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Now showing items 1-20 of 28

    • Modeling spectral and total solar irradiance variability from any vantage point in the Solar System 

      de Oliveira Martins, Isabela (2024-12-17)
      The Sun is the primary external energy source for all planets in the Solar System. Its radiative flux, known as solar irradiance, plays a crucial role in planetary atmosphere modeling. Accurate spectral solar irradiance ...
    • Iterative helioseismic holography 

      Müller, Björn (2024-08-28)
      The understanding of the solar interior, in particular the subsurface solar flows, is im- portant for understanding the solar activity cycle. Traditional local helioseismology does not use all the seismic information ...
    • Global-Scale Rossby Waves on Stars 

      Albekioni, Mariam (2024-07-17)
      Rossby waves (r-modes) arise due to the conservation of absolute vorticity on rotating spheres. The waves govern the large-scale dynamics of the Earth's atmosphere/oceans and have been intensively studied during decades. ...
    • 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 ...
    • Small-scale dynamo in cool main-sequence stars 

      Bhatia, Tanayveer Singh (2023-04-13)
      Cool stars have an outer convection zone which can produce magnetic fields. These fields have a large scale component that is dependent on the solar cycle, as well as small-scale component largely independent of the cycle. ...
    • A coronal loop in a box: From energy generation to coronal emission 

      Breu, Cosima Alexandra (2023-03-17)
      The corona is the outer atmosphere of the Sun. It contains an abundance of bright arcs that consist of hot plasma trapped by the magnetic field. These coronal loops are heated to temperatures far surpassing the solar surface ...
    • Strong magnetic fields and unusual flows in sunspots 

      Castellanos Duran, Juan Sebastian (2023-02-06)
      This thesis presents a study of sunspots, which are the most prominent features observed on the solar surface. Their structure is governed by the magnetic field. The umbra and penumbra of sunspots harbor different strengths ...
    • 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 ...
    • Thermal Convection: Differential heating, travelling thermal waves and turbulent superstructures 

      Reiter, Philipp (2022-05-30)
      Turbulent thermal convection is ubiquitous in geophysical, astrophysical, and industrial applications. In the present work, various phenomena in the convective paradigm systems of horizontal convection and Rayleigh-Bénard ...
    • 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 ...
    • Follow-up and dynamical analysis of Kepler targets with transit timing variations 

      Freudenthal, Jantje (2020-06-04)
      The exact characterisation of planets, their host stars and the structure of their systems is an essential part of exoplanet research. This helps to understand the formation and evolution of planetary systems. Planets ...
    • 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 ...
    • Crustal thickness from seismic noise correlations in preparation for the InSight mission to Mars 

      Becker, Gesa Karen (2018-08-31)
      The formation of terrestrial planets is still poorly understood. Studying the interior of Mars by analysing seismic waves can help to answer questions about that process. In the absence of plate tectonics, Mars has retained ...
    • Slender Ca II H fibrils observed by SUNRISE/SuFI 

      Gafeira, Ricardo Jorge Maranhas (2018-04-24)
      This thesis is devoted to analyzing the morphological and oscillatory properties of slender \caiih{} fibrils (SCFs) in the lower solar chromosphere. The aim of this study is to deepen our understanding of the physical ...
    • 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 ...