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||1078680|
|204||<Oct. 5(Wed.) 4:30 PM> 국제원자력기구 (IAEA)와 핵데이터||2016.09.22||62670|
|203||<10/13(Thu.) 13:00>기술융합을 통한 의료혁명과 물리학의 역할||2016.09.29||77708|
|202||<Oct. 12(Wed.) 4:30 PM> Silk as a biocompatible optical material||2016.10.05||65764|
|201||<10/12(Wed.) 11:00am>Unconventional Superconductivity: From History to Mystery||2016.10.10||87507|
|200||<10/25(Tue.) 11:00am>Crystallization of Water under Modulating Pressures||2016.10.10||62718|
|»||<10/11(Tue.) 15:00>Analysis of Individual Terrestrial Gamma-ray Flashes||2016.10.10||71631|
|198||<Oct. 19(Wed.) 10:00 AM> Hyper-Kamiokande project -The future of neutrino physics in Japan||2016.10.12||62776|
|197||<10/25(Tue.) 11:00am>Crystallization of Water under Modulating Pressures||2016.10.14||62603|
|196||<Nov. 2(Wed.) 4:30 PM> 현대 우주론 이론과 관찰 (Theories and observations of modern cosmology)||2016.10.19||55525|
|195||<Nov. 9(Wed.) 4:30 PM> 20-nm resolution imaging of brain circuitry by next-generation expansion microscopy||2016.11.02||54290|
|194||<Nov. 16(Wed.) 4:30 PM> Two-dimensional Chiral Materials and Topological Insulators||2016.11.10||200752|
|193||<Nov. 23(Wed.) 4:30 PM> Dry (Plasma) etch process in Semiconductor Device||2016.11.16||62176|
|192||<Nov. 30(Wed.) 4:30 PM> Chiral solitons for topological informatics||2016.11.23||81248|
|191||<Dec. 7(Wed.) 4:30 PM>Mechanotransduction of cells in vitro(세포기능의 역학적 조절)||2016.11.30||82234|
|190||<12/2(Fri.) 14:00>Overview of HIMAC facility||2016.12.01||55503|
|189||<Dec. 14(Wed.) 4:30 PM>중력과 양자 얽힘 (tentative)||2016.12.07||54324|
|188||2017학년도 1학기 콜로퀴움 일정||2017.01.05||305508|
|187||<Mar. 15(Wed.) 4:30 PM>반도체 Fab Process와 물리학 전공자||2017.03.14||54266|
|186||<Mar. 22(Wed.) 4:30 PM>Symmetry and topology in the electronic structure of solids||2017.03.15||56591|