1 / 9

Planetary Surfaces

Planetary Surfaces. Main task Understanding the physics of planetary near-surface layers, including comets, Mars & Moon Main research topics Study of the mechanisms controlling the “activity” of comets by theoretical modelling as well as experimental simulation in a cryo -vacuum environment

Download Presentation

Planetary Surfaces

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Planetary Surfaces • Main task • Understanding the physics of planetary near-surface layers, including comets, Mars & Moon • Main research topics • Study of the mechanisms controlling the “activity” of comets by theoretical modelling as well as experimental simulation in a cryo-vacuum environment • Development of prototypes for surface in situ measurements of key parameters (thermal conductivity, electrical permittivity, mechanical properties) • Participation in ESA comet mission Rosetta/Philae and NASA Mars mission InSight • Refereed publications (since Jan 2013): • Total: 4 (first author: 4) • Educational activities (since Jan 2013): • Diploma theses: 3 • Lecturing at University of Graz IWF/ÖAW

  2. Who are we? • Lead:Norbert Kömle • Members • Staff: M. Bentley, G. Kargl, W. Macher • Master Students:B. Krebl (thesis completed), A. Schaffer, P. Tiefenbacher • Cooperation within IWF • MIDAS Group: Cometary dust • Key international collaboration Germany: Institut für Planetenerkundung, DLR BerlinPoland: Space Research Centre, Polish Academy of Sciences, WarsawUK: Planetary Research Institute, Open University, Milton Keynes IWF/ÖAW

  3. MIDAS Operations and Science • MIDAS is an amplitude modulated Atomic Force Microscope • Dust particles are collected, located, and imaged • Data are nm-resolution 3D images (height fields) • Full-time operations start early May

  4. Modeling of Cometary Crevasses • Pressure distribution near the exit • of an elongated ice filled crack • Surface erosion causing deepening of the crystallization front • Surface ice sublimation • Dynamics of phase changes • Downward motion of crystallization front • Amorphous ice crystallization? Krebl B. and Kömle N.I.: A two-dimensional model of crevasses formed by cometary activity. Planet. Space Sci.,87, 46-65 (2013). IWF/ÖAW

  5. Robust Thermal Conductivity Probes • Perform tests and calibration experiments in different materials • Multiple probes (2 or 4 needles) to derive thermal properties heaterneedle sensor needle Dualprobes IWF/ÖAW

  6. Novel Thermal Dual Probe Theory • Geometry: two parallel cylinders A and B • Each cylinder is composed of a core and an enclosing coaxial sheath • Surface resistances taken into accountat core/sheath and sheath/sample interface Advantages of analytic approach • Fast computation; high accuracy • Applicability to fitting of measurement data • Measurement scenario • Pulse heating of A, observation of TA(t), TB(t) • heat capacity and conductivity of sample,surface resistance at probe/sample boundary • Macher W., Kömle N.I., Bentley M.S., Kargl G.: Temperature evolution of two parallel composite cylinders with contact resistances and application to thermal dual-probes, Int. J. HeatandMass Transfer, 69, 481-492 (2014). IWF/ÖAW

  7. Pile Driving Models for Soil Penetration • Determination of soil-mechanical properties: • Configuration for Philae/MUPUS hammering device • Configuration for InSight Mole • Scaling of standard models • Pile driving model adapted to the „mole“ configuration: • Hollow tube driven by the impact of an interior ram weight IWF/ÖAW

  8. Future Plans: 2015-2018 • Rosetta data interpretation after Philae arrival, with emphasis on MIDAS and MUPUS • Development of models to integrate MIDAS and MUPUS data into a local (thermal) surface model • Soil-mechanical modelling for the Mars mission InSight evaluation of soil-mechanical parameters from performance data of the InSight mole IWF/ÖAW

  9. Thank you IWF/ÖAW

More Related