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  1. AU="Chilingarian, A"
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  1. Article ; Online: The causes of the abrupt enhancement of the natural gamma radiation in the thunderous atmosphere on the mountain tops.

    Chilingarian, A / Sargsyan, B

    Journal of environmental radioactivity

    2024  Volume 274, Page(s) 107409

    Abstract: The study presented the relationship between sudden Natural Gamma Radiation (NGR) increases related to enhanced atmospheric electric fields. We pinpoint Thunderstorm Ground Enhancements (TGEs) as the primary source of abrupt and significant NGR spikes. ... ...

    Abstract The study presented the relationship between sudden Natural Gamma Radiation (NGR) increases related to enhanced atmospheric electric fields. We pinpoint Thunderstorm Ground Enhancements (TGEs) as the primary source of abrupt and significant NGR spikes. These TGEs, which are transient, several-minute-long increases in elementary particle fluxes, originate from natural electron accelerators within thunderclouds. The more prolonged, yet less pronounced, increases in NGR, persisting for several hours, are attributed to the gamma radiation from radon progeny and enhanced positron fluxes. This radon, emanating from terrestrial materials, is carried aloft by the Near-Surface Electric Field (NSEF). To measure NGR at Aragats Mountain, we use an ORTEC detector and custom-built large NaI (Tl) spectrometers, employing lead filters to discriminate between cosmic ray fluxes and radon progeny radiation. Our analysis differentiates between radiation enhancements during positive and negative NSEF episodes. The resultant data provide a comprehensive measurement of the intensities of principal isotopes and positron flux during thunderstorms compared to fair weather conditions.
    MeSH term(s) Radon Daughters/analysis ; Gamma Rays ; Radiation Monitoring ; Radon/analysis ; Atmosphere
    Chemical Substances Radon Daughters ; Radon (Q74S4N8N1G)
    Language English
    Publishing date 2024-03-01
    Publishing country England
    Document type Journal Article
    ZDB-ID 1483112-0
    ISSN 1879-1700 ; 0265-931X
    ISSN (online) 1879-1700
    ISSN 0265-931X
    DOI 10.1016/j.jenvrad.2024.107409
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  2. Article ; Online: Comment on "Measurement of the Electrical Properties of a Thundercloud through Muon Imaging by the GRAPES-3 Experiment".

    Chilingarian, A / Hovsepyan, G / Svechnikova, E / Mareev, E

    Physical review letters

    2020  Volume 124, Issue 1, Page(s) 19501

    Language English
    Publishing date 2020-01-24
    Publishing country United States
    Document type Journal Article ; Comment
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.124.019501
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

    Z 4' 58/153: Show issues

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  3. Article: Termination of thunderstorm-related bursts of energetic radiation and particles by inverted intracloud and hybrid lightning discharges

    Chilingarian, A / Khanikyants, Y / Rakov, V.A / Soghomonyan, S

    Elsevier B.V. Atmospheric research. 2020 Mar. 01, v. 233

    2020  

    Abstract: Recent studies of thunderstorm-related enhancements of fluxes of energetic radiation and particles at ground level suggest that removal of mid-level negative charge from the cloud by negative cloud-to-ground (-CG) lightning flashes or normal intracloud ( ... ...

    Abstract Recent studies of thunderstorm-related enhancements of fluxes of energetic radiation and particles at ground level suggest that removal of mid-level negative charge from the cloud by negative cloud-to-ground (-CG) lightning flashes or normal intracloud (IC) flashes serves to abruptly terminate those enhancements. However, it was not clear if the electron-accelerating electric field responsible for flux enhancements at ground was primarily between the main negative charge region and ground (produced due to the dominant effect of negative cloud charge) or between the mid-level negative and lower positive charge regions inside the thundercloud. Here, we report that these flux enhancements can be also abruptly terminated by inverted intracloud flashes and hybrid lightning flashes (inverted IC followed by negative CG). Based on the analysis of 13 events of these two types, we provide first evidence that the electric field between the mid-level negative and lower positive charge regions in the thundercloud can be responsible for the flux enhancements at ground level.
    Keywords cloud cover ; electric field ; lightning ; storms
    Language English
    Dates of publication 2020-0301
    Publishing place Elsevier B.V.
    Document type Article
    ISSN 0169-8095
    DOI 10.1016/j.atmosres.2019.104713
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  4. Article ; Online: Catalog of 2017 Thunderstorm Ground Enhancement (TGE) events observed on Aragats.

    Chilingarian, A / Mkrtchyan, H / Karapetyan, G / Chilingaryan, S / Sargsyan, B / Arestakesyan, A

    Scientific reports

    2019  Volume 9, Issue 1, Page(s) 6253

    Abstract: The natural electron accelerator in the clouds above Aragats high-altitude research station in Armenia operates continuously in 2017 providing more than 100 Thunderstorm Ground enhancements (TGEs). Most important discovery based on analysis of 2017 data ... ...

