Blättern Fakultät für Physik (inkl. GAUSS) nach "Gizon, Laurent Prof. Dr." Betreuer
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Analysis of time series of solar-like oscillations - Applications to the Sun and HD52265
(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 ... -
Brightness Contrast of Solar Magnetic Elements Observed by Sunrise
(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 ... -
Data Compression for Helioseismology
(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 ... -
Differential rotation in Sun-like stars from surface variability and asteroseismology
(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 ... -
Helioseismic diagnostics of solar dynamics in the near-surface layers
(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 ... -
Inverse Problems in Local Helioseismology
(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 ... -
Measuring vortical flows in the solar interior
(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 ... -
Modeling experiments in helioseismic holography
(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 ... -
Observations of large-scale solar flows
(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. ... -
On the Detection of Exomoons in Photometric Time Series
(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 ... -
Simulating the signature of starspots in stellar oscillations
(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 ... -
Solar surface flows during active region emergence
(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 ... -
Studies of the radial gradient of rotation near the solar surface
(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 ... -
Theory of solar oscillations in the inertial frequency range
(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. ...