A5060546422- Earthquake Detection and Analysis
- Astro and Planetary Science
- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Geomagnetism and Paleomagnetism Studies
- Seismic Waves and Analysis
- Planetary Science and Exploration
- earthquake and tectonic studies
- Seismology and Earthquake Studies
- Geophysics and Gravity Measurements
- Geophysics and Sensor Technology
- GNSS positioning and interference
- Astronomical Observations and Instrumentation
- Atomic and Subatomic Physics Research
- Space Satellite Systems and Control
- Radio Astronomy Observations and Technology
- Atmospheric Ozone and Climate
- Geophysical and Geoelectrical Methods
- Stellar, planetary, and galactic studies
- Magnetic confinement fusion research
- Gamma-ray bursts and supernovae
- Methane Hydrates and Related Phenomena
- Advanced Fiber Optic Sensors
- Astrophysics and Cosmic Phenomena
- Space Exploration and Technology
Austrian Academy of Sciences
2016-2025
Space Research Institute
2016-2025
Schmidt Institute of Physics of the Earth
2020
Université de Versailles Saint-Quentin-en-Yvelines
2020
Laboratoire atmosphères, milieux, observations spatiales
2020
Centre National de la Recherche Scientifique
2020
University of Rome Tor Vergata
2020
University of Bari Aldo Moro
2010-2020
China Earthquake Administration
2020
Ecologie des Forêts de Guyane
2004-2005
We study the sub-ionospheric VLF transmitter signals recorded by Austrian Graz station in year 2020. Those radio are known to propagate Earth-ionosphere waveguide between ground and lower ionosphere. The facility (geographic coordinates: 15.46°E, 47.03°N) can receive such signals, particularly those propagating above earthquake (EQ) regions southern part of Europe. consider this work amplitude variations a few weeks before occurrence two EQs Croatia at distance less than 200 km from...
Abstract. The VLF/LF radio signals method for studying preseimic activity is applied to the Abruzzo earthquake (M=6.3, 6 April 2009). data collected by three receivers located in Moscow (Russia), Graz (Austria) and Bari (Italy) at about 3000 km, 1000 km 500 from epicenter were used. received Sardinia (20.27 kHz) Sicily (45.9 transmitters, both Italy, compared with those Iceland (37.5 kHz), Great Britain (19.58 Germany (23.4 transmitters. propagation paths of two Italian transmitters cross...
Various types of changes in the characteristics very low frequency (VLF) signals before earthquakes have been presented during past few decades. Most these observed on data with time sampling order a tenths second or minutes. Improvements this recent years indicated three new whose onsets minutes tens earthquake. These manifest themselves as reductions VLF signal amplitude and phase noises, excitation attenuation waves small wave periods both [1-5].In work, we present list parameters domains...
Electric field amplitude and phase measurements between narrowband VLF/LF transmitters receivers in the sub-ionospheric waveguide are affected altered by man-made natural sources (Nina 2024; Boudjada et al., 2024a,b). In this study we investigate Mw≥5.0 earthquakes (EQs) which occurred Europe during year 2024 based on data from INFREP receiver network (Biagi 2019; Moldovan 2015; Galopeau 2023). selected Mediterranean area with geographical longitude [-10°E, 40°E]...
In recent decades, significant efforts have been devoted to understanding and interpreting the link between ionospheric perturbations natural or anthropogenic phenomena, such as seismic activity, electrical geomagnetic storms, unidentified radio emissions. This is achieved through various methods among which also study of electromagnetic (EM) wave propagation in very low frequency (VLF, 3–30 kHz) (LF, 30–300 bands. These bands enable long-distance communication,...
We analyze the electric field measurements recorded by radio and plasma wave experiment (RPWS) onboard Cassini spacecraft. This mission has been designed to study mostly waves emissions in environment of Saturn (Galopeau et al., 2007). RPWS instrument allowed investigate Saturnian magnetosphere its vicinity over a frequency range from 1 Hz 16 MHz. RWPS dynamic spectra displayed Type II intensity variation (in dB) versus kHz) observation time UT). The daily spectral features are principally...
We have investigated the angular distribution of Jovian decameter radiation occurrence probability, relatively to local magnetic field B and its gradient ∇B in source region, using model for Jupiter, based on Juno’s first nine orbits observations, JRM09, was recently proposed by Connerney et al. [Geophys. Res. Lett., 45, 2590-2596, 2018]. The results were compared those obtained earlier older models (O6, VIP4, VIT4 VIPAL). JRM09 confirms former results: radio emission is...
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...
Abstract. This work presents ground based Ultra Low Frequency (ULF) magnetic field measurements in the frequency range from 10–15 mHz 1 January 2008 to 14 April 2009. In this time period a strong earthquake series hit Italian Abruzzo region around L'Aquila with main stroke of magnitude M = 6.3 on 6 frame South European Geomagnetic Array (SEGMA), collaboration runs ULF fluxgate instruments providing continuously data recorded mid- and south Europe. The scientific objective is investigation...
