Seminars at MPS

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S3 Seminar: Layerings in cometary nuclei (B.-K. Ruzicka)

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S3 Seminar: Measuring Mercury´s tides (R. Thor)

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Planetary Group Seminar: The MASCOT lander onboard the Hayabusa2 mission (T.M. Ho)

MASCOT is a small asteroid lander launched on December 3rd, 2014, aboard the Japanese Hayabusa2 asteroid sample-return mission towards the 980 m diameter C-type near-Earth asteroid (NEA) 162173 Ryugu. The lander was jointly developed by the German Aerospace Centre (DLR) and the Centre National d'Etudes Spatiales (CNES). It is equipped with a sensor suite consisting of four fully-fledged instruments: a spectrometer (MicrOmega, IAS Paris), a camera (CAM, DLR Berlin), a radiometer (MARA, DLR Berlin) and a magnetometer (MAG, TU Braunschweig) to investigate Ryugu's surface structure, mineralogical composition, physical properties, thermal behavior and magnetic effects. The MASCOT lander has a total weight of only ~10kg and a size of 30 cm x 30 cm x 20 cm, comparable to a shoebox. Next to the 4 science payloads it accommodates all subsystems to guarantee the survival during the four years cold cruise phase and an on-surface operation and data uplink of up to 2 asteroid days. Upon arrival in Summer 2018 at the target, Hayabusa2 will map NEA Ryugu for several months before it will release MASCOT at an altitude of approx. 100m to free fall on the asteroid's surface. Since MASCOT has no attitude control, it will reach the surface and undergo a certain bouncing phase before it will finally come to rest. A mobility system allows the lander to upright into the correct measurement attitude and to relocate across the asteroids surface after the completion of its first science cycle. The system design, science instruments, and operational concept of MASCOT will be presented, with sidenotes on the development of the mission and its integration with Hayabusa2. [more]

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S3 Seminar: Comet formation in collapsing pebble clouds (S. Lorek)

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Planetary Group Seminar: A Multi-instrument Study of a Cometary Outburst (J. Agarwal)

Abstract: On 2016 July 3, when comet 67P was already at 3.32 AU from the sun outbound from perihelion, several instruments on board Rosetta witnessed a small outburst of activity from a point on the surface emerging from the night's shadow. The dust plume above the surface was observed by OSIRIS and Alice, and the ejected material was detected in situ by COSIMA, GIADA, ROSINA, and the Startracker camera. This talk presents a summary and synthesis of the measurements, and discusses their implications for the properties of the ejected material and the process leading to this event. [more]

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S3 Seminar: How old are red-giant stars in clusters? (N. Themeßl)

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S3 Seminar: Counter-Evershed flows in sunspots penumbrae (A. Siu)

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S3 Seminar: Stellar activity in low mass stars (E. Johnson)

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Planetary Group Seminar: Radiation Belt Modeling and Forecasts: Limitations, Challenges and Future Needs (R. Friedel)

  • Date: May 30, 2017
  • Time: 15:00 - 16:00
  • Speaker: Reiner Friedel
  • Center for Space and Earth Science (CSES) Los Alamos National Laboratory
  • Location: MPS
  • Room: Auditorium
  • Host: Urs Mall

In the scientific community, the focus of space research and model development is on understanding the underlying physics and system science of the environment in question. This often leads to a good understanding of the system, while at the same time the models in question are incapable of predicting or modeling any actual state of the system with any accuracy. Using current, state-of the art diffusion codes for the Earth’s radiation belt I will argue that our main limitation no longer lies in the models themselves but rather in the specification of their boundary conditions and other required inputs. I will further argue that in Space Weather modeling and prediction we are neither committing sufficient resources to providing these inputs, nor are we performing the required research that can effectively provide these inputs for either now-casting or forecasting needs into the future. [more]

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S3 Seminar: Multiple scattering of acoustic waves (P.-L. Poulier)

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S3 Seminar: Helioseismic holography (D. Yang)

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Planetary Group Seminar: Laboratory experiments on comet formation and activity (B. Gundlach)

  • Date: Jun 14, 2017
  • Time: 14:00 - 15:00
  • Speaker: Bastian Gundlach
  • TU Braunschweig, Institut für Geophysik und extraterrestrische Physik
  • Location: MPS
  • Room: TBA
  • Host: Urs Mall

This presentation will be providing an overview on laboratory experiments conducted at the TU Braunschweig with the aim to study comet activity and planet formation. First, an overview on recent competing comet formation scenarios is given, followed by with a discussion on how laboratory experiments can help to understand the different formation processes better. The second half of this talk will be focusing on the question of how laboratory works can be utilized to help interpreting observational data, for example gathered by the Rosetta spacecraft, to learn about comet activity. This presentation will be ending with an outlook on planned experiments and with an invitation to discuss the importance of future laboratory experiments with the audience. [more]

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S3 Seminar: Deep focusing in time-distance helioseismology (M. Pourabdian)

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S3 Seminar: Simulations of starspots (M. Panja)

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