Near Surface Properties of Martian Regolith Derived From InSight HP3-RAD Temperature Observations During Phobos Transits
| العنوان: | Near Surface Properties of Martian Regolith Derived From InSight HP3-RAD Temperature Observations During Phobos Transits |
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| المؤلفون: | Christian Krause, Justin N. Maki, François Forget, Ehouarn Millour, Sue Smrekar, Matthew A. Siegler, Nils Mueller, Sylvain Piqueux, William B. Banerdt, T. Spohn, Troy L. Hudson, Ralph D. Lorenz, Nicholas Attree, Mark T. Lemmon, Matthias Grott, Matthew P. Golombek, A. Hagermann, Jörg Knollenberg |
| المساهمون: | DLR Institute of Planetary Research, German Aerospace Center (DLR), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), Space Science Institute [Boulder] (SSI), Johns Hopkins University Applied Physics Laboratory [Laurel, MD] (APL), International Space Science Institute [Bern] (ISSI), Laboratoire de Météorologie Dynamique (UMR 8539) (LMD), Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Luleå University of Technology (LUT), University of Stirling, Huffington Department of Earth Sciences [SMU Dallas], Southern Methodist University (SMU) |
| المصدر: | Geophysical Research Letters Geophysical Research Letters, American Geophysical Union, 2021, 48 (15), ⟨10.1029/2021GL093542⟩ |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Martian, Materials science, phobos transit, 010504 meteorology & atmospheric sciences, Diurnal temperature variation, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, Thermal conduction, thermal inertia, 01 natural sciences, Regolith, Computational physics, Geophysics, Thermal conductivity, 13. Climate action, Diurnal cycle, Martian surface, 0103 physical sciences, Thermal, General Earth and Planetary Sciences, thermal conductivity, 010303 astronomy & astrophysics, 0105 earth and related environmental sciences |
| الوصف: | International audience; AbstractWe 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 urn:x-wiley:00948276:media:grl62794:grl62794-math-0002 in the uppermost layer of 0.2–4 mm, significantly smaller than the TI of urn:x-wiley:00948276:media:grl62794:grl62794-math-0003 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.Plain Language SummaryThe Mars moon Phobos passed in front of the Sun from the perspective of the InSight lander on several occasions. The Mars surface temperatures measured by the lander became slightly colder during these transits due to the lower amount of sunlight the surface received at this time. The transits only last 20–35 s and therefore only the very top layer, about 0.3–0.8 mm, of the ground has time to cool significantly. The top layer cools and heats up faster than we expected based on the temperature changes of the day-night cycle, which affects about 4 cm of the ground. Based on this observation we conclude that the material in the top mm of the ground is different from that below. A possible explanation would be an increase of density with depth, a larger fraction of smaller particles such as dust at the top, or a layer where particles are slightly cemented together beginning at 0.2–4 mm below the surface. |
| اللغة: | English |
| تدمد: | 0094-8276 1944-8007 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::866a2f86f45649a5be0225afb19e7657 https://elib.dlr.de/143481/ |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....866a2f86f45649a5be0225afb19e7657 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 00948276 19448007 |
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