A5003317198- Lightning and Electromagnetic Phenomena
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Earthquake Detection and Analysis
- Solar and Space Plasma Dynamics
- Fire effects on ecosystems
- Planetary Science and Exploration
- Seismic Waves and Analysis
- High voltage insulation and dielectric phenomena
- Geomagnetism and Paleomagnetism Studies
- Atmospheric aerosols and clouds
- Electrical Fault Detection and Protection
- Stellar, planetary, and galactic studies
- Spacecraft Design and Technology
- Electrostatic Discharge in Electronics
- Space Exploration and Technology
- Meteorological Phenomena and Simulations
- Underwater Acoustics Research
- Electromagnetic Compatibility and Noise Suppression
- Geophysics and Sensor Technology
- Radio Wave Propagation Studies
- Power Line Communications and Noise
- GNSS positioning and interference
- Impact of Light on Environment and Health
- Geophysics and Gravity Measurements
Czech Academy of Sciences, Institute of Atmospheric Physics
2016-2025
Charles University
2016-2025
Czech Academy of Sciences
2022
Boston University
2022
The Radio and Plasma Waves (RPW) instrument on the ESA Solar Orbiter mission is described in this paper. This designed to measure in-situ magnetic electric fields waves from continuous a few hundreds of kHz. RPW will also observe solar radio emissions up 16 MHz. primary importance science requirements since it essential answer three four overarching objectives. In addition exchange on-board data with other instruments order process algorithms for interplanetary shocks type III langmuir detections.
Abstract Lower‐band whistler‐mode emissions can influence the dynamics of outer Van Allen radiation belts. We use 11 years measurements STAFF‐SA instruments onboard four Cluster spacecraft to systematically build maps wave propagation parameters as a function position. determine probability distributions vector angle weighted by intensity. The results show that directions intense waves are close Gaussian‐shaped peak centered on local magnetic field line. width this is between 10 and 20...
About 45 lightning flashes occur per second all around the Earth with a predominant distribution over continents and along inter-tropical band. While different types of Transient Luminous Events (TLEs) induced by can be produced above thunderstorms, Terrestrial Gamma Ray Flashes (TGFs) are bursts high-energy photons originating from Earth’s atmosphere in association thunderstorm activity great majority TGFs occurring region. In addition to those radiation bursts, another type...
This study examines the initiation of two intracloud (IC) and cloud-to-ground (CG) lightning flashes using electric field change (FA) sensors VHF (LogRF) located at seven sites near Oxford, Mississippi, USA. For each flash initiating event caused a pulse in LogRF data started an Initial E-Change (IEC) FA data. The pulses had powers <1 W durations ~1 μs. Numerous occurred during IEC; these ≤3 Fewer ≤7 During IEC, few were coincident with pulse, most such pairs enhanced no IEC enhancing events...
Abstract. We investigate properties of the electromagnetic activity following first lightning return stroke (RS), using concurrent observations from SLAVIA (Shielded Loop Antenna with a Versatile Integrated Amplifier) sensor, SAETTA (Suivi de l'Activité Electrique Tridimensionnelle Totale l'Atmosphère) Lightning Mapping Array (LMA) and METEORAGE LF (low-frequency) network in Corsica region. From data collected between September December 2015, we selected 66 negative cloud-to-ground (−CG) 26...
By combining space-based data from the Lightning Imaging Sensor (LIS) aboard International Space Station (ISS) with broadband ground-based electromagnetic measurements, we investigate relationship between emissions lightning processes and their optical signatures, focusing on initiation phase. Our case study is based SLAVIA (Shielded Loop Antenna Versatile Integrated Amplifier) magnetic detectors at various European locations, as well location systems ENTLN (Earth Networks Total Network),...
Electromagnetic (EM) waves generated by lightning strokes in the Earth&#8217;s atmosphere are important phenomena regarding loss of energetic electrons from Van Allen radiation belts. During lightning-induced electron precipitation (LEP) events, these EM interact with trapped belt electrons, decreasing their pitch angle, and causing eventual atmosphere. LEP events satellite data characterized a sudden increase wave intensity over wide range frequencies, accompanied an precipitating flux....
