logo

korean english

게시판

Home > 게시판 > 세미나

일시: 10월 11일(화) 오후 3:00

장소: 기초과학연구소 세미나실 (제1과학관 3층 31317호)

○ 연사: Dr. Bagrat Mailyan (University of Alabama, USA)  

Title: Analysis of Individual Terrestrial Gamma-ray Flashes


○ Abstract: 

We report on the spectral analysis of individual Terrestrial Gamma-ray Flashes (TGFs) observed with the Fermi Gamma-ray Burst Monitor (GBM). 
The large GBM TGF sample provides 46 events suitable for individual spectral analysis: sufficiently bright, localized by ground-based radio, and with the gamma rays reaching a detector unobstructed. These TGFs exhibit diverse spectral characteristics that are hidden when using summed analysis methods. We account for the low counts in individual TGFs by using Poisson likelihood, and we also consider instrumental effects. 
The data are fit with models obtained from Monte Carlo simulations of the large scale Relativistic Runaway Electron Avalanche (RREA) model, including propagation through the atmosphere. Source altitudes ranging from 11.6 to 20.2 km are simulated. Two beaming geometries were considered: In one, the photons retain the intrinsic distribution from scattering (narrow), and in the other, the photons are smeared into a wider beam (wide). 
Several TGFs are well fit only by narrow models, while others favor wide models. Large-scale RREA models can accommodate both narrow and wide beams, with narrow beams suggest large-scale RREA in organized electric fields while wide beams may imply converging or diverging electric fields. 
Wide beams are also consistent with acceleration in the electric fields of lightning leaders, but the TGFs that favor narrow beam models appear inconsistent with some lightning leader models.



번호 제목 날짜 조회 수
공지 2022학년도 1학기 콜로퀴움 일정 2022.01.10 2269
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 813569
488 <10/25(Tue.) 11:00am>Crystallization of Water under Modulating Pressures 2016.10.14 50183
487 <Oct. 19(Wed.) 10:00 AM> Hyper-Kamiokande project -The future of neutrino physics in Japan 2016.10.12 53797
» <10/11(Tue.) 15:00>Analysis of Individual Terrestrial Gamma-ray Flashes 2016.10.10 52871
485 <10/25(Tue.) 11:00am>Crystallization of Water under Modulating Pressures 2016.10.10 49299
484 <10/12(Wed.) 11:00am>Unconventional Superconductivity: From History to Mystery 2016.10.10 67338
483 <Oct. 12(Wed.) 4:30 PM> Silk as a biocompatible optical material 2016.10.05 56113
482 <10/13(Thu.) 13:00>기술융합을 통한 의료혁명과 물리학의 역할 2016.09.29 47168
481 <Oct. 5(Wed.) 4:30 PM> 국제원자력기구 (IAEA)와 핵데이터 2016.09.22 52158
480 <Sep. 21(Wed.) 4:30 PM>광자질량의 물리학 2016.09.19 51713
479 <Sep. 7(Wed.) 4:30 PM>Manipulating spins in topological insulators 2016.09.02 61563
478 <9/22(Thu.) 10:30> Bulk-boundary correspondence from the inter-cellular Zak phase 2016.08.29 52676
477 2016학년도 2학기 콜로퀴움 일정 2016.08.02 89176
476 <8/5(Fri.) 10:30> Phase Slips in Superfluid Spin Transport in Magnetic Wires 2016.08.02 48934
475 <7/18(Mon.) 14:00> GEANT4 Particle Physics Simulation Software: A Brief Overview From a User’s Perspective 2016.07.15 49230
474 <7/15(Fri.) 11:00> Observation of a field induced quantum spin liquid in α-RuCl3 2016.07.14 53448
473 <7/15(Fri.) 14:00> Electronic quasiparticles in the quantum dimer model 2016.07.12 54018
472 <7/12(Tue.) 11:00> Spin-direction-dependent magnetoelastic coupling on MnO, CoO, and NiO file 2016.07.01 54476
471 <6/24(Fri.) 1:30pm>Emergent geometry from field theory: Wilson's renormalization group revisited 2016.06.20 51871
470 <June 8(Wed.) 4:30 PM> 세계와 우리나라 우주개발 도전 2016.06.01 49680
469 <June 1(Wed.) 4:30 PM> 중력으로 강한 핵력 이해하기 2016.05.26 49395