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Periodic variability in active galactic nuclei
(Univ. Köln, 2008)
In this doctoral thesis, multi-frequency very long baseline interferometry observations together with multi-frequency total flux-density variability data of compact relativistic jets in active galactic nuclei are presented ...
Electron acceleration in a flare plasma via coronal circuits
(Univ. Potsdam, 2008)
The Sun is a star, which due to its proximity has a tremendous influence on Earth. Since its very first days mankind tried to "understand the Sun", and especially in the 20th century science has uncovered many of the ...
The ISO-2MASS AGN survey
(Univ. Bochum, 2006)
Bei der Suche nach AGN im Optischen/UV werden kaum staubgerötete Objekte gefunden. Jedoch ist vom Radio/Röntgen-Bereich die Existenz solcher AGN bekannt. Da der obskurierende Staub die absorbierte Energie im Infraroten ...
NanoSIMS analysis and high resolution electron microscopy of silicate stardust grains from red giant stars and supernova explosions
(Univ. Frankfurt (Main), 2009)
This thesis deals with the analysis of presolar silicates and oxides by high resolution mass spectrometry and electron microscopy techniques. This stardust was identified by its extreme oxygen isotopic anomalies, which ...
Magnetic coupling of the solar photosphere and chromosphere
(Univ. Freiburg (Breisgau), 2008)
The solar surface outside sunspots and active regions, i.e., the quiet Sun, shows the ubiquitous pattern of granulation in the photosphere. The quiet solar photosphere harbors small-scale magnetic structures inside and ...
Developing a ground-based search system for transits of extrasolar planets
(Univ. Berlin, 2006)
The search for extrasolar planets is a relatively new field in astronomical and astrophysical sciences that was boosted by the first discovery of the exoplanet 51 Peg b in 1995 by radial velocity measurements. The short ...
Assessing the fidelity of the marine sedimentary magnetic record
(Univ. Bremen, 2008)
Marine sediments, diagenesis, anoxic environments, paleomagnetism, low-temperature magnetism, magnetic Fe-Ti-Oxides. - Magnetic particles usually occur in very minor concentrations in igneous and sedimentary rocks, soils, ...
Constraining uncertainty in climate sensitivity
(Univ. Potsdam, 2006)
Eine der entscheidenden Hauptquellen für Unsicherheiten von Klimaprojektionen ist, wie sensitiv das Klimasystem auf Änderungen der Strahlungsbilanz der Erde reagiert. Angesichts des kontinuierlichen Anstiegs der atmosphärischen ...
Development of pull apart basins and associated structures by the Riedel shear mechanism
(Univ. Bochum, 2006)
Die physikalischen und mechanischen Eigenschaften von tonartigen Materialien, die für die Skalierung von Analogexperimenten relevant sind, werden mit Hilfe von Konzepten der modernen Bodenmechanik analysiert. Ein Verfahren ...