10 Years Bibliography

Ashot Chilingarian’s short scientific biography


Prof. Ashot Chilingarian was the director of A.Alikhanyan National laboratory (Yerevan Physics Institute, YerPhI) from 2008 to 2018.

Dr. Chilingarian earned his Ph.D. in 1984 and Doctorate of Science in Physics and Mathematics in 1991 from YerPhI. From 1971 to 1993 he was a scientist, senior scientist and data analysis group leader at the Yerevan Physics Institute. In 1993 Ashot Chilingarian became the deputy director of Yerevan Physics Institute, as well as head of the Cosmic Ray Division, in 2008 – director of the Yerevan Physics Institute.

His expertise is in the sphere of high-energy astroparticle physics, high-energy phenomena in the atmosphere, particle detector instrumentation and advanced statistical computation. His current interests include the galactic and solar cosmic ray origin and acceleration, atmospheric electricity and lightning phenomena, detection of secondary cosmic ray fluxes at the Earth’s surface, space weather and space climate.

In 80-ths A.Chilingarian developed methodology for multivariate data analysis for high-energy physics and astrophysics experiments. He is the author of the ANI (Analysis and Nonparametric Inference) computer code library, which has been extensively used during the last few decades for multidimensional analysis of data from modern cosmic ray detectors. He introduced the "multidimensional nonlinear cuts" method for analyzing data from the Atmospheric Cherenkov Telescopes (ACT); these techniques help to reliably proof existence of the flux of very high- energy gamma rays from the Crab nebula measured by the Whipple Cherenkov telescope thus establishing the new window to the Universe. The methodology of the event-by-event analysis of the Extensive Air Shower experiments, introduced by him allows the estimation of the energy spectra of the separate groups of primary nucleolus (only the all-particle spectrum was prior to that); the partial spectra of primary cosmic rays measured by MAKET-ANI and KASCADE detectors prove the mass-dependent position of the knee and helps to develop particle acceleration models in Supernovae explosions now confirmed by gamma ray observatories on board of AGILE and FERMI satellites. A.Chilingarian introduce a new probability distribution for calculation of chance probability for the “peak” detection in searches of “new physics”.  Using his criteria instead of “Gaussian” chance probabilities will help to avoid fake inference usually occurred when dealing with small statistics and applying multiple cuts. 


The main scientific results of A.Chilingarian are as follows:


  • Discovery of the features of Galactic Cosmic Ray spectra such as: the very sharp change of the power spectral index (~1) for the light nucleus group at 2-4 PeV and no pronounced change in the heavy nucleus group (at least for energies 20-30 PeV). Discovery of the charge depends “knee” in the energy spectra pointing to the shock acceleration initiated by the supernova blasts as a most probable mechanism of particle acceleration.
  • Discovery of energetic protons (with energies greater than 20 GeV) accelerated in the vicinity of the Sun on 20 January 2005 during Ground Level Enhancement (GLE) event N 69.
  • Discovery of simultaneous fluxes of electrons, gamma rays and neutrons measured at mountain altitudes, proving the existence of the new high-energy phenomenon (so called Thunderstorm Ground Enhancements - TGEs) in the thunderstorm atmospheres.
  • Discovery of the “Cloud extensive showers - CESs” – extended showers initiated in thunderclouds by the electrons accelerated in cloud electrical fields – first direct evidence of the Relativistic Runaway electron Avalanches (RREA) in the terrestrial atmosphere;
  • Development of the Aragats Space Environmental center (ASEC) and Armenian geophysics measurements network. Both are equipped with various particle detectors, field meters and meteorological stations for monitoring of ionization radiation, disturbances of geomagnetic and electric field and lightnings.
  • Founding of the worldwide network of new particle detectors for researches in space weather and solar physics, named SEVAN (Space Environment Viewing and Analysis Network). Nodes of the SEVAN network are now operating in Armenia, India, Bulgaria, Croatia and Slovakia;
  • Observations of numerous TGEs and their energy spectra on Aragats as well as detection on the millisecond time scales particle fluxes, lightning flashes and disturbances of the electrostatic field allows that lead to mechanism of lightning initiation (RB/TGE process).

Prof. Chilingarian has been lecturing at YSU near 40 years. He delivers courses on Neural Networks, Data Analysis, Introduction to High Energy Astrophysics, Models of Stochastic processes in Cosmic Ray Physics at the Applied Mathematics and Physics departments. Recently he established master courses in Experimental Physics at the Yerevan Physics Institute. He is also professor in the National Research Nuclear University MEPhI (Moscow Engineering Physics Institute). He delivered lectures on High-Energy physics in atmosphere. He was the supervisor of numerous undergraduate and graduate students’ theses. 10 PhD theses have been completed under his supervision. 

