A5038475201- Lightning and Electromagnetic Phenomena
- Ionosphere and magnetosphere dynamics
- Astrophysics and Cosmic Phenomena
- Earthquake Detection and Analysis
- Solar and Space Plasma Dynamics
- Dark Matter and Cosmic Phenomena
- Fire effects on ecosystems
- Gamma-ray bursts and supernovae
- Seismic Waves and Analysis
- Meteorological Phenomena and Simulations
- Particle Detector Development and Performance
- Electrostatic Discharge in Electronics
- Atmospheric aerosols and clouds
- Nuclear Physics and Applications
- Geophysics and Gravity Measurements
- Astro and Planetary Science
- Scientific Research and Discoveries
- Atmospheric Ozone and Climate
- High voltage insulation and dielectric phenomena
- Radiation Therapy and Dosimetry
- Radioactive Decay and Measurement Techniques
- Precipitation Measurement and Analysis
- Electromagnetic Compatibility and Noise Suppression
- Calibration and Measurement Techniques
- Electromagnetic Compatibility and Measurements
A. Alikhanyan National Laboratory
2015-2024
National Research University Higher School of Economics
2022
Purdue University West Lafayette
2017
Moscow State University
2017
Lomonosov Moscow State University
2017
University of Oregon
2017
National Academy of Sciences of Armenia
2009
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
2007
The Aragats Space Environmental Center facilities continuously measure fluxes of neutral and charged secondary cosmic ray incidents on the Earth's surface. Since 2003 in 1-minute time series we have detected more than 100 enhancements electron, gamma ray, neutron correlated with thunderstorm activities. During periods count rate enhancements, lasting tens minutes, millions additional particles were detected. Based largest particle event September 19, 2009, show that our measurements support...
Strong electrical fields inside thunderclouds give rise to fluxes of high-energy electrons and, consequently, gamma rays and neutrons. Gamma are currently detected by the facilities low orbiting satellites networks surface particle detectors. During intensive fluxes, coinciding with thunderstorms, series bursts were detectors Aragats Space Environmental Center at an altitude 3250 m. We classify thunderstorm ground enhancements in 2 categories, one lasting microseconds, other tens minutes....
The relationship of lightning and elementary particle fluxes in the thunderclouds is not fully understood to date. Using beams (the so-called Thunderstorm Ground Enhancements - TGEs) as a probe we investigate characteristics interrelated atmospheric processes. well-known effect TGE dynamics abrupt termination flux by flash. With new precise electronics, can see that decline occurred simultaneously with rearranging charge centers cloud. analysis energy spectra before after demonstrates...
The problem of thundercloud electrification is one the most difficult ones in atmospheric physics. structure electric fields clouds escapes from detailed situ measurements; few balloon flights reveal these rather complicated structures. To gain insight into charge a thundercloud, we use new key evidence---the fluxes particles so-called thunderstorm ground enhancements---TGEs. TGEs originate electron acceleration and multiplication processes strong intensity energy spectra electrons gamma...
Proceeding from the measurements of lightning occurrences, slow and fast electric-field disturbances, particle flux enhancements their abrupt terminations, we formulate a origination model. Registration extensive air shower simultaneously with detection allows us to propose solution long-standing problem its role in initiation. Our analysis is based on numerous Thunderstorm Ground Enhancements detected 2012–2014 at Mt. Aragats Armenia.
After having published the first thunderstorm ground enhancements (TGEs) catalog to explain long-lasting TGEs, we address here problems pertaining TGE evolution (shape) and atmospheric conditions supporting origination of relativistic runaway electron avalanches. We also question radon progeny gamma radiation its contribution overall flux. demonstrate that by using detectors with different energy thresholds can identify reliably separate both mechanisms origination. An analysis measured...
Particle detectors of the European Space Environment Viewing and Analysis Network (SEVAN) network located on mountain peaks in Aragats (Armenia), Lomnicky Stit (Slovakia), Musala (Bulgaria) are well suited for detection thunderstorm ground enhancements (TGEs). The modulation charged particle flux by electric field thundercloud results a sizable change count rate detectors, which measure fluxes electrons, gamma rays, high-energy muons. relation between electric-field strength changes...
