SPACE PHYSICS · PLANETARY SCIENCE

Understanding planetary
space environments.

I study how planetary magnetospheres and upper atmospheres interact, from Earth to Jupiter.

I am a Research Assistant Professor in the Department of Earth and Planetary Sciences at The University of Hong Kong and a faculty researcher in the Planetary Space Environment Modeling (PSEM) Group. I am also a member of the Planetary Space Environment Laboratory at the HKU Shenzhen Institute of Research and Innovation. I received my PhD in Geophysics in 2021 from the University of Science and Technology of China, where I conducted my doctoral research in the Ionosphere Lab. I was a research visitor at the High Altitude Observatory, National Center for Atmospheric Research.

My research combines global numerical models, including GAMERA and TIE-GCM, with observations to investigate magnetic reconnection, ionospheric electrodynamics, and magnetosphere–ionosphere coupling at Earth and Jupiter. I have authored over 30 papers, including 14 as first or corresponding author. I have secured RGC GRF and Guangdong NSF funding as PI. I teach three undergraduate courses at HKU. I have organized scientific sessions at AOGS and COSPAR, am a member of the COSPAR ISWAT H4-03 action team, and serve as a reviewer for journals including GRL, JGR, Science China Earth Sciences, and Radio Science.

Recent updates

01

Research

Global numerical modeling of planetary space environments and space weather, supported by observational analysis.

MAGNETOSPHERES

Magnetospheric dynamics

Magnetic topology, reconnection, and solar-wind interactions in planetary magnetospheres, including Jupiter and Ganymede, with ongoing work on Jovian turbulence.

IONOSPHERES

Ionospheric electrodynamics

How neutral winds and conductivity shape electric fields and plasma drifts, from daily variations to space weather responses.

COUPLED SYSTEMS

Magnetosphere–ionosphere coupling

How rotation, winds, and magnetic topology couple magnetospheres, ionospheres, and thermospheres across planets. Planned work includes modeling Jupiter’s thermosphere.

02

Publications

14 first- or corresponding-author papers
30+ papers in total

Representative publications 5 papers

  1. 2026
  2. 2026

    The role of planetary rotation in polar cusp localization

    Chen, J.*, Delamere, P. A., Lotko, W., Xu, Y., Yao, Z., Brambles, O., Feng, E., Yang, Z., Pham, K. H., & Zhang, B.*

    Geophysical Research Letters, 53(10), e2026GL122024 DOI ↗

  3. 2024

    Numerical investigation of magnetic reconnection in Jupiter’s dayside magnetodisc

    Chen, J., Zhang, B.*, Delamere, P. A., Yao, Z., Guo, R., & Brambles, O.

    Astronomy & Astrophysics, 691, A13 DOI ↗

  4. 2023

    Prediction of axial asymmetry in Jovian magnetopause reconnection

    Chen, J.*, Zhang, B.*, Lin, D., Delamere, P. A., Yao, Z., Brambles, O., Sorathia, K. A., Merkin, V. G., & Lyon, J. G.

    Geophysical Research Letters, 50(9), e2022GL102577 DOI ↗

  5. 2020

    The physical mechanisms for the sunrise enhancement of equatorial ionospheric upward vertical drifts

    Chen, J., Wang, W., Lei, J.*, & Dang, T.

    Journal of Geophysical Research: Space Physics, 125(8), e2020JA028161 DOI ↗

Other selected publications 13 papers

  1. 2026

    GAMERA-OP: A three-dimensional finite-volume magnetohydrodynamic solver for orthogonal curvilinear geometries

    Luo, H., Zhang, B.*, Tian, J., Cai, J., Chen, J., Feng, E., Zheng, Z., Xi, S., & Lyon, J. G.

    The Astrophysical Journal Supplement Series, 285(1), 15 DOI ↗

  2. 2026

    Shock-induced magnetic reconnection in the Venusian magnetotail

    Zhang, M., Dang, T.*, Lei, J.*, Zhang, B., Wang, R., Xiao, S., Zhang, T., Chen, J., & Yan, M.

    Nature Communications, 17, 6513 DOI ↗

  3. 2026

    Dawn-dusk asymmetrical distribution of Saturn’s cusp

    Xu, Y., Yao, Z. H.*, Arridge, C. S., Zhang, B., Chen, J. J., Badman, S. V., Ray, L. C., Coates, A. J., Ye, S.-Y., Qin, T. S., Zheng, Z. Q., Dunn, W. R., & Wei, Y.

    Nature Communications, 17, 1861 DOI ↗

  4. 2024

    The dynamic response of Jovian magnetotail reconnection to enhanced solar wind ram pressure

    Chen, J.*, Zhang, B.*, Delamere, P. A., Yao, Z., & Brambles, O.

    The Astrophysical Journal, 969(2), 137 DOI ↗

  5. 2024
  6. 2024

    Unveiling the connection between the Alfvénic oval and the open–closed field line boundary at Ganymede

    Yan, T., Zhang, B., Chen, J.*, Yang, Z., Ye, S., & Cui, J.