Prof. Chilingarian wins more than 20 Armenian and international research grants. The latest one is the Russian Science Foundation grant № 17-12-01439, „Comprehensive research of high-energy particles sources and powerful VHF radiation in electrically active atmosphere based on ground-based measurements and satellite observations, period 2017-2019“.

Outside his field, Prof. Chilingarian has been interested in applying his data analysis methods to pattern recognition and genome analysis. In 2000-2001 he collaborates with Huntsman cancer institute in Utah, USA to develop multivariate methods of DNA micro-array data treating based on quantification of different types of gene expression in normal and tumor-affected tissues. The work culminated in a patent application by Utah University. 

Prof. Chilingarian has authored ~350 scientific publications and served on many international scientific and editorial boards. He has been chairperson of several international conferences and given numerous presentations in the fields of high energy and cosmic ray physics and high-energy phenomena in the atmosphere.

Currently he is Armenia’s representative to the International Space Weather Initiative. He is the founder and spokesperson for the ANI and ASEC collaborations, and fellow of the American Physical Society, associate editor of the Space Weather and Space Climate (SWSC) and Advances in High Energy Physics journals.

Prof. Chilingarian wins World Summit on Information Society award (2003, Geneva) and Armenian President award in Physics (2013)

10 Years Bibliography

1.    Chilingarian; Statistical study of the detection of solar protons of highest energies at 20 January 2005, Advances in Space Research 43 (2009), pp. 702-707.

2.    Chilingaryan S., Chilingarian A., Danielyan V., et al; Advanced data acquisition system for SEVAN, Advances in Space Research 43 (2009) 717–720.

3.    Chilingarian A., G. Hovsepyan, K. Arakelyan, et al; Space Environmental Viewing and Analysis Network (SEVAN), Earth, Moon and Planets: Volume 104, Issue 1 (2009), page 195.

4.    Chilingarian A. and Bostanjyan N., Cosmic ray intensity increases detected by Aragats Space Environmental Center monitors during the 23rd solar activity cycle in correlation with geomagnetic storms, 2009, J. Geophys. Res., Vol. 114, No. A9, A09107

5.    Chilingarian and N. Bostanjyan; On the relation of the Forbush decreases detected by ASEC monitors during the 23rd solar activity cycle with ICME parameters, Advances in Space Research, Volume 45, Issue 5, 1 March 2010, Pages 614-621

6.    Mailyan, A. Chilingarian; Investigation of diurnal variations of cosmic ray fluxes measured with using ASEC and NMDB monitors, Advances in Space Research, 45, (2010) 1380–1387.

7.    Chilingaryan S., Beglarian A., Kopmann A., and Vo ̈cking S., J. Phys. Conf. Ser. 219, 042034 (2010).

8.    Chilingarian A., A. Daryan, K. Arakelyan, A. Hovhannisyan, B. Mailyan, L. Melkumyan, G. Hovsepyan; Ground-based observations of thunderstorm-correlated fluxes of high-energy electrons, gamma rays, and neutrons (2010), Phys Rev D. 82.043009

9.    Chilingarian A., Hovsepyan G., and Hovhannisyan A., Particle bursts from thunderclouds: Natural particle accelerators above our heads, Physical review D 83, 062001 (2011).

10.  Chilingarian A., Karapetyan T., Calculation of the barometric coefficients at the start of the 24th solar activity cycle for particle detectors of Aragats Space Environmental Center, Advances in Space Research 47 (2011) 1140–1146.

11.  Chilingarian A., Bostanjyan N., and Vanyan L., Neutron bursts associated with thunderstorms, Physical review d 85, 085017, 2012.


      12.  Chilingarian A., Bostanjyan N., Karapetyan T., Vanyan L., Remarks on recent results on neutron production during thunderstorms, Physical Review D 86, 093017 (2012).

      13.  Chilingarian, A. and Mkrtchyan, H., Role of the Lower Positive Charge Region (LPCR) in initiation of the Thunderstorm Ground Enhancements (TGEs), Physical Review D 86, 072003 (2012).

      14.  Chilingarian A., Mailyan B. and Vanyan L., Recovering of the energy spectra of electrons and gamma rays coming from the thunderclouds, Atmospheric Research 114–115 ,1–16, (2012).

     15.  Chilingarian A., Mailyan B., Recovering of the TGE electron and gamma ray energy spectra, Journal of Physics: Conference Series 409 (2013) 012214.

