A5066690310- Geophysics and Gravity Measurements
- Geomagnetism and Paleomagnetism Studies
- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- GNSS positioning and interference
- Planetary Science and Exploration
- Spacecraft and Cryogenic Technologies
- Astro and Planetary Science
- Spacecraft Design and Technology
- Space Satellite Systems and Control
- Inertial Sensor and Navigation
- Earthquake Detection and Analysis
- Cryospheric studies and observations
- earthquake and tectonic studies
- Geological Formations and Processes Exploration
- Methane Hydrates and Related Phenomena
- Computational Physics and Python Applications
- Seismic Waves and Analysis
- Landslides and related hazards
- Astronomy and Astrophysical Research
- Geophysical and Geoelectrical Methods
- Stellar, planetary, and galactic studies
- Atmospheric and Environmental Gas Dynamics
- Community Development and Social Impact
- E-commerce and Technology Innovations
Graz University of Technology
2018-2024
Austrian Academy of Sciences
2010-2021
Space Research Institute
2008-2021
Institute of Geodesy and Geophysics
2020-2021
Institute of Geodesy and Cartography
2019-2020
Deutsche Telekom (Germany)
2017
Deutsche Telekom (United Kingdom)
2015
Federal Office of Metrology and Surveying
2009
Abstract. GOCO06s is the latest satellite-only global gravity field model computed by GOCO (Gravity Observation Combination) project. It based on over a billion observations acquired 15 years from 19 satellites with different complementary observation principles. This combination of measurement techniques key in providing consistently high accuracy and best possible spatial resolution Earth's field. The motivation for new release was availability reprocessed data Gravity Recovery Climate...
The Gravity Recovery Object Oriented Programming System (GROOPS) is a software toolkit written in C++ that enables the user to perform core geodetic tasks. Key features of include gravity field recovery from satellite and terrestrial data, determination orbits global navigation system (GNSS) measurements, computation GNSS constellations ground station networks. Next raw data processing, GROOPS capable operate on time series spatial directly analyze visualize computed sets. Most tasks...
It is shown that the evolution of planetary atmospheres can only be understood if one recognizes fact radiation and particle environment Sun or a planet’s host star were not always on same level as at present. New insights latest observations research regarding solar radiation, plasma solar/stellar magnetic field derived from proxies with different ages will given. We show extreme environments young Sun/stars have important implications for may responsible planets low gravity like early Mars...
Abstract. Although the knowledge of gravity Earth has improved considerably with CHAMP, GRACE, and GOCE (see appendices for a list abbreviations) satellite missions, geophysical community identified need continued monitoring time-variable component purpose estimating hydrological glaciological yearly cycles long-term trends. Currently, GRACE-FO satellites are sole dedicated provider these data, while previously GRACE mission fulfilled that role 15 years. There is data gap spanning from July...
Abstract In Gravity Recovery and Climate Experiment (GRACE) Follow‐on (GRACE‐FO) mission, similar to its predecessor GRACE, the twin satellites are equipped with three‐axis accelerometers, measuring non‐gravitational forces. After 1 month in orbit, during in‐orbit‐checkout phase, noise on GRACE‐D accelerometer measurements elevated resulted systematical degradation of data. For this reason, data need be replaced by synthetic data, so‐called transplant officially generated GRACE‐FO Science...
Observing Earth's gravity field variations by means of precise orbits is nowadays a common practice next to dedicated satellite missions. The reason for using kinematic low earth orbiting (LEO) satellites estimates instead dynamic or reduced-dynamic based on the fact that do not include priori information about field. To achieve highly accurate through use LEO positions, it paramount importance determine these positions as precisely possible. We investigated whether possible improve accuracy...
Abstract. It is well known that lithospheric electromagnetic emissions are generated before earthquakes occurrence. In our study, we consider the physical penetration mechanism of electric field from Earth's surface, through atmosphere-ionosphere layers, and until its detection in space by satellites. A simplified approach investigated using conductivity equation, i.e., ∇ˆσ·∇Φ)=0 case a vertical inclination geomagnetic lines. Particular interest given to profile near ground distribution at...
