orbit around Mars, has been taking daily (systematic) measurements of the densities and temperatures in the upper atmosphere of Mars between about 140 to 240 km above the surface. Wind measurement campaigns are also conducted once per month for 5-10 orbits. These densities, temperatures and winds change with time (e.g. 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. Such global dust storm period measurements can be compared to simulations from a computer model of the Mars atmosphere called M-GITM (Mars Global Ionosphere-Thermosphere Model), developed at U. of Michigan. This is an ongoing detailed comparison between direct global dust storm period measurements in the upper atmosphere of Mars and simulated MGITM fields and is important because it can help to inform us what physical processes are acting on the upper atmosphere during such large dust events. 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 key context for understanding how the atmosphere behaves as a whole system. A basic version of the M-GITM code can be found on Github as follows: https:/github.com/dpawlows/MGITM [less] About 4 months of Neutral Gas and Ion Mass Spectrometer (NGIMS) measurements of densities and winds have been made by the MAVEN team during the summer of 2018 (Elrod et al., 2019; Roeten et al 2022). For this specialized archive (Elrod et al. 2023), one reference measurement interval during this 2018 global dust storm (30-31 August 2018) is selected for detailed study of helium distributions (Elrod et al. 2023). The Mars conditions for this last of nine intervals have been used to launch corresponding M-GITM code simulations, yielding 3-D neutral density, temperature and wind fields for comparison to these NGIMS measurements. This last interval is used to provide M-GITM datacubes to explicitly extract the helium density (plus corresponding temperatures and neutral winds) along the trajectory of each orbit path between 140 and 240 km . A general README file is also provided for this Deep Blue Data archive detailing the contents of each file, while also summarizing the inputs and outputs of the M-GITM code simulations for this study.
Creator
Depositor
  • bougher@umich.edu
Contact information
Discipline
Funding agency
  • National Aeronautics and Space Administration (NASA)
ORSP grant number
  • PGN: F031116
Keyword
Citations to related material
  • Elrod, M. K., S. W. Bougher, K. Roeten, R. Sharrar, J. Murphy, Structural and Compositional Changes in the Upper Atmosphere related to the PEDE-2018 Dust Event on Mars as Observed by MAVEN NGIMS, Geophys. Res. Lett., (2019). doi: 10.1029/2019GL084378.
  • Elrod, M. K., S. W. Bougher, K. Roeten and K. Arnold, Surprising Decrease in the Martian He Bulge during PEDE-2018 and Changes in Upper Atmospheric Circulation, J. Geophysical Research, (2023), doi:XXX
Resource type
Last modified
  • 12/23/2022
Published
  • 12/23/2022
Language
DOI
  • https://doi.org/10.7302/cyb9-pe07
License
To Cite this Work:
Bougher, S. W., Roeten, K. J. (2022). Mars Thermospheric Responses to a Global Dust Storm (PEDE-2018): Mars Global Ionosphere-Thermosphere Model (M-GITM) Simulated Helium Distributions for Comparison to MAVEN Spacecraft Measurements [Data set], University of Michigan - Deep Blue Data. https://doi.org/10.7302/cyb9-pe07

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Files (Count: 5; Size: 102 MB)

Thumbnailthumbnail-column Title Original Upload Last Modified File Size Access Actions
README.MGITM.GENERAL.txt 2022-12-23 2022-12-23 5.44 KB Open Access
PEDE4B.NOGW.E20.180830.UT19.user...c.dat 2022-12-20 2022-12-20 32.5 MB Open Access
PEDE4B.NOGW.E20.180830.UT19.user...c.sav 2022-12-20 2022-12-20 18.6 MB Open Access
PEDE4D.YSGW.E20.180830.UT19.user...c.dat 2022-12-20 2022-12-20 32.5 MB Open Access
PEDE4D.YSGW.E20.180830.UT19.user...c.sav 2022-12-20 2022-12-20 18.6 MB Open Access

***************************************************************************************

Date: 23-December-2022
Who: S. W. Bougher
General Details of MGITM datasets for PEDE Dust Event in Summer 2018

*****************************************************************************************

PEDE Dust Storm Campaigns (see Elrod et al., 2019; Roeten et al. 2022a; Elrod et al. 2023)
--------------------------------------------------------------------------------------------
Interval Date (2018) Season (Ls) Periapsis Latitude Periapsis TLST Narrative
(DEG) (Hours)
--------------------------------------------------------------------------------------------

1 June 1 185.2 27.0S 8.8 Onset of Storm
2 June 8 189.2 19.0S 7.8 1st UATM Detection
3 June 12 191.6 16.0S 7.4 Growth Phase
4 June 16 194.0 13.0S 7.1 Growth Phase
5 June 20 196.0 10.0S 6.6 PEDE Declared
6 June 27 200.4 5.0S 6.0 Periapsis to Nightside
7 July 7-10 207-208 4.0N 5.0 Peak of PEDE
8 August 15 230.5 27.0N 2.0 Early Decay Phase
9 August 30 240.6 45.0N 23.0 Mid Decay Phase**