     16.  A Chilingarian, N Bostanjyan, T Karapetyan, On the possibility of location of radiation-emitting region in thundercloud, Journal of Physics: Conference Series 409 (2013) 012217.

     17.  Avakyan K., Arakelyan K., Chilingarian A., et al., NaI Detector Network at Aragats, Journal of Physics: Conference Series 409 (2013) 012218.

     18.  Chilingarian A., Bostanjyan N., Karapetyan T.,Vanyan L., Neutron production during thunderstorms, Journal of Physics: Conference Series 409 (2013) 012216.

     19.  Chilingarian A., Thunderstorm Ground Enhancements (TGEs) - New High- Energy Phenomenon Originated in the Terrestrial Atmosphere, Journal of Physics: Conference Series 409 (2013) 012019 .


     20.  Chilingarian A., Hovsepyan G., Extensive Cloud Showers (ECS) – New High-Energy Phenomena Resulting from the Thunderstorm Atmospheres , Journal of Physics: Conference Series 409 (2013) 012221.

     21.  Chilingarian A., Vanyan L., Simulations of the secondary cosmic ray propagation in the thunderstorm atmospheres resulting in the Thunderstorm ground enhancements (TGEs), Journal of Physics: Conference Series 409 (2013) 012215.


    22.  Chilingarian A. and Mkrtchyan H., Lower positive charge region (LPCR) and its influence on initiation of Thunderstorm ground enhancements (TGEs) and cloud-to-ground (CG-) and intracloud (IC-) lightning occurrences, Journal of Physics: Conference Series 409 (2013) 012219

    23.  Chilingarian A., Karapetan T., Melkumyan L., Statistical analysis of the Thunderstorm Ground Enhancements (TGEs) detected on Mt. Aragats. J. Adv. Space Res., 52, 1178  (2013),

    24.  Chilingarian A., Mailyan B., Vanyan L., Observation of Thunderstorm Ground Enhancements with intense fluxes of high-energy electrons, Astropart. Phys., 48, 1  (2013).  

    25.  Chilingarian A., Hovsepyan G., and Kozliner L., Thunderstorm ground enhancements: Gamma ray differential energy spectra, Physical Review D 88, 073001 (2013).

    26.  Chilingarian, A., Exploring High-Energy Phenomena in Earth's Atmosphere, Eos Trans. AGU, 94(50), 488 (2013).

    27.  Chilingarian A., Thunderstorm Ground Enhancements - model and relation to lightning flashes, Journal of Atmospheric and Solar-Terrestrial Physics, 107, 68-76, 2014.


    28.  Chilingarian A., Hovsepyan G., Vanyan L., On the origin of the particle fluxes from the thunderclouds: energy spectra analysis, EPL, 106 (2014) 59001


    29.  Chilingarian A., Exploring the Origin of High-Energy Particle Beams in the Atmosphere, Eos, Vol. 95, No. 46, 18 November 2014


    30.  Chilingarian A., Chilingaryan S., Hovsepyan G., Calibration of particle detectors for secondary cosmic rays using gamma-ray beams from thunderclouds, Astroparticle Physics 69 (2015) 37–43

          31.  Chilingarian A., Hovsepyan G., Khanikyanc Y., Reymers A. and Soghomonyan S., Lightning origination and thunderstorm ground enhancements terminated by the lightning flash, EPL, 110 (2015) 49001

          32.  Chilingarian, A., Chilingaryan S., and Reymers A., Atmospheric discharges and particle fluxes,
 J. Geophys. Res. Space Physics, 12058455853 (2015),doi:10.1002/2015JA021259.

          33.  Chilingarian A., Hovsepyan G., and Mantasakanyan E., Mount Aragats as a stable electron accelerator for atmospheric High-energy physics research, Phys. Rev. D: Part. Fields, 93, 052006 (2016).

   34.  Chilingarian, A. Where does lightning come from?, Eos, 97 (2016), doi:10.1029/2016EO050097. 


   35.  Chilingarian A., Hovsepyan G., Kozliner L., Extensive Air Showers, Lightning, and Thunderstorm Ground Enhancements, Astroparticle Physics 82 (2016) 21–35.


   36.  Chilingarian, A. (TEPA 2016), Conference report “Thunderstorms and Elementary Particle Acceleration (TEPA-2016)”, Newsletter on Atmospheric Electricity Vol. 27·No 2·Nov 2016


   37.  Chilingarian A., Comments on the models based on the concept of runaway electrons for explaining high-energy phenomena in the terrestrial atmosphere, Izvestiya Rossiiskoi Akademii Nauk, Seriya Fizicheskaya, 2017, Vol. 81, No. 2, pp. 254–257, © Allerton Press, Inc., 2017.