For the period July 2003 to August 2010, interplanetary coronal mass ejection (ICME) catalogue maintained by Richardson and Cane lists 106 Earth-directed events, which have been measured in-situ plasma field instruments onboard ACE satellite. We present a statistical investigation of Earth's thermospheric neutral density response means accelerometer measurements collected GRACE satellites, are available for 104 ICMEs in data set, its relation various geomagnetic indices characteristic ICME...
Global models of the Earth's static gravity field are crucial for geophysical and geodetic applications such as oceanography, tectonics, global reference systems. The combined model GOCO2025 is latest release GOCO* series derived solely from satellite observations. Data dedicated gravimetry missions GRACE, GRACE-FO, GOCE well laser ranging observations kinematic orbits satellites used to determine a together with regularized trend, an annual semi-annual oscillation. Starting GRACE in 2002...
Since the launch of ESA Swarm satellites in 2014, GPS data has been used to monitor monthly changes Earth’s gravity field at a spatial resolution larger than 1,500 km (half-wavelength). We have chosen processing strategies that do not rely on assumptions temporal and correlations, producing models are independent GRACE GRACE-FO data. team composed Astronomical Institute University Bern, Czech Academy Sciences, Delft Technology, Geodesy Graz School Earth Sciences Ohio State...
The project CASPER is an interdisciplinary collaboration between the Institute of Geodesy and Physics funded by Austrian Research Promotion Agency. It deals with influence solar eruptions such as coronal mass ejections flares on Earth's neutral atmosphere ionosphere. In this study we focus most severe geomagnetic storms that occurred in cycle 25. This includes effects extreme "Gannon storms" 10/11 May, well August October 2024. We present a detailed analysis various interplanetary...
Over the years, TU Graz has processed thermospheric densities for several satellite missions. Thanks to recent adaptations of our GROOPS software package, we have been able estimate such a time series TerraSAR-X, LEO in sun-synchronous orbit, up present day. In order make these data available researchers who are interested space weather related studies, switching new publishing scheme provide with less latency.Estimating from accelerometer measurements or GNSS observations is tedious process...
The current level of pooling and sharing between fixed mobile infrastructures is not sufficient to allow the most efficient use network resources, whether fixed, mobile, or Wi-Fi. In perspective 5G networks, resource infrastructures, called structural convergence, will be essential in path toward an integrated network. This convergence being triggered by different architecture trends, e.g., baseband unit hostelling fronthaul technologies, heterogeneous radio access and, importantly, a...
Abstract We present a refined statistical analysis based on interplanetary coronal mass ejections (ICMEs) as well corotating interaction regions (CIRs) for the time period 2003–2015 to estimate impact of different solar wind types geomagnetic activity and neutral density in Earth's thermosphere. For time‐based delimitation events, we rely catalog maintained by Richardson Cane region lists provided S. Vennerstrom Jian et al. (2011, https://doi.org/10.1007/s11207‐011‐9737‐2). These archives...
Abstract. In this study, we report on Total Electron Content (TEC) and Very Low Frequency (VLF) space measurements derived from Global Positioning System (GPS) DEMETER satellites, respectively. These are associated with the earthquake (EQ) of a magnitude 6.3, which occurred 6 April 2009, in L'Aquila (Italy). Anomaly features analysis TEC VLF observations recorded two weeks before after seismic event occurrence. A map an interpolated regional pixel resolution 1° × 15 min latitude, longitude...
Abstract With the successful launch of satellite mission Gravity Recovery and Climate Experiment (GRACE) Follow‐On in May 2018 opportunity arises to resume analysis accelerometer data regarding space weather induced perturbations Earth's thermosphere. On 21 August a complex interplanetary coronal mass ejections occurred on Sun, which subsequently triggered an unexpected large geomagnetic storm 26 August. We present detailed ejection eruption explore perturbation neutral density upper...
Abstract. We analyzed the measured thermospheric response of an extreme solar X17.2 flare that irradiated Earth's upper atmosphere during so-called Halloween events in late October/early November 2003. suggest such can serve as proxies for intense electromagnetic and corpuscular radiation environment Sun or other stars their early phases evolution. applied compared empirical thermosphere models with satellite drag measurements from GRACE satellites found Jacchia-Bowman 2008 model reproduce...