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Mass distribution at the galactic centre
(Univ. Köln, 2005)
In the framework of this PhD thesis, the study of the distribution of an extended mass close to the super-massive black hole (SMBH) at the centre of our Galaxy is addressed using observational data and theoretical modelling. ...
Multi-component evolution, age and plate tectonic setting of high MG lamprophyric dikes and small gabbroic intrusions on Isla Margarita (Venezuela)
(Univ. Bochum, 1997)
Die Isla Margarita (Venezuela) am Südrand der Karibischen Platte besteht aus einem heterogenen Krustenkomplex aus Peridotiten, Metamorphiten, diversen Magmatiten und sedimentärem Deckgebirge. Die jüngsten Magmatite sind ...
Probing quasar sight lines in three dimensions
(Univ. Potsdam, 2005)
Strong damped Lyman alpha absorption (DLA) lines seen spectra of distant quasar are believed to arise when the sight line to the quasar goes trough the disc of a galaxy or a proto galaxy. Most of the neutral matter in the ...
The late Quaternary environmental and climatic history of North-East Greenland, inferred from coastal lakes
(Univ. Köln, 2009)
Eleven lakes and ponds and three lacustrine sediment sequences from coastal East and North-East Greenland were studied for recent hydrological and phytoplankton characteristics and for palaeolimnology, respectively. The ...
Ionospheric Signatures of Secondary Waves From Quasi‐6‐Day Wave and Tide Interactions
(
- Journal of Geophysical Research: Space Physics
, 2021-03-31)
A sudden stratospheric waring occurred in the southern hemisphere during September 2019, accompanied by an exceptionally strong quasi‐6‐day wave (Q6DW). We examine the ionospheric response using global total electron content ...
Inverse Comptonstreuung und die Hochenergie-Emission relativistischer Stoßwellen
(Univ. Bochum, 2005)
In dieser Arbeit wird die inverse Comptonstreuung behandelt. Bei diesem Prozess streuen Elektronen niederenergetische Photonen zu höheren Energien; für die Anwendung auf die Jets aktiver galaktischer Kerne wird der sogenannte ...
Modeling atmospheres of classical novae in X-rays with PHOENIX
(Univ. Hamburg, 2005)
PHOENIX has been used to calculate model atmospheres of classical novae in the X-ray spectral range. The models account for an expanding, one-dimensional spherically symmetric medium in full non-local thermodynamic ...
Untersuchungen zur Gaschemie und Anwendbarkeit isotopischer Geothermometrie an hydrothermalen Systemen des mittelatlantischen Rückens
(Univ. Hamburg, 2009)
In der vorliegenden Arbeit wurde untersucht, welche Parameter die Anwendbarkeit der Geothermometer für Wasserstoff, im System Wasserstoff/ Methan/ Wasser, und Kohlenstoff, im System Methan/ Kohlendioxid, bestimmen. Dazu ...
The Contribution of Sprite Streamers to the Chemical Composition of the Mesosphere-Lower Thermosphere
(
- Geophysical Research Letters
, 2020)
Sprites are mesospheric filamentary discharges that liberate and accelerate large quantities of electrons. They produce local enhancements of some chemical species and fast (millisecond) optical emissions. In this work, ...
Oblique Gravity Wave Propagation During Sudden Stratospheric Warmings
(
- Journal of Geophysical Research: Atmospheres
, 2020)
Gravity waves (GWs) are important for coupling the mesosphere to the lower atmosphere during sudden stratospheric warmings (SSWs). Here, a minor SSW is internally generated in a simulation with the upper-atmosphere ...