A5062180692- Lightning and Electromagnetic Phenomena
- Earthquake Detection and Analysis
- Ionosphere and magnetosphere dynamics
- Seismic Waves and Analysis
- Geomagnetism and Paleomagnetism Studies
- Geophysics and Sensor Technology
- Fire effects on ecosystems
- Geology and Paleoclimatology Research
- Solar and Space Plasma Dynamics
- Gamma-ray bursts and supernovae
- Astro and Planetary Science
- Spacecraft Design and Technology
- Quantum optics and atomic interactions
- Plant responses to elevated CO2
- Atomic and Subatomic Physics Research
- Tropical and Extratropical Cyclones Research
- Cryospheric studies and observations
- Oceanographic and Atmospheric Processes
- Geophysical and Geoelectrical Methods
- GNSS positioning and interference
- Ocean Waves and Remote Sensing
- High-pressure geophysics and materials
- Atmospheric Ozone and Climate
- Polar Research and Ecology
- Inertial Sensor and Navigation
HUN-REN Institute of Earth Physics and Space Science
2019-2025
Eötvös Loránd University
2016-2025
University of Szeged
2019-2023
University of Pecs
2022
Centre for Ecological Research
2022
Research Centre for Astronomy and Earth Sciences
2019-2021
Konkoly Observatory
2020-2021
Von Karman Institute for Fluid Dynamics
2019-2021
Hungarian Academy of Sciences
2019
Abstract Responses of the AC and DC global electric circuits (GECs) to large eruption Hunga Tonga‐Hunga Ha'apai (HT‐HH) volcano on 15 January 2022 are discussed. The AC‐related investigation is based Schumann resonance (SR) measurements from six stations four continents. DC‐related utilizes atmospheric field (potential gradient, PG) recording in Europe USA. According data GLD360 WWLLN lightning detection networks, peak stroke rate, 83/s, was dominated by negative polarity lightning, but...
Abstract Multistation observations of Schumann resonance (SR) intensity document common behavior in the evolution continental‐scale lightning activity two super El Niño events, occurring 1997/98 and 2015/16. The vertical electric field component SR at Nagycenk, Hungary horizontal magnetic components Rhode Island, USA 1997, 2014–2015, Hornsund, Svalbard Eskdalemuir, United Kingdom as well Boulder Creek, California Alberta, Canada exhibit considerable increases from some tens percent up to a...
The brightest gamma-ray burst ever observed, long-duration GRB 221009A, was detected by GRBAlpha nano-satellite without saturation. We present light curves of the prompt emission in 13 energy bands, from 80 keV to 950 keV, and perform a spectral analysis calculate peak flux isotropic-equivalent luminosity. Since satellite's attitude information is not available for time this GRB, more than 200 incident directions were probed order find median luminosity its systematic uncertainty. found that...
Abstract Pc1 pulsations cover the 0.2–5 Hz frequency range with electromagnetic ion cyclotron (EMIC) waves of magnetospheric origin being generally accepted as their most important source. In ionosphere, initially transverse EMIC can couple to compressional mode and propagate long distances in ionospheric waveguide. By studying topside we obtain information on spatial distribution both (incident EMIC) waves. present paper, make use a new Swarm L2 product developed for characterizing explore...
Abstract. Lightning is a significant source of nitrogen oxides (NOx ≡ NO + NO2) in the free troposphere. Variations global lightning activity influence long-term trends (LTT) and inter-annual variability (IAV) tropospheric NOx, ozone (O3) hydroxyl radicals (OH). However, accurately quantifying these impacts hindered by uncertainties representing year-to-year fluctuations models. Here, we apply Schumann Resonance (SR) observations, which are sensitive to changes activity, better constrain...
This study focuses on the time synchronization between 15 Extremely Low Frequency (ELF, 3 Hz–3 kHz) stations operated by 6 scientific institutions, which is critical for accurate detection and localization of ELF transients their corresponding source lightning stroke. After identifying applying an amplitude threshold filtered series, was assessed comparing differences detected at paired stations. Most demonstrated proper synchronization, but significant timing discrepancies were found...
In July 2020, a detailed ELF/VLF noise test was carried out in the Széchenyi István Geophysical Observatory. This included temporary installation of pair LEMI-type induction coil magnetometers that run from battery during period (9 2020) when power supply observatory gradually shut down. As coils were installed two days before day (7 July) and continued to operate until 13rd July, there several both permanent systems operation. this study, we use overlapping further investigate...
Abstract An inversion algorithm for multistation Schumann resonance measurements is presented and tested in this paper. The location intensity of the lightning activity estimated absolute unit (C 2 km /s) from electromagnetic field components measured at distant observation sites on globe. We summarize main steps forward modeling single multiple sources describe characteristics applied inversion. applicability via synthetic data.