M-components are transient enhancements of the channel luminosity occurring simultaneously with continuing current phase cloud-to-ground lightning. They initiated by connection in-cloud to grounded channel. We have developed a new model M-component processes, which is based on numerical solution Maxwell&#8217;s equations together Poisson&#8217;s equation for given thundercloud charge structure. compute radiated electric and magnetic fields at various distances from lightning...
Thunderclouds and lightning produce high-energy radiation over a wide range of time scales. Terrestrial gamma-ray flashes (TGFs) are brief emissions lasting ~100 &#181;s, consisting photons with energies ranging from 20 keV to 40 MeV. Simultaneous ground-based measurements electromagnetic fields have found TGFs be associated the evolutionary phases both intracloud cloud-to-ground discharges.Gamma-ray glows, on other hand, last few seconds several tens minutes, typically coincide passage...
Jupiter was the first planet other than Earth, where lightning discharges were detected using radio wave measurements of Voyager spacecraft in&#160;1979. Starting with Voyager&#160;1, all missions to as bright spots in optical images nightside planet. The Juno currently orbits and its audible frequency range below 20&#160;kHz often show rapid whistlers, electromagnetic signatures electrical very low dispersion. These represent largest known database detections at this planet.We...
Abstract Lightning‐induced electron precipitation (LEP) events are important phenomena in the Earth's inner magnetosphere, where atmospheric lightning strokes cause energetic loss from radiation belts. Lightning generate electromagnetic waves that penetrate ionosphere and propagate through magnetosphere as so‐called lightning‐generated whistlers. They interact with belt electrons, decreasing their pitch angles causing eventual atmosphere. At low altitudes, LEP satellite data characterized by...
With LOFAR we have been able to image the development of lightning flashes with meter-scale accuracy and unprecedented detail. We discuss primary steps behind our most recent mapping method. To demonstrate capabilities technique show interpret images first few milliseconds two intra-cloud flashes. In all negative leaders propagate in charge layer below main charge. Among several interesting features that about 2~ms after initiation Primary Initial Leader triggers formation a multitude (more...
Abstract We analyze lightning initiation process using magnetic field waveforms of preliminary breakdown (PB) pulses observed at time scales a few tens microseconds by broad-band receiver. compare these with sources narrow-band very high frequency (VHF) radiation 60–66 MHz recorded two separate Lightning Mapping Arrays (LMAs). find that almost none the PB correspond to geo-located VHF sources, in agreement previous results and hypothesis processes generating are only weakly related. However,...
The common phenomenon of lightning still harbors many secrets and only recently a new propagation mode was observed for negative leaders. While propagating in this ``intensely radiating leader'' (IRNL) leader emits 100 times more very-high frequency (VHF) broadband radiation than normal leader. We have reported that occurs soon after initiation all flashes we mapped as well sometimes long thereafter. Because the profuse emission VHF structure is very difficult to image. In work report on...
Abstract This paper reports an observational study of lightning initial breakdown pulses (IBPs) using the low‐frequency array radio telescope and a broadband magnetic field sensor. The data show that overall spatiotemporal evolution electrical causing IBP is rather complex. During IBP, spatially temporally separated bursts very high frequency (VHF) electromagnetic radiation occur in volume on order 100 3 m , they are coincident with brief pulses, indicating location active region can change...
Abstract The presence of the plasmaspheric hiss emission around Earth has been known for more than 50 years, but its origin remained unknown in terms source location and mechanism. hiss, made whistler mode waves, exists most time plasmasphere is believed to control radiation belt surrounding which makes understanding very important. This paper presents direct observational evidence that originates equatorial region drainage plumes. It shows emissions propagate along magnetic field lines away...
Context. On December 27, 2020, Solar Orbiter completed its first gravity assist manoeuvre of Venus (VGAM1). While this flyby was performed to provide the spacecraft with sufficient velocity get closer Sun and observe poles from progressively higher inclinations, Radio Plasma Wave (RPW) consortium, along other operational in situ instruments, had opportunity perform high cadence measurements study plasma properties induced magnetosphere Venus. Aims. In paper, we review main observations RPW...