【直播】【北大空间物理系列讲座】台湾“中央”大学刘正彦教授 学术报告

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本次报告由北京大学空间物理与应用技术研究所主办，于2021年10月20日15:00开始，授权蔻享学术进行网络直播。

讲座信息

时间：周三（2021年10月20日）下午15:00

讲座嘉宾：刘正彦 教授

报告题目：Ionospheric ground-based and radio occultation GNSS Observation

讲座及嘉宾介绍

讲座摘要

The total electron contents (TECs) derived from ground-based GNSS (global navigation satellite system) receiving stations have been used to observe ionospheric signatures of solar eclipses, solar flares, magnetic storms, earthquake waves, tsunamis, etc.  On the other hand, GNSS radio occultation (RO) observations by 6 micro satellites of FORMOSAT-3/COSMIC (F3/C) in 2006-2020 and by 6 small satellites of FORMOSAT-7/COSMIC-2 (F7/C2) in 2019-present for the first time provide a good chance to uniformly, timely, and globally observe the ionospheric three-dimensional (3D) electron density structure from 100 to 600 km altitude.  Assimilating ground-based GNSS TEC and F3/C and/or F7/C2 RO data into existing empirical or physical models can be employed to construct monitoring (near real-time), nowcast (few minutes to hours), forecast (few hours to days), and S4 index scintillation models for studying/forecasting the accuracy of positioning and navigation, and quality of telecommunication.  Moreover, F3/C and F7/C2 ionospheric RO soundings also allow us examining the 3D electron density structure and related electrodynamics associated with the long-term trends of diurnal, seasonal, solar activity, and geographical location variations, especially in regions of the equatorial ionization anomaly, middle latitude trough, and Weddell/Okhotsk Sea Anomaly; as well as exploring new sciences, such as plasma caves, plasma depletion bays, tsunami traveling ionospheric disturbances, ionospheric storm fluctuations, and seismo-ionospheric precursors.

刘正彦 教授

个人简介

LIU, Jann-Yenq (Tiger) is a chair professor at Department of Space Science and Engineering, as well as Director of Center for Astronautical Physics and Engineering (CAPE), National Central University.  His research specialty is ionospheric radio, GNSS geoscience applications, ionospheric modeling, and lithosphere-atmosphere-ionospheric coupling. He received BS, Atmospheric Physics Department, National Central University in 1980, as well as MS and PhD, Physics Department, Utah State University in 1988 and 1990, respectively.  He was Associated Professor at Department of Space Science and Engineering, as well as Center for Space and Remote Sensing Research, National Central University during 1990-1997, and has been Professor since 1997.  His research areas are in ionospheric space weather (solar flare, solar eclipse, and magnetic storm signatures), ionospheric data assimilation, ionospheric radar science, space- (radio occultation, RO) and ground-based GNSS geosciences applications (ionospheric total electron content, TEC), seismo-traveling ionospheric disturbance (ionospheric tsunami signature), and seismo-ionospheric precursors.  He has been publishing more than 300 referred journal papers since 1988.  Based on the ionospheric GNSS observations, he has been promoting developments of ionospheric weather monitoring/nowcast/forecast models; finds several ionospheric new features, ionospheric plasma caves, ionospheric depletion bays, middle latitude electron density enhancement, ionospheric tsunami wave perturbations, and pre-earthquake ionospheric signatures; as well as investigates 3D electron density structures/dynamics of equatorial ionization anomaly, ionospheric tides, middle latitude trough, and Weddell Sea Anomaly.

空间物理系列讲座时间表

09.22

Generation processes of whistler-mode chorus and hiss emissions in the magnetosphere

Yoshiharu Omura | Kyoto University

09.29
Radio Techniques for Solar Physics and Space Weather 

颜毅华 | 国家天文台

10.13
Recent advances in understanding cosmic rays and their Relations to Earth’s radiation belt, contributions from our CubeSat missions and future plans

Xinlin Li | UC Bouler

10.20

>>Ionospheric ground-based and radio occultation: GNSS Observations

Tiger Liu | Taiwan Central University

10.27
等离子体相干辐射机制研究进展

陈耀 | 山东大学

11.03

木星十米波射电辐射源区的统计分析

汪毓明 | 中国科学技术大学

11.10

Evolution of auroral substorms as viewed from MHD simulation

Yusuke Ebihara | Kyoto University

11.17

Pc1/EMIC waves and associated isolated proton auroras observed near the plasmapause

Kazuo Shiokawa | Nagoya University

11.24

Basic features of Alfven waves: From MHD to wave-particle interaction

Dong-Huen Lee | Kyung Hee University

12.01

Connecting X-line heating efficiency to the reconnection rate problem

Yi-Hsin Liu | Dartmouth college

12.08

待定

L-C Lee | 台湾中央研究院 地球科学研究所

12.15

风云卫星及其空间探测能力

王劲松 | 国家卫星气象中心

12.22

地月空间粒子辐射环境及其对月表物质的影响

史全岐 | 山东大学

12.29

南中国电离层等离子体泡和闪烁短临预测- 挑战和展望

李国主 | 中科院地质与地球物理研究所

01.05

Jupiter’s heavy ion radiation belts: new insights from the Galileo and Juno missions

Elias Roussos | Max Planck Institute for Solar System Research

01.12

Energetic electron precipitations by chorus waves and its impact on the middle atmosphere

Yoshi Miyoshi | Nagoya University

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