We present a survey of more than half-thousand thunderstorm ground enhancements (TGEs, fluxes electrons, and gamma rays associated with thunderstorms) registered in 2008--2022 at Aragats space environmental center (ASEC). analyze correlations between various measured parameters characterizing TGEs on Aragats. Two special cases TGE events are considered: one, terminated by nearby lightning flashes, another one---with sufficiently large ratio electrons to rays. On the basis analysis, we...
Abstract Aragats solar neutron telescope (ASNT) is a unique instrument allowing to measure the energy spectra of electrons accelerated and multiplied in strong electric fields atmosphere. We describe setup, its operation condition, software, hardware triggers. present very large thunderstorm ground enhancement (TGE) event observed on 6 October 2021. The detector response function, algorithm recover from release histograms also are presented. recovery procedure verified by simulation function...
The authors present a model for the enhanced fluxes of electrons and gamma rays correlated with thunderstorms direct evidence relativistic runaway electron avalanches developed in terrestrial thunderous atmosphere.
The shape and evolution of the energy spectra thunderstorm ground enhancement (TGE) electrons gamma rays shed light on origin TGEs, relationship modification (MOS) relativistic runaway electron avalanche processes, nature seed particles, strength elongation an atmospheric electric field. However, till now measurements TGE have been rather scarce. For first time, we present differential in wide range 4--100 MeV for five events detected 2012--2013 at Aragats. We use special technique...
Simultaneous measurements of the gamma ray differential energy spectra, electric field disturbances, and meteorological conditions provided by experimental facilities located at Mt. Aragats in Armenia allows to establish model particle acceleration propagation thunderstorm atmosphere. We present comparisons measured modeled ground enhancements (TGEs). The origin majority TGEs is MOS process —the modification spectra cosmic electrons atmospheric fields. are well described power law function...
In this letter, we present for the first time method to get insight into charge structure of thundercloud using simultaneously measured electron and gamma ray spectra thunderstorm ground enhancement (TGE). We discuss compare two main scenarios that can support initiation relativistic runaway avalanches (RREA) in thundercloud. One includes emergence lower positive charged layer (LPCR). The LPCR is a shortliving sitting on hydrometeors, which exhibit accidental reversals depending temperature...
Proceeding from a stormy day on 22 September 2022, when seven thunderstorm ground enhancements occurred (TGEs, three of them very large), we analyze closely the TGEs' energy spectra and conditions supporting unleashing intense particle flux. For first time, present detailed analysis shape TGE in range 0.3 to 50 MeV discuss origination. The cross calibration different detectors is possible thanks $24/7$ monitoring fluxes with numerous spectrometers operated Aragats cosmic ray observatory....
Observation of the numerous thunderstorm ground enhancements (TGEs), i.e., enhanced fluxes electrons, gamma rays, and neutrons detected by particle detectors located on Earth's surface related to strong thunderstorms above it, helped establish a new scientific topic---high-energy physics in atmosphere. Relativistic runaway electron avalanches (RREAs) are believed be central engine initiating high-energy processes atmospheres. RREAs observed Mount Aragats Armenia during strongest simultaneous...
Abstract We describe a new phenomenon in atmospheric physics— 222 Rn progeny circulation during thunderstorms. The enhancement of the natural gamma radiation thunderstorms was measured with precise ray spectrometers. Results measurements performed at Aragats mountain Armenia summer 2020 demonstrate lifted to atmosphere by near‐surface electric field are returned backward ground rain precipitation. Thus, not only return negative charge Earth lightning flashes but also maintain atmosphere; it...
Abstract E. Williams et al. (2022, commented paper) questioned electron energy spectra derived from thunderstorm ground enhancements (TGEs) measured on Aragats; they concluded that “A more likely origin for any detected electrons at 3.2 km above sea level is Compton scattering and pair production activated by longer‐range bremsstrahlung gamma rays, themselves produced runaway encounters with nuclei in the breakeven field higher altitude.” In this comment, we show selection criteria of...