主持人：刘四明教授
时间：2022年12月16（周五）19：00
ZOOM：976 8788 7906
密码：123456
题目：A Review Study on the First GeV Particle Event of the Solar Cycle 25
主讲人：Kazi Md Abul Firoz 西南交通大学客座研究员
Highest Academic Achievement
2004-2008 PhD in Cosmic Rays & Space Weather, University of Pavol Jozef Šafárik,
Slovak Republic
Research Position Held
2009-2011 Korea Astronomy and Space Science Institute, South Korea
2011-2012 Worked at home while used RCMPS of Chittagong University as affiliation
2012-2013 Key Laboratory of Dark Matter & Space Astronomy, Purple Mountain
Observatory, CAS, China
2013-2015 Space Research Group, University of Alcalá, Alcalá de Henares, Spain
2016-2016 Key Laboratory of Dark Matter & Space Astronomy, Purple Mountain
Observatory, CAS, China
2017-2018 Space Weather Lab, Kyung Hee University, South Korea
2019-now Working at home using former institute as affiliation. Motivating students
online towards research
Areas of specialization
Solar & Space Weather – Solar Particle events, Solar Flares, CME Shocks and Solar
Radio bursts.
Award
2017 Razzaq-Shamsun Physics Award, Dhaka University, Bangladesh
Abstract
Ground level enhancement (GLE) is the extremely high-energy (GeV) particle event that appears as a sudden, sharp and short-lived increase in the solar cosmic ray temporal profile. There are 73 GLE events from 1942 to 2021. I will present a review study on the latest GLE event taken place on 28 October 2021 (hereafter GLE73), which is first GLE (GeV) of the solar cycle 25 (2019–2030). Following several papers that contained discussions on the GLE73-associated solar flare, coronal mass ejection (CME), shock and solar radio dynamic spectra, it is understood that the event was characterized by some usual and unusual occurrences. For instance, it is usual that a GLE is characterized by an anisotropic nature and harder spectrum while associated with an X-class flare (X1.0) and fast CME (~1240 km s-1). Conversely, it is not usual that it was originated from the location of central meridian (~W02 S26). However, the GLE73 seemed to have been produced from the flare acceleration process as the onset of the GLE73 appears very close to the onset of the soft X-ray fare component associated with type III radio burst. An analysis of solar radio dynamic spectra and radio flux density of low and high frequency interprets the particle acceleration processes (flare; CME shock).