   38.  Chilingarian A., Do relativistic elementary particles originate in the lightning discharges? Izvestiya Rossiiskoi Akademii Nauk, Seriya Fizicheskaya, 2017, Vol. 81, No. 2, pp. 258–261.

   39.  Chilingarian A., Chilingaryan S., Karapetyan T., et al., 2017, On the initiation of lightning in thunderclouds, Scientific Reports 7, Article number: 1371, DOI:10.1038/s41598-017-01288-0.

   40.  Chilingarian, A., Y. Khanikyants,
E. Mareev, D. Pokhsraryan, V. A. Rakov, and S. Soghomonyan, 2017, Types of lightning discharges that abruptly terminate enhanced fluxes of energetic radiation and particles observed at ground level, J. Geophys. Res. Atmos., 12275827599

   41.  Chilingarian A., Hovsepyan G., Mailyan B., 2017, In situ measurements of the Runaway Breakdown (RB) on Aragats mountain, Nuclear Inst. and Methods in Physics Research, A 874,19–27.

   42.  A. Chilingarian, V. Babayan, T. Karapetyan, et al., The SEVAN Worldwide network of particle detectors: 10 years of operation, Advances in Space Research 61 (2018) 2680–2696.

   43.  A. Chilingarian, Long lasting low energy thunderstorm ground enhancements and possible Rn-222 daughter isotopes contamination, Physical review D 98, 022007 (2018).

   44.  Chilingarian, A. A. (2018), High-energy processes in Earth’s atmosphere and lightning, Eos, 99, https://doi.org/10.1029/2018EO100941. Published on 09 July 2018.

   45.  A.Chilingarian, G. Hovsepyan, S. Soghomonyan, M. Zazyan, and M. Zelenyy, Structures of the intracloud electric field supporting origin of long-lasting thunderstorm ground enhancements, Physical review 98, 082001(2018).

   46.  A.Chilingarian , S. Soghomonyan , Y. Khanikyanc , D. Pokhsraryan , On the origin of particle fluxes from thunderclouds, Astroparticle Physics 105 , 54(2019).


   47.  A.Chilingarian, Energetic radiation from thunderclouds: extended particle fluxes directed to Earth’s surface, Rendiconti Lincei. Scienze Fisiche e Naturali, doi.org/10.1007/s12210-018-0755-y, 2019.


   48.  A.Chilingarian, J.Knapp and M.Zazyan, Monitoring of the atmospheric electric field and cosmic-ray flux for the interpretation of results in high-energy astroparticle physics experiments, EPJ Web Conf., Volume 197, 2019, Atmospheric Monitoring for High-Energy  Astroparticle Detectors (AtmoHEAD-2018), Article 03001.


   49.  K.Apresyan, A.Chilingaryan, A.Ghalumyan, V. Ghazaryan, Upgrade of YerPhI polarization LIDAR System for Investigation of the Influence of Static Electric Fields on the Elastic and Raman Backscattered Beams Polarization, The European Physical Journal Conferences 197(6):03005, DOI: 10.1051/epjconf/201919703005


   50.  K.A.Nicoll, R.G.Harriso,V.Barta et al.,A global atmospheric electricity monitoring network for climate and geophysical research, JASTP, 184, 18 (2019).


    51.  A.Chilingarian, H. Mkrtchyan, G. Karapetyan, et al., Catalog of 2017 Thunderstorm Ground Enhancement (TGE) events observed on Aragats, Scientific Reports 9(1):6253, DOI: 10.1038/s41598-019-42786-7


   52.  A.Chilingarian, Reply to “Comment on ‘Long lasting low energy thunderstorm ground enhancements and possible Rn-222 daughter isotopes contamination, Phys. Rev. D 99, 108102 (2019)


   53.  A. Chilingarian, A. Avetisyan, G. Hovsepyan, T. Karapetyan, L. Kozliner, et al., Origin of the low-energy gamma ray flux of the long-lasting thunderstorm ground enhancements, Phys. Rev. D 99, 102002 (2019)


   54.  A. Chilingarian,  Y. Khanikyants, V. A. Rakov, and S. Soghomonyan, Termination of  thunderstorm-related bursts of energetic radiation and particles by inverted-polarity intracloud and hybrid lightning discharge Geophysical Research Letters, in press.