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Near Surface Properties of Martian Regolith Derived From InSight HP3-RAD Temperature Observations During Phobos Transits

Mueller, N. and Piqueux, S. and Lemmon, M. T. and Maki, J. and Lorenz, R. D. and Grott, M. and Spohn, T. and Smrekar, S. and Knollenberg, J. and Hudson, T.L. and Krause, C. and Millour, E. and Forget, F. and Golombek, M. and Hagermann, A. and Attree, N. and Siegler, M.A. and Banerdt, W.B. (2021) Near Surface Properties of Martian Regolith Derived From InSight HP3-RAD Temperature Observations During Phobos Transits. Geophysical Research Letters, 48 (15), e2021GL093542. Wiley. doi: 10.1029/2021GL093542. ISSN 0094-8276.

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Official URL: https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2021GL093542

Abstract

Abstract We use the Martian surface temperature response to Phobos transits observed next to the InSight lander in Elysium Planitia to constrain the thermal properties of the uppermost layer of regolith. Modeled transit lightcurves validated by solar panel current measurements are used to modify the boundary conditions of a 1D heat conduction model. We test several model parameter sets, varying the thickness and thermal conductivity of the top layer to explore the range of parameters that match the observed temperature response within its uncertainty both during the eclipse as well as the full diurnal cycle. The measurements indicate a thermal inertia (TI) of 103 Jm^(-2)K^(-1)s^(-1/2) in the uppermost layer of 0.2-4 mm, significantly smaller than the TI of 200 Jm^(-2)K^(-1)s^(-1/2) derived from the diurnal temperature curve. This could be explained by larger particles, higher density, or some or slightly higher amount of cementation in the lower layers.

Item URL in elib:https://elib.dlr.de/143481/
Document Type:Article
Additional Information:e2021GL093542 2021GL093542
Title:Near Surface Properties of Martian Regolith Derived From InSight HP3-RAD Temperature Observations During Phobos Transits
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Mueller, N.nils.mueller (at) dlr.dehttps://orcid.org/0000-0001-9229-8921
Piqueux, S.Jet Propulsion Laboratory, California Institute of Technology (Pasadena, CA, 91109)UNSPECIFIED
Lemmon, M. T.Space Science Institute, College Station, Texas, USAUNSPECIFIED
Maki, J.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USAUNSPECIFIED
Lorenz, R. D.Johns Hopkins University, Applied Physics Lab., Laurel, MD 20723, USAUNSPECIFIED
Grott, M.matthias.grott (at) dlr.dehttps://orcid.org/0000-0002-8613-7096
Spohn, T.Tilman.Spohn (at) dlr.dehttps://orcid.org/0000-0002-9322-6660
Smrekar, S.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USAUNSPECIFIED
Knollenberg, J.joerg.knollenberg (at) dlr.deUNSPECIFIED
Hudson, T.L.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USAUNSPECIFIED
Krause, C.Christian.Krause (at) dlr.deUNSPECIFIED
Millour, E.Laboratoire de Météorologie Dynamique (LMD/IPSL), Sorbonne Université, Centre National de la Recherche Scientifique, École Polytechnique, École Normale Supérieure, Paris, FranceUNSPECIFIED
Forget, F.Laboratoire de Météorologie Dynamique (LMD/IPSL), Sorbonne Université, Centre National de la Recherche Scientifique, École Polytechnique, École Normale Supérieure, Paris, FranceUNSPECIFIED
Golombek, M.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USAhttps://orcid.org/0000-0002-1928-2293
Hagermann, A.Lulea University of Technology, KirunaUNSPECIFIED
Attree, N.Earth and Planetary Observation Centre, Faculty of Natural Sciences, University of Stirling, UKUNSPECIFIED
Siegler, M.A.Southern Methodist University, Dallas, Texas, USAUNSPECIFIED
Banerdt, W.B.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USAUNSPECIFIED
Date:26 July 2021
Journal or Publication Title:Geophysical Research Letters
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:48
DOI :10.1029/2021GL093542
Page Range:e2021GL093542
Publisher:Wiley
ISSN:0094-8276
Status:Published
Keywords:phobos transit, thermal inertia, thermal conductivity
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project InSight - HP3
Location: Berlin-Adlershof , Köln-Porz
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Space Operations and Astronaut Training > User center for space experiments (MUSC)
Deposited By: Müller, Nils
Deposited On:13 Aug 2021 09:02
Last Modified:13 Aug 2021 09:02

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