Abstract. The classic approach to calculate the electrostatic field penetration, from Earth's surface into ionosphere, is consider following equation ∇·(σ·∇Φ)=0 where σ and Φ are electric conductivity potential of field, respectively. penetration characteristics strongly depend on conductivities atmosphere ionosphere. To estimate up orbital height DEMETER satellite (about 700 km) role ionosphere must be analyzed. It done with help a special upper boundary condition for atmospheric field. In...
Taking the 2018 Ms6.9 Indonesia earthquake as a case study, ionospheric perturbations in very low frequency (VLF) transmitters recorded by China Seismo-Electromagnetic Satellite (CSES) were mainly investigated, well multi parameters of plasma and electromagnetic field. The characteristics electron density (Ne), GPS TEC, ULF electric field, ion drift velocity, ionosphere height extracted compared with features signal-noise ratio (SNR) from VLF NWC at southern hemisphere JJI northern...
We suggest an additional possible plasma source to explain part of the phenomena observed for transiting hot Jupiters WASP-12b and HD 189733b in their ultraviolet (UV) light curves. In proposed scenario, material outgasses from molten surface Trojan satellites on tadpole orbits near Lagrange points L4 L5. show that temperature at orbital location is high enough melt rocky bodies form shallow lava oceans them. case WASP-12b, this leads release elements such as Mg Ca, which are expected...
VLF/LF (20 - 300 kHz) radio waves propagation is affected by different factors such as meteorological conditions, solar bursts and geomagnetic activity. At the same time, variations of some parameters in ground, atmosphere ionosphere occurring during preparatory phase earthquakes can produce disturbances previous signals along their paths: these are precursors. Since 2009, several receivers have been installed throughout Europe order to realize a European (VLF/LF) network for studying...
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. We present the results of ground-based Ultra Low Frequency (ULF) magnetic field measurements observed from June to August 2004 during Bovec earthquake on 12 July 2004. Further we give information about seismic activity in local observatory region for an extended time span and 2005. ULF data are provided by South European Geomagnetic Array (SEGMA) where experience heritage CHInese MAGnetometer (CHIMAG) fluxgate magnetometer comes application. The intensities horizontal H vertical Z...
Abstract. We investigate the VLF emissions observed by Instrument Champ Electrique (ICE) experiment onboard DEMETER micro-satellite. analyze intensity level variation 10 days before and after occurrence of l'Aquila earthquake (EQ). found a clear decrease received signal related to ionospheric whistler mode (mainly Chorus emission) transmitted DFY station in Germany, few (more than one week) earthquake. The power spectral density decreases more two orders magnitude until EQ, it recovers...
Abstract Seismogenic models have been recently proposed to explain precursors before earthquakes occurrences. Those refer physical processes linking the lithosphere, atmosphere, and ionosphere. We analyze in this work curl‐free current model describing flow from lithosphere ionosphere through atmosphere. use a numerical simulation based on finite element method derive between ground shown that approximation of atmospheric density leads significant unpredictable distortions solutions...
Abstract We investigate the emission cone of Io‐controlled Jovian decameter radiation from layout sources in central meridian longitude (CML)‐Io phase diagram where occurrence is plotted versus (CML) and satellite Io. Four zones enhanced probability are revealed this named Io‐A, Io‐B, Io‐C, Io‐D. propose an angular representation CML‐Io a coordinate system linked to local magnetic field radio source gradient field. The distribution such clearly shows that radiated hollow which not...
This paper presents the first high‐resolution dynamic spectra of Saturn kilometric radiation acquired upon Cassini's approach and orbits Saturn. The emissions display upward downward drifting features with bandwidths down to ∼200 Hz drift rates a few kHz per second. At other times, are much more diffuse or continuous, showing little spectral structure on scales 10 20 kHz. fine is strikingly similar Earth's auroral (AKR) Jovian radio in many respects. provide insight into highly nonlinear...
Abstract. In this paper we describe the Graz seismo-electromagnetic very low frequency (VLF) facility, as part of European VLF receiver network, together with scientific objectives and results from two years operation. After a brief technical summary present system – heritage predecessor facility i.e. hardware, software, operational modes environmental influences, discuss statistical data events related to terrestrial propagation over Europe.
We investigate the recent earthquakes (EQs) that occurred on 06 February 2023 principally in central southern part of Turkey and north western Syria. The tectonic plate movements between Anatolian, Arabian African plates are well known to be subject EQs. coordinate epicenter was 37.08°E 37.17°N with depth order 10 km a magnitude Mw7.8. Beside aftershocks, few hours later strong Mw7.7 earthquake same region . consider this analysis Bafa VLF transmitter (TBB) signal emitting...
Strong natural hazards together with their societal impact are usually accompanied by multiple physical phenomena which can be an important information source about the underlying processes.  In this study we statistically analyze lithosphere–atmosphere–ionosphere couplings of magnitude Mw5.5+ earthquakes (EQs) in year 2023 aid sub-ionospheric VLF/LF radio links. The electric field amplitude and phase measurements a temporal resolution one second from...