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
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.
|공지||<12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생||2016.11.28||1089965|
|80||<9/22(Thu.) 10:30> Bulk-boundary correspondence from the inter-cellular Zak phase||2016.08.29||75598|
|79||<10/13(Thu.) 13:00>기술융합을 통한 의료혁명과 물리학의 역할||2016.09.29||79654|
|78||<10/12(Wed.) 11:00am>Unconventional Superconductivity: From History to Mystery||2016.10.10||90390|
|77||<10/25(Tue.) 11:00am>Crystallization of Water under Modulating Pressures||2016.10.10||64169|
|»||<10/11(Tue.) 15:00>Analysis of Individual Terrestrial Gamma-ray Flashes||2016.10.10||74131|
|75||<10/25(Tue.) 11:00am>Crystallization of Water under Modulating Pressures||2016.10.14||64672|
|74||<12/2(Fri.) 14:00>Overview of HIMAC facility||2016.12.01||56305|
|73||<4/5(Wed.) 11:00am>Adhesion forces between nanoparticles in gas-phase processes and application||2017.04.03||111828|
|72||<4/5(Wed.) 18:00pm> 저에너지 가속기의 활용||2017.04.05||50082|
|71||<7/20(Thu.)14:00>Engineering and probing topological properties of Dirac semimetal films by asymmetric charge transfer||2017.07.18||127307|
|70||<7/24(Mon.)11:00>Antenna Arrays for Astroparticle Physics: Radio Detection of High-Energy Cosmic Rays||2017.07.19||122569|
|69||<8/21(Mon.)10:30>Non-Gaussianity as a Particle Detector||2017.08.17||69671|
|68||<8/30(Wed.)10:30>Technology convergence and applications of Large-Area Electronics, e-Textiles, bio-sensors and bio-electronics||2017.08.29||262438|
|67||<3/2(Fri.)11:00>Evolving magnetic interactions near a Kondo breakdown||2018.02.27||73105|
|66||<3/16(Fri.)11:00> Superlattice phonons of two dimensional heterostructures||2018.03.16||90857|
|65||<6/11(Mon.)3:30pm> Spontaneous Leptogenesis in Continuum-Clockwork Axion Models||2018.06.08||121945|
|64||<6/15(Fri.) ~ 16(Sat.)> Formation of first star and galaxy, Gravitational waves from Binary Mergers of Sub-Solar Mass Dark Black Holes||2018.06.12||75727|
|63||<6/21(Thu.) ~ 22(Fri.)>Mini-workshop for the entanglement entropy at SKKU||2018.06.18||55462|
|62||<7/11(Wed.) 3:00pm> Traversable wormholes: two-dimensional example||2018.07.09||55984|