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Now showing items 1-15 of 15

    • Investigations of the solar dynamo within the framework of the Babcock-Leighton mechanism 

      Cloutier, Simon (2024-06-13)
      Sunspots are dark blemishes on the surface of the Sun whose number waxes and wanes over the course of approximately eleven years. This solar cycle is believed to be powered by a hydromagnetic dynamo, whereby the interaction ...
    • Theory of solar oscillations in the inertial frequency range 

      Bekki, Yuto (2022-11-16)
      Recent observations have revealed that we lack a fundamental understanding of the large scale (with spherical harmonic degrees $l < 60$) flows in the Sun. Flows at these large scales are strongly influenced by rotation. ...
    • Solar surface flows during active region emergence 

      Gottschling, Nils (2022-06-16)
      The aim of this thesis is to improve our understanding of the emergence of magnetic flux in the form of active regions (ARs) to the solar surface. Active regions are concentrations of strong magnetic field at the surface ...
    • Helioseismic diagnostics of solar dynamics in the near-surface layers 

      Poulier, Paul-Louis (2022-02-08)
      This thesis proposes to develop new helioseismic diagnostics of solar near-surface flows. In a first part, we discuss the interaction of solar seismic waves (sound waves) with small-scale turbulent convection. The treatment ...
    • Observations of large-scale solar flows 

      Proxauf, Bastian (2021-04-13)
      In this dissertation, several components of large-scale solar flows are studied observationally: solar equatorial Rossby waves (waves of radial vorticity), large-scale convection, and surface flows around active regions. ...
    • Inverse Problems in Local Helioseismology 

      Pourabdian, Majid (2020-08-04)
      Helioseismology is the main tool to infer the physical properties in the solar interior. In time-distance helioseismology, measurements of wave travel times are extracted from the cross-correlation of the oscillation signal ...
    • On the Detection of Exomoons in Photometric Time Series 

      Rodenbeck, Kai Oliver (2019-09-02)
      One of the next big steps forward for exoplanet science would be the detection of moons around extrasolar planets. In this thesis I investigate the exomoon candidate around the exoplanet Kepler-1625 b. I estimate the ...
    • Brightness Contrast of Solar Magnetic Elements Observed by Sunrise 

      Kahil, Fatima (2019-06-13)
      The irradiance of the Sun is modulated on all time scales. Small-scale solar magnetic elements composed of quiet-Sun network and active region plages contribute to this modulation on solar cycle time scales. The evaluation ...
    • Modeling experiments in helioseismic holography 

      Yang, Dan (2019-05-29)
      This dissertation aims at developing a theoretical framework for the signal and noise in helioseismic holography which is mathematically rigorous and physically meaningful. A main focus of this dissertation is modeling the ...
    • Studies of the radial gradient of rotation near the solar surface 

      Barekat, Atefeh (2018-02-16)
      Continuous observations of solar oscillations over the last twenty years have provided an opportunity to investigate interior properties of the Sun and their variations over the last two solar cycles. In this thesis, I ...
    • Differential rotation in Sun-like stars from surface variability and asteroseismology 

      Nielsen, Martin Bo (2016-07-15)
      Thanks to helioseismology we know the internal rotation of the Sun as a function of radius and latitude. The presence of a shear at the base of the solar convection zone is thought to play a key role in the generation of ...
    • Simulating the signature of starspots in stellar oscillations 

      Papini, Emanuele (2016-04-14)
      It has been known for a few decades that acoustic oscillations are affected by stellar activity. In the case of the Sun global acoustic modes show a variation with the 11-year cycle and a similar phenomenon has been observed ...
    • Data Compression for Helioseismology 

      Löptien, Björn (2015-10-22)
      Efficient data compression will play an important role for several upcoming and planned space missions involving helioseismology, such as Solar Orbiter. Solar Orbiter, to be launched in October 2018, will be the next ...
    • Measuring vortical flows in the solar interior 

      Langfellner, Jan (2015-09-28)
      This thesis focuses on observations of the effects of rotation on solar convection at the length scales of supergranulation and larger (>30 Mm). Rotation drives vortical flows through the Coriolis force and causes anisotropic ...
    • Analysis of time series of solar-like oscillations - Applications to the Sun and HD52265 

      Stahn, Thorsten (2011-08-25)
      The study of stellar oscillations allows one to constrain the structure and dynamics of stellar interiors to a precision that cannot be achieved with other methods. This dissertation focusses ...