The Earth–ionosphere cavity resonator is occupied primarily by the electromagnetic radiation of lightning below 100 Hz. phenomenon known as Schumann resonances (SR). SR intensity an excellent indicator activity and its distribution on global scales. However, long-term measurements from high latitude stations revealed a pronounced in-phase solar cycle modulation seemingly contradicting optical observations satellite, which do not show any significant variation in spatial scale....
Abstract The electromagnetic waves in the Schumann resonance (SR) frequency range (<100 Hz) radiated by natural “lightning antennas” excite Earth‐ionosphere cavity confined between Earth's surface and lower ionosphere. peak frequencies of SR are known to vary with source‐observer distance (SOD), while daily (DFR: f max − min ) is also indicative average size thunderstorm regions. This paper provides observational evidence for these relationships based on observations vertical electric (E...
Abstract. The Széchenyi István Geophysical Observatory, also known as the Nagycenk Observatory (NCK), was established in 1957. It has been only measurement site Hungary where observations of various parameters atmospheric global electric circuit are made framework organized research under umbrella Hungarian Academy Sciences (MTA). Measurements electrical potential gradient (PG) and Schumann resonances (SRs) running quasi-continuously observatory for decades provide an invaluable source...
Abstract The importance of lightning has long been recognized from the point view climate‐related phenomena. However, detailed investigation on global scales is currently hindered by incomplete and spatially uneven detection efficiency ground‐based networks restricted spatio‐temporal coverage satellite observations. We are developing different methods for investigating activity based Schumann resonance (SR) measurements. SRs electromagnetic resonances Earth‐ionosphere cavity maintained...
Aims. Since it launched on 22 March 2021, the 1U-sized CubeSat GRBAlpha operates and collects scientific data high-energy transients, making smallest astrophysical space observatory to date. is an in-orbit demonstration of a gamma-ray burst (GRB) detector concept suitably small fit into standard 1U volume. As was demonstrated in companion paper, adds significant value community with accurate characterization bright GRBs, including recent outstanding event GRB 221009A. Methods. The 75 × 5 mm...
Abstract Pronounced global cooling around the Eocene–Oligocene transition (EOT) was a pivotal event in Earth’s climate history, controversially associated with opening of Drake Passage. Using physical laboratory model we revisit fluid dynamics this marked reorganization ocean circulation. Here show, seemingly contradicting paleoclimate records, that our experiments pathway yields higher values mean water surface temperature than “closed” configuration. This mismatch points to importance role...
The brightest gamma-ray burst ever observed, long-duration GRB 221009A, was detected by GRBAlpha nano-satellite without saturation. We present light curves of the prompt emission in 13 energy bands, from 80 keV to 950 keV, and perform a spectral analysis calculate peak flux isotropic-equivalent luminosity. Since satellite's attitude information is not available for time this GRB, more than 200 incident directions were probed order find median luminosity its systematic uncertainty. found that...
The spatial coverage of the energetic electron precipitation (EEP) region during three substorms has been determined using a combination ground-based instruments in North America. primary datasets used to determine presence or absence EEP are riometer measurements cosmic noise absorption (CNA); attenuation 10–11 MHz atmospheric D-region ionosphere Super Dual Auroral Radar Network (SuperDARN); amplitude variations subionospheric very low frequency (VLF) propagation observed Antarctic-Arctic...
In this article, we introduce a lesser-known analytical treatment and new numerical approach to model electromagnetic wave propagation in the lowest part of extremely low-frequency (ELF) band (<; 100 Hz) that takes into consideration day-night asymmetry Earth-ionosphere cavity. We present tests showing two models produce practically same output, i.e., relative difference between them is less than 0.4%. Our result an important step toward inferring distribution intensity global lightning...
The electromagnetic waves in the Schumann resonance (SR) frequency range (<100 Hz) radiated by natural &#8220;lightning antennas&#8221; excite Earth-ionosphere cavity confined between Earth&#8217;s surface and ionospheric D-region of ~100 km height. This contribution provides observational evidence for relationships variations peak frequencies first three modes global/regional lightning dynamics based on SR observations vertical electric field component, EZ, at Nagycenk (NCK),...
The Central and Eastern European Infrasound Network (CEEIN) has been operating since 2019 in a collaboration of Hungarian, Czech, Romanian, Austrian, Ukrainian research institutes. study aims to extend the process categorisation infrasound signals that previously applied Hungarian array (PSZI) other CEEIN stations. method associating with thunderstorms relies on correlating detections both spatially temporally lighting data from Worldwide Lightning Location (WWLLN), which is considered...