    Abstract The natural electron accelerator in the clouds above Aragats high-altitude research station in Armenia operates continuously in 2017 providing more than 100 Thunderstorm Ground enhancements (TGEs). Most important discovery based on analysis of 2017 data is observation and detailed description of the long-lasting TGEs. We present TGE catalog for 2 broad classes according to presence or absence of the high-energy particles. In the catalog was summarized several key parameters of the TGEs and related meteorological and atmospheric discharge observations. The statistical analysis of the data collected in tables reveals the months when TGEs are more frequent, the daytime when TGEs mostly occurred, the mean distance to lightning flash that terminates TGE and many other interesting relations. Separately was discussed the sharp count rate decline and following removal of high-energy particles from the TGE flux after a lightning flash. ADEI multivariate visualization and statistical analysis platform make analytical work on sophisticated problems rather easy; one can try and test many hypotheses very fast and come to a definite conclusion allowing crosscheck and validation.
    Language English
    Publishing date 2019-04-18
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-019-42786-7
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Recovering of the energy spectra of electrons and gamma rays coming from the thunderclouds

    Chilingarian, Ashot / Mailyan, Bagrat / Vanyan, Levon

    Atmospheric research. 2012 Oct. 1, v. 114-115

    2012  

    Abstract: Strong electric fields inside thunderclouds give rise to enhanced fluxes of high-energy electrons and, consequently, gamma rays and neutrons. During thunderstorms at Mount Aragats, hundreds of Thunderstorm Ground Enhancements (TGEs) comprising millions ... ...

    Abstract Strong electric fields inside thunderclouds give rise to enhanced fluxes of high-energy electrons and, consequently, gamma rays and neutrons. During thunderstorms at Mount Aragats, hundreds of Thunderstorm Ground Enhancements (TGEs) comprising millions of energetic electrons and gamma rays, as well as neutrons, were detected at Aragats Space Environmental Center (ASEC) on 3200m altitude. Observed large TGE events allow for the first time to measure the energy spectra of electrons and gamma rays well above the cosmic ray background. The energy spectra of the electrons have an exponential shape and extend up to 30–40MeV. Recovered energy spectra of the gamma rays are also exponential in energy range 5–10MeV, then turns to power law and extends up to 100MeV.
    Keywords altitude ; electric field ; electrons ; energy ; gamma radiation
    Language English
    Dates of publication 2012-1001
    Size p. 1-16.
    Publishing place Elsevier B.V.
    Document type Article
    ISSN 0169-8095
    DOI 10.1016/j.atmosres.2012.05.008
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  6. Book ; Conference proceedings: Proceedings of the Workshop ANI 99

    Chilingarian, A. A

    current topics of cosmic ray research with EAS observations ; Nor-Amberd Station of the Mt. Aragats Cosmic Ray Observatory, Armenia, May 29 - June 3, 1999

    (Wissenschaftliche Berichte / Forschungszentrum Karlsruhe, Technik und Umwelt ; FZKA 6472)

    2000  

    Institution Forschungszentrum Karlsruhe
    Event/congress Workshop ANI (1999.05.29-06.03, Armenia)
    Author's details Forschungszentrum Karlsruhe, Technik und Umwelt. Eds.: A. A. Chilingarian .̤
    Series title Wissenschaftliche Berichte / Forschungszentrum Karlsruhe, Technik und Umwelt ; FZKA 6472
    Language English
    Size IX, 139 S, Ill., graph. Darst
    Edition Als Ms. gedr
    Publisher FZKA
    Publishing place Karlsruhe
    Document type Book ; Conference proceedings
    Note Unterschiede zwischen dem gedruckten Dokument und der elektronischen Dokumentenversion können nicht ausgeschlossen werden. - Literaturangaben
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  7. Book ; Conference proceedings ; Online: Proceedings of the Workshop ANI 99

    Chilingarian, A. A

    current topics of cosmic ray research with EAS observations ; Nor-Amberd Station of the Mt. Aragats Cosmic Ray Observatory, Armenia, May 29 - June 3, 1999

    (Wissenschaftliche Berichte / Forschungszentrum Karlsruhe, Technik und Umwelt ; FZKA 6472)

    2000  

    Institution Forschungszentrum Karlsruhe
    Event/congress Workshop ANI (1999.05.29-06.03, Armenia)
    Author's details Forschungszentrum Karlsruhe, Technik und Umwelt. Eds.: A. A. Chilingarian .̤
    Series title Wissenschaftliche Berichte / Forschungszentrum Karlsruhe, Technik und Umwelt ; FZKA 6472
    Language English
    Size Online-Ressource, Ill., graphics
    Edition [Elektronische Ressource]
    Publisher Universitätsbibliothek u. Technische Informationsbibliothek ; FZKA
    Publishing place Hannover ; Karlsruhe
    Document type Book ; Conference proceedings ; Online
    Note Differences between the printed and electronic version of the document are possible. - nIndex
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  8. Book ; Conference proceedings: Proceedings of the Workshop ANI 98

    Chilingarian, A. A

    current topics of cosmic ray research with EAS observations ; Nor-Ambered Station of the Mt. Aragats Cosmic Ray Observatory, Armenia, May 29 - June 5, 1998

