The SEVAN Worldwide network of particle detectors: 10 years of operation

Chilingarian, A.; Babayan, V. Kh.; Karapetyan, T.; Mailyan, B.; Sargsyan, B.; Zazyan, M.

doi:10.1016/j.asr.2018.02.030

Cited by 28 publications

(9 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Estimates of this quantity vary widely. In the nuclear physics literature on TGEs, the free passage distance is often associated with the cloud base height Chilingarian, 2018aChilingarian, , 2018bChilingarian, Hovsepyan, Svechnikova, & Zazyan, 2021) which for the Aragats station (3.2 km MSL) is often 100m or less.…”

Section: Surface Detectability Of Energetic Electrons In Tgesmentioning

confidence: 99%

Radar Diagnosis of the Thundercloud Electron Accelerator

et al. 2022

Self Cite

View full text Add to dashboard Cite

Thunderstorm Ground Enhancements (TGEs) refer to correlated enhancements in surface electric field and gamma ray flux that are manifestations of electron runaway in the storm overhead. The electric field enhancements can be of positive or negative polarity. In this study, altitude‐resolved S‐band radar observations of graupel are used to demonstrate distinct differences in storm structure linked with these “positive” and “negative” TGEs. The physical interpretation rests on the well‐established temperature‐dependent tripole structure of thunderstorms, with the main negative charge of the tripole acting as an electron repeller. This interpretation is supported by case studies showing altitude‐stable convection, with shallow (deep) development linked with “positive” (“negative”) TGEs, and by case studies of collapsing storms that show upper dipole dominance early and lower inverted dipole dominance later when graupel particles descend from a colder to warmer temperature domain. In the case of many TGEs on Mt Aragats (3.2 km MSL), the temperature‐dependent altitude of downward electron acceleration and avalanching may be sufficiently distant (>500 m) from surface detectors that the energetic electrons (1–10 MeV) are not likely avalanche/runaway electrons. Instead, they are Compton‐scattered and pair‐produced electrons from bremsstrahlung gamma radiation emanating from the high‐field avalanche region aloft. These inferences are consistent with GEANT4 calculations that identify the physical origins of energetic electrons at the surface.

show abstract

Section: Surface Detectability Of Energetic Electrons In Tgesmentioning

confidence: 99%

Radar Diagnosis of the Thundercloud Electron Accelerator

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…Muons do not multiply in the electric field as electrons; however, electric fields lead to the modernization of their energy spectra and induce a very interesting muon stopping effect, used for the estimation of the maximum energy of the atmospheric electric field [16]. For the estimation of the maximum field, we use the observation of the ever-largest TGE measured at Lomnicky Stit in Slovakia ( [17] by SEVAN European particle detector network [18]).…”

Section: Discussionmentioning

confidence: 99%

The progress of High-Energy Physics in Atmosphere achieved with the implementation of particle physics and nuclear spectroscopy methods

Chilingarian¹

2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

View full text Add to dashboard Cite

At Aragats research station we are consistently applying methods of particle physics and nuclear spectroscopy for revealing details of the operation of electron accelerators evolving just above our heads in the thunderclouds. The newly emerging field of high-energy physics in the atmosphere (HEPA) needs successive application of experimentation paired with the simulation of physical processes with CORSIKA and GEANT4 packages well established in the high-energy physics community. In addition to the minute-long fluxes of high-energy electrons and gamma rays from relativistic runaway electron avalanches (RREA), we discover also the origin of hour-long isotropic fluxes of low-energy gamma rays from the 222 Rn progeny gamma radiation. During 12 years of 24/7 monitoring of cosmic ray fluxes, we observed more than half-of-thousand thunderstorm ground enhancements (TGEs). Each cosmic-ray species brings its own special evidence on the structure and strength of the atmospheric electric field. The depletion of muon flux (muon stopping effect) observed simultaneously with the world's largest-ever enhancement of electron and gamma rays' flux at Mt. Lomnicky Stit allows us to estimate the maximum value of the atmospheric electric field. Using a high-precision spectrometer for the measurement of the energy spectra of the natural gamma radiation we discovered a new effect of circulation of radon progeny during thunderstorms. The comparison of electron and gamma ray energy spectra allows us to identify the emerging electrical structures in the atmosphere which makes it possible to accelerate seed electrons from the ambient population of cosmic rays up to ≈100 MeV. Measuring simultaneously neutron and gamma ray fluxes by a neutron monitor and SEVAN hybrid particle detector we prove the photonuclear origin of the atmospheric neutrons.

