Dokumente Fakultät für Physik (inkl. GAUSS) nach Gutachter "Reiners, Ansgar Prof. Dr."
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3-D Modeling of Coronal Mass Ejections with STEREO/SECCHI Data
(2017-02-28)This thesis reports on the three-dimensional analysis of coronal mass ejections (CMEs) in order to answer questions about their morphology and to derive their three-dimensional geometry. The questions are about the ... -
Activity of M dwarfs in the CARMENES sample
(2021-11-16)The Calar Alto high-Resolution search for M dwarfs with Exo-earths with Near-infrared and optical Echelle Spectrographs (CARMENES) has been searching and finding planets for five years by looking for periodic Doppler-shift ... -
Analysis of Coronal Mass Ejection Kinematics and Dependencies on Source Region Properties
(2020-02-24)Coronal Mass Ejections (CMEs) are outbursts of coronal plasma bound in magnetic structures that are explosively accelerated. Their evolution into the heliosphere can be observed with coronagraphs and heliospheric imagers, ... -
Analysis of solar faculae using stray-light-corrected spectropolarimetric data and numerical simulations
(2022-04-28)The objective of this thesis is to develop methods to improve the quality of restored ground-based observations, and to use such restored observations, along with 3D radiative MHD simulations, to study the properties of ... -
Analysis of Space Weather Impacts on the Terrestrial Ionosphere and Development and Testing of a Coronagraph for Space Weather Forecasts
(2020-07-22)The ionosphere is a conductive layer of the Earth's atmosphere, characterised by the presence of free electrons. Through interaction with electromagnetic waves, it influences a wide spectrum of radio wave communications, ... -
Characterisation of star-planet systems
(2017-07-05)After the first confirmed detection of an exoplanet in 1995, their number has significantly increased to 3 557 confirmed planets around other stars (www.exoplanet.eu, Dec. 2016). The most successful techniques for planet ... -
Construction and Analysis of a Microwave-induced Plasma Lamp for Precision Spectroscopy
(2016-06-09)Spectroscopy is one of the most powerful techniques to analyze light of astronomical objects. New instrumentation strives to extend high-precision spectroscopy from the optical to the near-infrared spectral range. This ... -
Coronal dynamics driven by magnetic flux emergence
(2015-11-09)The corona is the Sun’s outer atmosphere which is more than 100 times hotter than the solar surface. It can be brilliantly observed in the extreme-ultraviolent (EUV) and soft X-ray passbands. What heats the corona is one ... -
Dynamics of Suspended Dust Grains: Experimental Investigations and Implications for Protoplanetary Discs
(2018-05-29)The collective interaction of solid particulate matter with flowing gas is one of the fundamental processes occurring in planet-forming discs. Small dust grains and pebbles are comparable to or smaller than the mean ... -
Effect of density stratification on dynamos in gas planets and low-mass stars
(2015-05-29)Numerical simulations of the Geodynamo have reproduced many of the features of the Earth's magnetic field. An ensemble of these simulations has been used to formulate a predictive scaling law which agrees with the Earth's ... -
Exoplanet Atmosphere Characterization with High-Resolution Doppler Spectroscopy
(2023-03-24)Ultra-hot Jupiters (UHJs) are a class of giant strongly irradiated exoplanets with dayside temperatures exceeding 2200 K. Due to their elevated temperatures, these objects are prime targets for atmospheric characterization ... -
Fabry-Pérot etalons for high precision radial velocity calibration
(2014-06-24)The current generation of astronomical spectrographs can measure radial velocity signals of exoplanets down to a few m/s, in ideal cases even 60 cm/s can be achieved. This led to the discovery of rocky planets with masses ... -
High resolution scattering spectropolarimetry of the quiet solar photosphere
(2021-01-14)In this thesis we investigate small-scale scattering polarization signals in quiet, internetwork (IN) regions of the lower solar atmosphere. Small-scale polarization signals are inherently hard to observe due to their ... -
How does stellar convection impact the detection of small planets at high radial velocity precision?
(2022-08-15)One of the big driving forces behind exoplanet research is the search for an Earth-twin to answer the old question of whether or not humanity is alone in the universe. According to simple logic as well as our current ... -
Laser Frequency Combs for High Resolution Spectrograph Calibration
(2021-10-28)While laser frequency combs (LFCs) are in principle ideal calibration light sources for high resolution spectrographs, they are still not regularly used. This is not only due to high cost and maintenance, but also persistent ... -
Modelling turbulent effects of stellar feedback in cosmological simulations
(2017-10-30)In order to study the influence of turbulence on star formation, stellar feedback, and the mixing of metals into the circumgalactic medium (CGM), we implemented a model for star formation and stellar feedback and employ ... -
Nanoscale Waveguiding Studied by Lensless Coherent Diffractive Imaging using EUV High-Harmonic Generation Source
(2017-07-24)The challenge of nanometric imaging drives intense efforts in applied sciences and fundamental research. Following the physical law of diffraction, the utilization of extreme ultraviolet (EUV) or X-ray radiation for imaging ... -
Photometric variability in the Kepler field
(2013-09-23)Measurements of rotation and differential rotation for more than 20,000 active Kepler stars. -
Precision Spectroscopy on OH
(2019-06-14)This thesis describes the implementation of a high precision laser system which, as a first demonstration of its capabilities, has been used to measure electronic transitions from the X²Π₃⸝₂, v''=0, J''=3/2 rovibronic ... -
Radial velocities in low mass stars: improving the wavelength solution of astronomical spectrographs and understanding stellar noise
(2017-11-10)The radial velocity method has been used to discover hundreds of extrasolar planets in the past two decades. The continuous improvements in radial velocity precision have revealed several rocky planets in the habitable ...