    (Wissenschaftliche Berichte / Forschungszentrum Karlsruhe, Technik und Umwelt ; FZKA 6215)

    1998  

    Institution Forschungszentrum Karlsruhe
    Event/congress Workshop ANI (1998.05.29-06.05, YerevanArmenia)
    Author's details Forschungszentrum Karlsruhe, Technik und Umwelt. Eds.: A. A. Chilingarian
    Series title Wissenschaftliche Berichte / Forschungszentrum Karlsruhe, Technik und Umwelt ; FZKA 6215
    Language English
    Size X, 132 S, Ill., graph. Darst
    Edition Als Ms. gedr
    Publisher FZKA
    Publishing place Karlsruhe
    Document type Book ; Conference proceedings
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  9. Article: [Right ventricular remodeling after myocardial infarctions of different location].

    Adamian, K G / Chilingarian, A L / Tumasian, L R

    Kardiologiia

    2010  Volume 50, Issue 3, Page(s) 16–21

    Abstract: Aim: To study dynamic dimensional and functional changes of both ventricles after myocardial infarctions (MI) of different locations.: Material and methods: Patients with first acute ST elevation MI (n=180) were distribution to 3 groups: anterior ( ... ...

    Abstract Aim: To study dynamic dimensional and functional changes of both ventricles after myocardial infarctions (MI) of different locations.
    Material and methods: Patients with first acute ST elevation MI (n=180) were distribution to 3 groups: anterior (AMI), inferior (IMI), and posterolateral (PLMI). EchoCG dimensional parameters of LV and RV as well as functional two dimensional EchoCG, flow and tissue doppler parameters were measured on days 7, 90 and after 1 year of follow up to reveal systolic or diastolic dysfunction of both chambers.
    Results: After 1 year of follow up significant LV remodeling with systolic and diastolic dysfunction was observed in AMI compared with IMI and PLMI. Pronounced RV remodeling was revealed in acute stage of IMI, compared with AMI and PLMI. Dynamic follow up showed reversed RV remodeling in IMI with relative restoration of systolic and diastolic parameters, and progressive RV remodeling in AMI with significant systolic and diastolic dysfunction compared with IMI and PLMI.
    Conclusion: Thus, dynamic structural and functional changes occurr in both ventricles and depend on Ml site, with most ventricular compromise in AMI due to asynergy of the septum, as common ventricular wall plays major role in RV performance.
    MeSH term(s) Echocardiography, Doppler ; Echocardiography, Transesophageal ; Electrocardiography ; Follow-Up Studies ; Heart Ventricles/diagnostic imaging ; Heart Ventricles/physiopathology ; Humans ; Middle Aged ; Myocardial Infarction/complications ; Myocardial Infarction/diagnosis ; Myocardial Infarction/physiopathology ; Prognosis ; Stroke Volume ; Ventricular Dysfunction, Right/diagnostic imaging ; Ventricular Dysfunction, Right/etiology ; Ventricular Dysfunction, Right/physiopathology ; Ventricular Remodeling/physiology
    Language Russian
    Publishing date 2010
    Publishing country Russia (Federation)
    Document type Comparative Study ; Journal Article
    ZDB-ID 131029-x
    ISSN 0022-9040
    ISSN 0022-9040
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    In stock of ZB MED Cologne/Königswinter

    Zs.B 972: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 2021: Bestellungen von Artikeln über das Online-Bestellformular
    ab Jg. 2022: Lesesaal (EG)

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  10. Article ; Online: On the initiation of lightning in thunderclouds.

    Chilingarian, Ashot / Chilingaryan, Suren / Karapetyan, Tigran / Kozliner, Lev / Khanikyants, Yeghia / Hovsepyan, Gagik / Pokhsraryan, David / Soghomonyan, Suren

    Scientific reports

    2017  Volume 7, Issue 1, Page(s) 1371

    Abstract: The relationship of lightning and elementary particle fluxes in the thunderclouds is not fully understood to date. Using the particle beams (the so-called Thunderstorm Ground Enhancements - TGEs) as a probe we investigate the characteristics of the ... ...

    Abstract The relationship of lightning and elementary particle fluxes in the thunderclouds is not fully understood to date. Using the particle beams (the so-called Thunderstorm Ground Enhancements - TGEs) as a probe we investigate the characteristics of the interrelated atmospheric processes. The well-known effect of the TGE dynamics is the abrupt termination of the particle flux by the lightning flash. With new precise electronics, we can see that particle flux decline occurred simultaneously with the rearranging of the charge centers in the cloud. The analysis of the TGE energy spectra before and after the lightning demonstrates that the high-energy part of the TGE energy spectra disappeared just after lightning. The decline of particle flux coincides on millisecond time scale with first atmospheric discharges and we can conclude that Relativistic Runaway Electron Avalanches (RREA) in the thundercloud assist initiation of the negative cloud to ground lightning. Thus, RREA can provide enough ionization to play a significant role in the unleashing of the lightning flash.
    Language English
    Publishing date 2017-05-02
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-017-01288-0
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