show abstract

“…Cutoff rigidity of the NM at LS is 3.84 GV. The second is the SEVAN system, which has three separated plastic scintillators as detectors (Chilingarian et al, 2018). The upper and lower scintillators have the dimensions 100 × 100 × 5 cm and are separated from the middle scintillator by 4.5-cm-thick and 100 × 100 cm-wide lead absorbers.…”

Section: Measurement Setupmentioning

confidence: 99%

“…The middle detector is composed of five plastic slabs and has the dimensions 50 × 50 × 25 cm. The upper detector-channel 1-is mainly sensitive to low-energy charged particles, mainly electrons, and partly also to gamma rays (Chilingarian et al, 2018). The estimated energy threshold, considering the roof above the detector, is 7-8 MeV (Kudela et al, 2017).…”

Section: Measurement Setupmentioning

confidence: 99%

Influence of Solar Wind on Secondary Cosmic Rays and Atmospheric Electricity

Chum¹,

Kollárik²,

Kolmašová³

et al. 2021

Front. Earth Sci.

View full text Add to dashboard Cite

A relationship between the heliospheric magnetic field, atmospheric electric field, lightning activity, and secondary cosmic rays measured on the high mount of Lomnický Štít (2,634 m a.s.l.), Slovakia, during the declining phase of the solar cycle 24 is investigated with a focus on variations related to solar rotation (about 27 days). The secondary cosmic rays are detected using a neutron monitor and the detector system SEVAN, which distinguishes between different particles and energies. Using spectral analysis, we found distinct ∼27-day periodicities in variations of Bx and By components of the heliospheric magnetic field and in pressure-corrected measurements of secondary cosmic rays. The 27-day variations of secondary cosmic rays, on average, advanced and lagged the variations of Bx and By components by about 40° and −140°, respectively. Distinct 27-day periodicities were found both in the neutron monitor and the SEVAN upper and middle detector measurements. A nondominant periodicity of ∼27 days was also found for lightning activity. A cross-spectral analysis between fluctuation of the lightning activity and fluctuation of the heliospheric magnetic field (HMF) showed that fluctuation of the lightning activity was in phase and in antiphase with Bx and By components of the HMF, respectively, which is in agreement with previous studies investigating the influence of solar activity on lightning. On the other hand, the ∼27-day periodicity was not significant in the atmospheric electric field measured in Slovakia and Czechia. Therefore, no substantial influence of Bx and By on the atmospheric electric field was observed at these middle-latitude stations.

show abstract

The SEVAN Worldwide network of particle detectors: 10 years of operation

Cited by 28 publications

References 42 publications

Radar Diagnosis of the Thundercloud Electron Accelerator

Radar Diagnosis of the Thundercloud Electron Accelerator

The progress of High-Energy Physics in Atmosphere achieved with the implementation of particle physics and nuclear spectroscopy methods

Influence of Solar Wind on Secondary Cosmic Rays and Atmospheric Electricity

Contact Info

Product

Resources

About

The SEVAN Worldwide network of particle detectors: 10 years of operation

Cited by 28 publications

References 42 publications

Radar Diagnosis of the Thundercloud Electron Accelerator

Radar Diagnosis of the Thundercloud Electron Accelerator

The progress of High-Energy Physics in Atmosphere achieved with the implementation of particle physics and nuclear spectroscopy methods

Influence of Solar Wind on Secondary Cosmic Rays and Atmospheric Electricity

Contact Info

Product

Resources

About

The SEVAN Worldwide network of particle detectors: 10 years of operation