Gastgeber: Aaron Birch

MPS Seminar: The Constant Sun: Measuring the Solar Radius and Oblateness with the Helioseismic and Magnetic Imager (R. Bush)

MPS Seminar: Probing Solar Magnetic Fields at the Base of Convection Zone (D. Chou)

MPS Seminar: Numerical simulation modelling of convection and pulsation (F. Kupka)

MPS Seminar: Imaging the Earth from sedimentary basins to the deep mantle (A. Fichtner)

MPS Seminar: Stellar Evidence of a Transitional Sun (T. Metcalfe)

MPS Seminar: The VO And Why It Matters To You (M. Demleitner)

MPS Seminar: Solar Limb Oscillations as Rotation Tracers and the Near Surface Shear (J. Kuhn)

  • Datum: 05.01.2017
  • Uhrzeit: 14:00 - 15:00
  • Vortragende(r): Jeff Kuhn
  • Institute for Astronomy, University of Hawaii, Maui, Hawaii, USA
  • Ort: MPS
  • Raum: Auditorium
  • Gastgeber: Aaron Birch
The HMI limb data pipeline is creating new information about the outer few hundred km of the solar atmosphere. The high signal to noise limb displacement and brightness oscillation data have yielded some surprising results. One of these is evidence of the largest rotation shear in the sun in the photosphere. This radial gradient is evidence of a stress that seems only possible from the radiated photon angular momentum. This seminar describes the limb oscillation data and the physical arguments that support a "photon brake" acting in the solar photosphere. [mehr]

MPS Seminar: Large eddy simulations of compressible MHD turbulence in space plasma (A. Petrosyan)

MPS Seminar: Minor planet photometric investigations: novel techniques from space and the ground (L.L. Kiss)

Here we present recent highlights from the minor planet research group of the Konkoly Observatory, all related to photometric observations of main-belt asteroids and Trans-Neptunian Objects (TNOs) with novel techniques that appeared in the last few years. First, the ecliptic survey of the NASA Kepler space telescope, known as the K2 mission, opened a whole new avenue of obtaining unbiased rotational properties of minor planets. For this, a new observing strategy had to be developed for Kepler, optimizing the data acquisition for the uninterrupted ~80 days of observations of moving objects in the fixed field of view in the ecliptic plane. Our results include statistically meaningful samples of rotational properties of main-belt asteroids, Jovian Trojan asteroids and several TNOs and Uranian small irregular moons. We also demonstrate the power of combining K2, Spitzer and HST observations for full characterization of distant icy bodies in the outer regions of the Solar System. Second, our group has actively taken part in TNO occultation observations, of which the highlight is the discovery of the rings of Haumea. For this, critical observations were made with a high-end ultrasensitive EMCCD camera, one that is capable of fast photometry of faint targets. We briefly discuss the advantages of the EMCCD technique in respect to traditional CCD photometry [mehr]
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