Dokumente Fakultät für Physik (inkl. GAUSS) nach Gutachter "Reiners, Ansgar Prof. Dr."
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Realistic MHD simulations of spots on cool main-sequence stars
(2021-08-09)Sunspots are cool, dark features on the solar surface consisting of two distinct parts - the inner dark umbra and its surrounding brighter, filamentary penumbra. Strong, nearly vertical magnetic fields found in the umbra ... -
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 ... -
Simulations of magnetoconvection in cool main-sequence stars
(2014-05-26)In this thesis, the magnetoconvective processes in the nearsurface layers of cool main-sequence stars were studied in 24 three-dimensional local “box-in-a-star” simulations. For each of six sets of stellar parameters ... -
Solar Variability over the Last 9000 Years
(2018-08-31)The solar activity has been observed to vary at various time scales, of which the 11-year solar cycle is the most prominent one. Since the Sun provides the main external energy to the Earth, knowledge of solar variability ... -
Star-Planet Interactions: Emission Spectroscopy of H$_{3}^{+}$ in Extrasolar Giant Planet Atmospheres
(2019-08-26)Extrasolar giant planets (EGP) in a close-in orbit undergo extreme irradiation by their host star. Emission of H$_{3}^{+}$ is expected to support the stabilization of the planetary atmosphere, since the ion radiates in the ... -
The solar wind’s geomagnetic impact and its Sun--Earth evolution -- Predictive models for space weather and the Parker Solar Probe orbit
(2018-11-06)This thesis addresses two current topics in solar wind research and space weather. The first study is dedicated to the solar wind's impact on geomagnetic activity and the second study to the estimation of the solar wind ... -
Understanding the brightness variations of Sun-like stars on timescales of stellar rotation
(2021-01-21)Solar brightness varies on timescales from minutes to decades. In particular, the observed photometric variability can directly relate to the rotation period. Our understanding of this link allows extrapolations from the ... -
White-Light Mass Determination and Geometrical Modelling of Coronal Mass Ejections
(2019-01-21)Coronal Mass Ejections (CMEs) are explosive large-scale outbursts of the Sun’s coronal plasma and magnetic field. They can induce strong geomagnetic storms at Earth, which pose serious threats to space systems, communications ...