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Space Environmental Viewing and Analysis Network (SEVAN) Chilingarian 1, Ch.Angelov 2, K. Arakelyan 1, T.Arsov 2, Avakyan 1, S. Chilingaryan 1,4, K. A.Hovhanissyan.

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Presentation on theme: "Space Environmental Viewing and Analysis Network (SEVAN) Chilingarian 1, Ch.Angelov 2, K. Arakelyan 1, T.Arsov 2, Avakyan 1, S. Chilingaryan 1,4, K. A.Hovhanissyan."— Presentation transcript:

1 Space Environmental Viewing and Analysis Network (SEVAN) Chilingarian 1, Ch.Angelov 2, K. Arakelyan 1, T.Arsov 2, Avakyan 1, S. Chilingaryan 1,4, K. A.Hovhanissyan 1, Chilingarian 1, Ch.Angelov 2, K. Arakelyan 1, T.Arsov 2, Avakyan 1, S. Chilingaryan 1,4, K. A.Hovhanissyan 1, G. Hovsepyan 1, D. Hržina 3, T.Hovhannisyan 1, D. Maričić 3, A.Nishev 2,D.Roša 3, J.Stamenov 2, S. Tserunyan, G. Hovsepyan 1, D. Hržina 3, T.Hovhannisyan 1, D. Maričić 3, A.Nishev 2,D.Roša 3, J.Stamenov 2, S. Tserunyan, A. Tchorbadjieff 2, I.Kalapov 2, T.Karapetyan 1, L.Kozliner 1, B.Mailyan 1, A. Reymers, I. Romštajn 3 A. Tchorbadjieff 2, I.Kalapov 2, T.Karapetyan 1, L.Kozliner 1, B.Mailyan 1, A. Reymers, I. Romštajn 3 1 Alikhanyan Physics Institute, Yerevan, Armenia, Alikhanyan Brothers 2, Yerevan 375036, Armenia, 2 Nuclear Physics Institute of the Bulgarian Academy of Science, 72 Tzarigradsko chaussee Blvd. 1784 Sofia, Bulgaria 3 Zagreb Astronomical Observatory, Opatička 22, 10000 Zagreb, Croatia 4 Institut fuer Prozessdatenverarbeitung und Elektronik, Forschungszentrum Karlsruhe, Hermann-von-Helmholtz- Platz 1, 76344 Eggenstein-Leopoldshafen, Germany

2 100 – traversal of the low energy charged particle (~<200MeV); 010 – traversal of the neutral particle; 111 & 101 – traversal of the high energy muon (~>250MeV); Construction of the SEVAN basic unit

3 Electronics for the SEVAN 8-channel Programmable Threshold Comparator and Counter Atmel Tiny Little AVR32 Board (NGW 100)

4 SEVAN home page: http://crd.yerphi.am/sevan

5 Starting of SEVANs in Bulgaria and Croatia

6 Selection of Secondary Cosmic Rays

7 Purity-Efficiency Diagram

8 4-layered SEVAN module

9 SEVAN Count Rates Aragats 3200 a.s.l. ArNM 18NM64 0.4ms SEVAN [100] SEVAN [010] SEVAN [111] Relative Error0.00680.00810.02180.0192 1/sqrt(N)0.00490.00780.02230.0194 YerPhI (1000m)NorAmberd (2000m)Aragats (3200m) Zagreb, Croatia (130m) Moussala, Bulgaria, (2925 m) Type of secondary particle Measured count rate Simulated count rate Measured count rate Simulated count rate Measured count rate Simulated count rate Measured Count rate Measured count rate Low energy charged particles (100) 8862±108720211593±1611022016581±130172026415±8417479±136 Neutral particles (010) 363±19359690±277952011±461584316±181115±38 High energy muon (111 & 101) 4337±6754774473±9955485534±6480513824±646315±78

10 Barometric coefficients, count rates and relative errors of SEVAN monitors Monitor Altitude (m) Rc (Gv) Barometric Coeff. %/mb Correlation Coefficient Count rate [min] Relative error Aragats SEVAN Low energy charged particles (Coincidence 100) 32007.1-0.5±0.0180.995153890.0070.0080 Aragats SEVAN High energy muons (Coincidence 111+ Coincidence 101) 32007.1-0.351±0.0380.9638680.0140.0161 Aragats SEVAN neutrons (Coincidence 010) 32007.1-0.511±0.0180.99519590.0190.0225 Nor Amberd SEVAN Low energy charged particles (Coincidence 100) 20007.1-0.281±0.0220.95759410.0130.0129 Nor Amberd SEVAN High energy muons (Coincidence 111+ Coincidence 101) 20007.1-0.242±0.0220.95219880.0260.0224 Nor Amberd SEVAN neutrons (Coincidence 010)20007.1-0.54±0.0700.8996740.0370.0385 Yerevan SEVAN Low energy charged particles (Coincidence 100) 10007.1-0.3±0.0140.98794460.0100.0102 SEVAN High energy muons (Coincidence 111+ Coincidence 101) 10007.1-0.149±0.0350.76547140.0150.0145 Yerevan SEVAN neutrons (Coincidence 010) 10007.1-0.4±0.0390.9434250.0480.0485

11 Simulated enhancements detected by the SEVAN basic unit Detector LayerSolar ProtonsSolar Neutrons Upper 5cm scintillator4.8σ2.6σ Middle 25 cm scintillator1.7σ6.4σ 5min simulated enhancements in the Upper and Middle layers of the SEVAN basic unit.

12 Spectral “knees” of SCR

13 Relativistic Runaway Electron Avalanches in thunderstorm atmosphere

14 Energy Spectra of RREA Electrons and Gamma - rays

15 How electrons can “runaway”? Friction on electrons in air at sea level. Shown as a function of electron energy. “Collisional" and “radiative" labels indicate dominant process for energy range in question. The dashed curve is the Bethe-Bloch equation. The axis on the right indicates the electric field strength required to produce a force on an electron equal to the frictional force. Brant Carlson’s PhD thesis

16 SEVAN response to electron and gamma fluxes at 19 September 2009

17 RBF Gammas and Electrons detected by SEVAN

18 Electron-photon cascade and lightings

19 SEVAN Advantages The hybrid particle detectors, measuring neutral and charged fluxes provide following advantages upon existing detector networks measuring single species of secondary CR: Enlarged statistical accuracy of measurements; Probe different populations of primary cosmic rays with rigidities from 7 GV up to 20-30 GV; Reconstruct SCR spectra and determine position of the spectral “knees”; Classify GLEs in “neutron” or “proton” initiated events; Estimate and analyze correlation matrices among different fluxes; Significantly enlarge the reliability of Space Weather alerts due to detection of 3 particle fluxes instead of only one in existing neutron monitor and muon telescope world-wide networks. Detection of electrons and gamma-quanta from showers generated by powerful natural accelerators operating during thunderstorms – research of RREA process

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