A5019109081- Astrophysics and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Atmospheric Ozone and Climate
- Dark Matter and Cosmic Phenomena
- Geomagnetism and Paleomagnetism Studies
- Atmospheric chemistry and aerosols
- Cosmology and Gravitation Theories
- Electromagnetic Compatibility and Measurements
- Methane Hydrates and Related Phenomena
- Atmospheric aerosols and clouds
- Neutrino Physics Research
- Oceanographic and Atmospheric Processes
- Radio Wave Propagation Studies
- Electromagnetic Scattering and Analysis
- GNSS positioning and interference
- Climate variability and models
- Mathematical functions and polynomials
- Data Management and Algorithms
- Experimental and Theoretical Physics Studies
- Lightning and Electromagnetic Phenomena
- Electromagnetic Compatibility and Noise Suppression
- Time Series Analysis and Forecasting
- Radio Astronomy Observations and Technology
- Fractional Differential Equations Solutions
- Marine and fisheries research
Technical University of Munich
2023
Max Planck Institute for Physics
2023
Universitätsklinikum Erlangen
2023
Michigan State University
2023
Universität Hamburg
2021
GFZ Helmholtz Centre for Geosciences
2010-2015
Freie Universität Berlin
2011-2014
Max Planck Institute for Meteorology
2010
TU Dortmund University
2010
Max Planck Society
2009
Abstract. The impact of aerosols above and around the Tibetan Plateau on Asian Summer Monsoon during pre-monsoon seasons March-April-May 2007, 2008, 2009 is investigated by means remote sensing radiative transfer modelling. Four source regions are found to be responsible for high aerosol loading Plateau: Taklamakan Desert, Ganges Plains, Indus Arabian Sea. CALIPSO lidar satellite data, providing vertically resolved images aerosols, shows concentrations highest in lower 5 km atmosphere with...
Axions and axion-like particles (ALPs) are hypothetical that occur in extensions of the Standard Model candidates for cold dark matter. They could be detected through their oscillations into photons presence external electromagnetic fields. gammaALPs is an open-source python framework computes oscillation probability between axions/ALPs. In addition to solving photon-ALP equations motion, includes models magnetic fields different astrophysical environments such as jets active galactic...
We present the first application of a newly developed hierarchical Bayesian analysis framework for detection point-like sources high-energy neutrinos. verify that we are able to reproduce results standard frequentist approach case NGC 1068, Seyfert II galaxy. Our robust against reasonable variations spectral index prior. However, simulated event rates mainly atmospheric events do not agree with measurements, presumably due binning provided instrument response function. propose an adaptation...
We implement the effects of gravitational self‐attraction and loading (SAL) into a global baroclinic ocean circulation model investigate on sea level patterns, circulation, density distributions. compute SAL modifications as an additional force water masses at every time step by decomposing field bottom pressure anomalies spherical harmonic functions then applying Love numbers to account for elastic properties solid Earth. Considering in postprocessing turns out be insufficient, especially...
Numerous measurement devices and computer simulations produce geospatial time series that describe a wide variety of processes System Earth. A major challenge in the analysis such data is complexity described processes, which requires simultaneous assessment data’s spatial temporal variability. To address this task, geoscientists often use automated analyses to compute compact description data, ideally comprising characteristic states process under study their occurrence over time. The...
Abstract It has been recently claimed by two different groups that the spectral modulation observed in gamma rays from Galactic pulsars and supernova remnants can be due to conversion of photons into ultra-light axion-like-particles (ALPs) large-scale magnetic fields. While we show required best-fit photon-ALP coupling, g aγ ∼ 2 × 10 -10 GeV -1 , consistent with constraints observations photon-ALPs mixing vacuum, this is conflict other bounds, specifically CAST solar axion limit,...
Ocean bottom pressure (OBP) variability in the region of Agulhas Current off South African coast is a crucial variable understanding dynamic processes ocean, but measurements currently available lack either precision or spatial and temporal coverage.We provide quantitative estimate OBP throughout with help setup ROMS regional ocean model.Driving model boundary conditions from global atmospheric reanalysis data running it for 8 years, we are able to reproduce many characteristic properties...
Abstract. The impact of aerosols above and around the Tibetan Plateau on Asian Summer Monsoon during pre-monsoon seasons March-April-May 2007, 2008, 2009 is investigated by means remote sensing radiative transfer modelling. Four source regions are found to be responsible for high aerosol loading Plateau: Taklamakan Desert, Ganges Plains, Indus Arabian Sea. CALIPSO lidar satellite data, providing vertically resolved images aerosols, shows concentrations highest in lower 5 km atmosphere with...
We propose a novel approach to the detection of point-like sources high-energy neutrinos. Motivated by evidence for emerging in existing data, we focus on characterisation and interpretation these sources. The hierarchical Bayesian model is implemented Stan platform, enabling computation posterior distribution with Hamiltonian Monte Carlo. simulate population weak neutrino detected IceCube experiment use resulting data set demonstrate validate our framework. show that even challenging case...
A comparison of the lateral distribution function and pulse time profile Cerenkov light from individual cosmic-ray showers shows good correlation between these parameters for with sizes around 106 particles at sea level. This is as would be expected if both reflect pattern shower development in atmosphere. The relationship them not agreement a theoretical developed larger showers.
Published experimental work on the lateral distribution function of atmospheric Cerenkov light from cosmic-ray showers has been used to relate shape this distance shower maximum observer. This relationship then with authors' own data investigate between size and depth development for in range approximately 2*105 3*106 particles.
While there have been multiple reports of potential links between astrophysical sources and high-energy neutrinos, definitively identifying these remains challenging. No single result has surpassed the significance threshold for discovery, theoretical interpretation observations revealed new questions bigger picture neutrino astrophysics. In response to difficulties, we propose a novel approach that combines state-of-the-art methods with wealth information from multi-messenger models. Our...
The accuracy of solutions to boundary integral equations depends strongly on the quality numerical method by which singularities kernel are integrated. Results high precision obtained transforming singular part and applying Gaussian integration, where combination both methods can be considered as a new approach. In addition well-known tanh transformation, we present arctan transformation procedure, furthermore, inspect properties erf transformation. For rotation-symmetric problems,...