Ongoing Theses

With increasing aperture size of telescopes, the maximum possible theoretical resolution of observations increases as well. This leads to the possibility of observing structures and phenomena, which have not been discovered yet. With the help of the solar telescope GREGOR, these observations can be...

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Standard algorithms for tracking small scale magnetic features suffer
from ambiguities due to the intrinsic complexity of the feature
interactions which are driven by photospheric convective motions.

In his Ph.D. work, Andrei Gorobets will work on an alternative concept
for tracking the evolution...

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The goal of this work is to develop a global helioseismic framework to infer the global
solar magnetic field using the perturbation of the eigenfunctions of global p modes.

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Theses

Understanding the solar meridional flow is important for uncovering the origin of the solar activity cycle. Yet, recent helioseismic estimates of this flow have come to conflicting conclusions in deeper layers of the solar interior, i.e., at depths below about 0.9 solar radii.

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For terrestrial climatology, the continuous measurement of the total (TSI) and spectral solar irradiance (SSI) between the EUV and IR spectral regions is of great importance.

Since 2008, the EUV region has been covered by the measurements of SolACES (Solar Auto Calibrating EUV Spectrometer)...

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The goal of this bachelor thesis is the study of magnetic properties of solar pores. The observation of the sunspots and pores in this thesis are done with the GREGOR telescope at the Observatorio del Teide in Teneriffe.

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Das Ziel der vorliegenden Bachelorarbeit bestand darin, die konvektive Blauverschiebung in der Photosphäre der Sonne zu untersuchen. Dazu wurde die Spektrallinie Fe I 617,333 52 nm spektroskopisch beobachtet und analysiert. Es sollte festgestellt werden, ob die Mitte-Rand-Variation dieser...

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Large-scale poloidal flow cells as formed by turbulent convection in stars are an integral part of stellar interior dynamics. Since large-scale flows reside predominantly in the deeper layers of the convection zones of stars, they are difficult to detect and characterize. Asteroseismology, the...

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Sonnenflecken sind bereits vor über 400 Jahren entdeckt worden, ihre Ursache blieb jedoch lange ungeklärt. Inzwischen weiß man dass großräumige Magnetfelder für eine geringere Oberflächentemperatur und eine, infolgedessen verringerte Strahlungsleistung verantwortlich sind. Dabei weisen die...

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Zur Bestimmung der Differentiellen Rotation im Inneren der Sonne werden in der Helioseismologie Aufspaltungskoeffizienten invertiert. Zwei verbreitete Inversions- verfahren stellen dabei RLS und SOLA dar. In dieser Bachelorarbeit sollen diese beiden Verfahren anhand der durch MDI und HMI gewonnenen...

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Context
Our Sun is an unique high-energy plasma physics laboratory, which can be studied with exceptional spatial and temporal resolution. Using dedicated telescopes, it is possible to verify and enhance our knowledge about aspects of modern physics unaccessible to any experiments on earth. State of...

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The aim of this Master research is the investigation of the evolution of the moat flow around sunspots. The behaviour of the flow, which is directed radially away from the spot, while the sunspot decays and the interaction with the surrounding network, i.e. supergranules, are analysed.

All data...

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Mit den hochauflösenden HMI-Daten konnte die differentielle Rotationsgeschwindigkeit der Sonne bestimmt und anhand von älteren Literaturwerten bestätigt werden. Die genauere Auflösung der von HMI erstellten Bilder bietet dabei einen deutlichen Vorteil gegenüber seinem Vorgänger dem MDI. Weiterhin...

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