A5055676761- Planetary Science and Exploration
- Astro and Planetary Science
- Spacecraft and Cryogenic Technologies
- Cryospheric studies and observations
- Scientific Research and Discoveries
- Space Exploration and Technology
- Spaceflight effects on biology
- Methane Hydrates and Related Phenomena
- Surfactants and Colloidal Systems
- Astrophysics and Star Formation Studies
- Spacecraft Design and Technology
- Space Science and Extraterrestrial Life
- Nuclear Physics and Applications
- Thermodynamic properties of mixtures
- Arctic and Antarctic ice dynamics
- Physics and Engineering Research Articles
- Earth Systems and Cosmic Evolution
- Aerospace Engineering and Energy Systems
- Icing and De-icing Technologies
- Chemical and Physical Properties in Aqueous Solutions
- Chemical Thermodynamics and Molecular Structure
- Tunneling and Rock Mechanics
- Geological Formations and Processes Exploration
- Fusion and Plasma Physics Studies
- Advanced Sensor Technologies Research
Luleå University of Technology
2022-2024
Space Research Institute
2004-2021
Austrian Academy of Sciences
2004-2021
University of Stirling
2018-2021
The Open University
2015-2018
Thermal and mechanical material properties determine comet evolution even solar system formation because comets are considered remnant volatile-rich planetesimals. Using data from the Multipurpose Sensors for Surface Sub-Surface Science (MUPUS) instrument package gathered at Philae landing site Abydos on 67P/Churyumov-Gerasimenko, we found diurnal temperature to vary between 90 130 K. The surface emissivity was 0.97, local thermal inertia 85 ± 35 J m(-2) K(-1)s(-1/2). MUPUS probe did not...
We report on thermal conductivity measurements performed glass spheres of different grain sizes under varying pressure conditions ranging from 10 −5 up to 1000 hPa. Glass 0.1 4.3 mm were used as an analogue for the coarse‐grained fractions planetary regolith. From obtained versus data, sample pore derived and compared estimated sizes. An increasing difference between size with was found. The behavior granular matter decreasing analyzed by estimating Knudsen number given system. results...
The thermo-mechanical properties of planetary surface and subsurface layers control to a high extent in which way body interacts with its environment, particular how it responds solar irradiation potentially existing atmosphere. Furthermore, if the natural temperature profile over certain depth can be measured situ, this gives important information about heat flux from interior thus thermal evolution body. Therefore, most recent planned lander missions experiment packages for determining are...
From the operation of MUPUS thermal probe Spohn et al. (2015) concluded that material nucleus 67P/Churyumov–Gerasimenko is likely to have a high strength, at least locally Philae landing site. In this work we consider derived strength in order constrain its granulation. For purpose performed numerical simulations long-term sintering ice–dust granular mixtures different granulation, covered by dust mantle. The mantle has thickness 0–16 cm, and (pore size temperature-dependent) conductivity....
Mars’ polar caps are – depending on hemisphere and season - partially or totally covered with CO2 ice. Icy surfaces such as the of Mars behave differently from rock soil when they irradiated by solar light. The latter absorb reflect incoming radiation within a thin layer beneath surface. In contrast, ices transparent in visible spectral range opaque infrared. Due to this fact, can penetrate certain depth raise temperature ice dust below This may play an important role energy balance icy...
The CoPhyLab (Cometary Physics Laboratory) project is designed to study the physics of comets through a series earth-based experiments. For these experiments, dust analogue was created with physical properties comparable those non-volatile found on comets. This "CoPhyLab dust" planned be mixed water and CO$_2$ ice placed under cometary conditions in vacuum chambers processes taking place nuclei In order develop this analogue, we two components representative for materials present nuclei. We...
Abstract Although ice fracturing and deformation is key to understanding some of the landforms encountered in high‐latitude regions on Mars other icy bodies solar system, little known about mechanical characteristics CO ice. We have measured hardness solid directly laboratory with a Leeb tester calculated corresponding yield strength. also water by same method, confirming previous work. Our results indicate that slightly weaker, ranging between 200 400 ( 10 30 MPa strength, assuming only...
Our interpretation of the data returned by Rosetta and other cometary missions is based on predictions theoretical models results laboratory experiments. For example, Kossacki et al. (2015) showed that 67P's surface hardness reported Spohn can be explained sintering. The present work supports Rosetta's observations investigating hardening process near-surface layers change in morphology during insolation. In order to create as simple an analogue possible our sample consists pure, porous H2O...
Abstract Icy surfaces behave differently to rocky or regolith‐covered in response irradiation. A key factor is the ability of visible light penetrate partially into subsurface. This results solid‐state greenhouse effect, as ices can be transparent translucent and shorter wavelengths, while opaque infrared. lead significant differences shallow subsurface temperature profiles when compared surfaces. Of particular significance for modeling effect e ‐folding scale, otherwise known absorption...
The Comet Physics Laboratory (CoPhyLab) is an international research program to study the physical properties of cometary analog materials under simulated space conditions. project dedicated studying, with help multiple instruments and different expertise background from partners, physics comets, including processes inside nuclei, activity leading ejection dust gas, sub-surface surface evolution nuclei when exposed solar illumination. CoPhyLab will provide essential information on formation...
Abstract The penetration depth of broad spectrum solar irradiation over the wavelength range 300–1,100 nm has been experimentally measured for water and carbon dioxide ices different grain size ranges. Both these ice compositions are found on surface Mars have observed as frosts, snow deposits, sheets. e ‐folding scale slab previously measured, but understanding behavior between end‐member states is important modeling thermal processes associated with deposits Mars, such growth formation via...
Abstract The depth to which solar radiation can penetrate through ice is an important factor in understanding surface‐atmosphere interactions for icy planetary surfaces. Mars hosts both water and carbon dioxide on the surface subsurface. At high latitudes during autumn winter condenses form seasonal polar cap. This has been modeled observed to, part, occur as snowfall. As snow accumulates, thermal properties of are changed, whether underlying was rocky, regolith, or a solid sheet. results...
Martian araneiform terrain, located in the Southern polar regions, consists of features with central pits and radial troughs which are thought to be associated solid state greenhouse effect under a CO$_{2}$ ice sheet. Sublimation at base this leads gas buildup, fracturing flow entrained regolith out vents onto surface. There two possible pathways for gas: through gap between slab underlying regolith, as proposed by Kieffer et al (2007), or pores permeable layer, would imply that properties...
We performed the first laboratory study on formation of molards by sublimation processes. On Earth, permafrost are cones loose debris in landslide deposits that can be used as a marker for mountain retreat (Morino et al., EPSL 2019). They originate from ice-cemented blocks sediment transported downslope within and melt to form conical mounds over time. Molard candidates have also been found Mars ejecta flows one billion-year-old Hale Crater. These show similar morphology spatial distribution...
Thermal fatigue is produced by diurnal and/or annual variations of the surface temperature on asteroids and its efficiency depends heliocentric distance, rotation period, thermal inertia asteroid’s surface. A fundamental assumption previous studies [1,2], that remains effective over thousands, or even millions, cycles. However, Kaiser effect, extensively studied in field fracture mechanics terrestrial rocks, states fracturing materials ceases when previously exerted load levels are...
Thermal fatigue is one of the processes governing regolith generation on asteroids and planetary surfaces. Although meteorites have been extensively studied to date, information surface changes triggered by thermal cycling slow rotators limited. occurs because (a) mechanical stresses caused differential expansion, itself different degrees heating (b) expansion coefficients mineral grains within a rock. The underlying assumption for effectiveness that number cycles increases total action,...