** This archive
*****************************************************************************************

MGITM Results are presented on a regular GEO grid (Longitude-Latitude-Altitude):
-------------------------------------------------------------------------
LON (72 elements) = 2.5 to 357.5 by 5.0 degree interval (fastest index)
LAT (36 elements) = -87.5 to +87.5 by 5.0 degree interval
ALT (46 elements) = 98.75 to 226.25 km by 2.5 km interval (slowest index)

where

LON (2.5 to 180 to 357.5E) corresponds to SLT = 12 to 24 to 12
(We have selected the proper UT for each dataset for this match)

Fields (18):
-- Temperatures : Tn, Ti, Te
(neutral, ion, electron)
-- Major neutral densites : [CO2], [O], [N2], [CO], [Ar], [He]
-- Major plasma densities : [O2+], [O+], [CO2+], [Ne]
(dayside only, best in PCE region below ~200 km)
-- 3-component neutral winds: Un, Vn, Wn
-- Pressure (total) : P
-- Solar Zenith Angle : SZA

Units = All Temperatures (K), All densities (#/m3), 3-component winds (m/s),
Pressure (pascals), SZA (degrees)

File Nomenclature:
------------------------------
PEDE4B.ZZGW.E20.YYMMDD.utXX.userdetic.dat (PEDE4B contains an M-GITM simulation with
no gravity wave forcing)
or

PEDE4D.ZZGW.E20.YYMMDD.utXX.userdetic.dat (PEDE4D contains an M-GITM simulation with
gravity wave forcing included)

ZZ = Flag for yes/no for M-GITM GW formulation activation
YY = last 2-digits of year
MM = 2-digit month
DD = 2-digit day of month
XX = Universal Time (on Earth): 2-digit integral hours
MonthYear = PEDE Interval

e.g. PEDE4D.YSGW.E20.180830.ut19.userdetic.dat
ZZ = YS (GW formulation turned on)
YY = 18
MM = 08
DD = 30
XX = 19

5-Files in the respository for downloading:
----------------------------------------------------------------------------------
README.MGITM.GENERAL2.txt

PEDE4B.NOGW.E20.180830.ut19.userdetic.dat

PEDE4B.NOGW.E20.180830.ut19.userdetic.sav

PEDE4D.YSGW.E20.180830.ut19.userdetic.dat

PEDE4D.YSGW.E20.180830.ut19.userdetic.sav

where:

*.dat files are ascii formatted datacubes for wide usage

*.sav files are IDL formmatted save files for IDL users

FISM-Mars daily averaged solar EUV-UV fluxes (1-195 nm) used based upon MAVEN
Extreme Ultraviolet Monitor (EUVM) instrument: Thiemann et al. (2017).
-------------------------------------------------------------------------------------
Level 3 EUVM daily products used: v11_r04 (all PEDE intervals)

*****************************************************************************************

Specific Key References pertaining to MGITM Simulations plus MAVEN NGIMS Datasets:
--------------------------------------------------------------------------------------
Bougher et al. (2015), J. Geophys. Res., 120, 311-342. doi:10.1002/2014JE004715
Bougher et al. (2017), J. Geophys. Res., 122, 1296-1313. doi:10.1002/2016JA023454
Bougher et al. (2022), J. Geophys. Res., 127, XXXX-XXXX. doi:10.1002/2022JE007475
Elrod et al. (2017), J. Geophys. Res., 122, 2564-2573. doi:10.1002/2016JA023482
Elrod et al. (2019), Geophys. Res. Lett., 47. doi:10.1029/2019GL084378
Roeten et al. (2019), J. Geophys. Res., 124, 3283-3303. doi:10.1029/2019JE005957
Roeten et al. (2022a), Icarus, 382. doi:10.1016/j.icarus.2022.115006
Roeten et al. (2022b), J. Geophys. Res., 127, XXXX-XXXX. doi:10.1029/2022JE007477
Thiemann et al. (2017), J. Geophys. Res., 122, 2748-2767. doi:10.1002/2016JA023512

Citation for this dataset:
-------------------------
Bougher, S. W., Roeten, K. J. (2022) Mars Thermospheric Responses to a Global Dust Storm (PEDE-2018):
Mars Global Ionosphere-Thermosphere Model (M-GITM) Simulated Helium Distributions for Comparison
to MAVEN Spacecraft Measurements [Data set], University of Michigan - Deep Blue Data.
doi: https://doi.org/10.7302/cyb9-pe07.

*****************************************************************************************

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