KIS Astrophysical Colloquium 2020

The colloquium usually takes place on Thursdays at 11:30 if not stated otherwise.

Upcoming Talks:
postponed Mariarita Murabito, INAF - Osservatorio Astronomico di Roma, Italy: 3D magnetic structure and brightening in a sunspot penumbra
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postponed Adalbert Ding, Technische Universität Berlin:
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postponed Festkolloquium zu Ehren von Hubertus Wöhl und Helmold Schleicher:
Festredner: Arnold Hanslmeier, Universität Graz
Past Talks:
January 16 Oskar von der Lühe: On the Nobel-Prizes in Physics 2019
February 20 Marc Schumann, Physikalisches Institut, Universität Freiburg: Exploring the Dark Universe with XENON
There is overwhelming indirect evidence from astrophysics and cosmology that about 95% of the universe is dark. More than 25%, outnumbering ordinary matter by a factor of five, is made up by dark matter which builds large-scale structures. However, the dark matter particle, maybe realized as a Weakly Interacting Massive Particle (WIMP), remains unknown as of today. The search for WIMP dark matter with terrestrial detectors is currently led by the ultra-sensitive XENON1T detector which uses liquid xenon as a target. The experiment was built with strong contributions from Freiburg and is currently being upgraded to improve the sensitivity even further. I will review the principles of direct WIMP searches, present the current status of the field and will show how we plan to cover the entire experimentally accessible WIMP parameter space in the next decades.
February 27 Aneta Wisniewska, Universität Krakau, Polen: High-frequency oscillations during a solar flare
Despite many investigations of flares in the solar corona and the middle chromosphere, their effect on the background solar oscillations are still not well explained. We present a study of multi-wavelength observations, of a C 2.3 solar flare in Active Region NOAA 12353, observed on 2015 May 23, which reveal new properties of acoustic waves in the flaring region. The ground-based data were measured by the HELioseismological Large Regions Interferometric Device, operating at the Vacuum Tower Telescope.