    The Astrophysical Journal, 975(1), 107 DOI ↗

  7. 2024

    A unified framework for global auroral morphologies of different planets

    Zhang, B., Yao, Z.*, Brambles, O. J., Delamere, P. A., Lotko, W., Grodent, D., Bonfond, B., Chen, J., Sorathia, K. A., Merkin, V. G., & Lyon, J. G.

    Nature Astronomy, 8, 964–972 DOI ↗

  8. 2024

    In situ evidence of the magnetospheric cusp of Jupiter from Juno spacecraft measurements

    Xu, Y., Arridge, C. S., Yao, Z. H.*, Zhang, B., Ray, L. C., Badman, S. V., Dunn, W. R., Ebert, R. W., Chen, J. J., Allegrini, F., Kurth, W. S., Qin, T. S., Connerney, J. E. P., McComas, D. J., Bolton, S. J., & Wei, Y.

    Nature Communications, 15, 6062 DOI ↗

  9. 2022

    The response of geomagnetic daily variation and ionospheric currents to the annular solar eclipse on 21 June 2020

    Liu, X., Chen, J., Han, P., Lei, J.*, Dang, T., Huang, F., Chen, H., Jiao, L., Ma, X., Tu, J., Lei, Y., & Zhao, J.

    Journal of Geophysical Research: Space Physics, 127(6), e2022JA030494 DOI ↗

  10. 2021

    Ionospheric electrodynamic response to solar flares in September 2017

    Chen, J., Lei, J.*, Wang, W., Liu, J., Maute, A., Qian, L., Zhang, R., & Dang, T.

    Journal of Geophysical Research: Space Physics, 126(11), e2021JA029745 DOI ↗

  11. 2021

    Longitudinal variations of equatorial ionospheric electric fields near sunrise

    Chen, J., Wang, W., & Lei, J.*

    Journal of Geophysical Research: Space Physics, 126(5), e2020JA028977 DOI ↗

  12. 2020

    A simulation study on the relationship between field-aligned and field-perpendicular plasma velocities in the ionospheric F region

    Chen, J., Lei, J.*, Zhang, S., Wang, W., & Dang, T.

    Journal of Geophysical Research: Space Physics, 125(1), e2019JA027350 DOI ↗

  13. 2019

    A simulation study on the latitudinal variations of ionospheric zonal electric fields under geomagnetically quiet conditions

    Chen, J. & Lei, J.*

    Journal of Geophysical Research: Space Physics, 124(2), 1444–1453 DOI ↗

* Corresponding author.

03

Teaching

Undergraduate teaching at The University of Hong Kong.

  • EASC3420

    Machine Learning for Earth and Planetary Sciences

    Teaching since Autumn 2026 · annually

  • EASC2410

    Data Analysis and Modeling in Earth Sciences

    Teaching since Spring 2025 · annually

  • EASC2404

    Introduction to Atmosphere and Hydrosphere

    Teaching since Autumn 2024 · annually

04

Research funding & projects

Principal Investigator (PI)

  • RGC General Research Fund (GRF)

    Polar cap aurora during extreme solar wind depression: source drivers and cross-planetary implications

    · HK$1,044,800 · Grant No. 17304226 · Awarded

  • Guangdong Natural Science Fund — General Programme

    Responses of Jupiter’s rotation-driven magnetic reconnection to upstream solar wind

    · RMB 100,000 · Grant No. 2026A1515011076

  • HKU Seed Fund for Basic Research — GRF/ECS Resubmission

    Polar cap aurora during extreme solar wind depression: source drivers and implication to other planets

    · HK$60,000

  • HKU Seed Fund for PI Research — Basic Research

    Physical mechanisms of ionospheric scintillation in the Greater Bay Area during geomagnetically quiet periods

    · HK$110,760

Collaborative projects

  • National Key R&D Program of China

    Scientific research on Jupiter’s space environment and principles of exploration

    · Key project member · Project No. 2025YFF0512400

  • NSFC General Program

    Magnetic reconnection at Jupiter’s magnetopause

    · Project team member · Grant No. 42374216

05

Experience & education

2024 — present

Research Assistant Professor

The University of Hong Kong

Department of Earth and Planetary Sciences

Research collaborators: Prof. Binzheng Zhang and Prof. Zhonghua Yao

2021 — 2024

Postdoctoral Fellow

The University of Hong Kong

Supervisor: Prof. Binzheng Zhang

2019 — 2020

Research Visitor

High Altitude Observatory, NCAR

Host: Dr. Wenbin Wang

2016 — 2021

PhD in Geophysics

University of Science and Technology of China

Supervisors: Prof. Jiuhou Lei (USTC); Dr. Wenbin Wang (HAO/NCAR)

2012 — 2016

BSc in Geophysics

University of Science and Technology of China

06

Activities & service

International session convener

  • 2026 · COSPAR

    PSW.2: Space Weather at Planetary Bodies in the Solar System.

    Insoo Jun (Main Scientific Organizer); Junjie Chen (Deputy Organizer); Christina Plainaki and Rok-Soon Kim (Scientific Organizing Committee).

  • 2025 · AOGS

    PS08: Planetary Space Weather: fundamental plasma interactions in space environments.

    Junjie Chen (Primary Convener), Peter Delamere, Ruilong Guo, Tomoki Kimura, and Binzheng Zhang.

2024–2025 · OUTREACH

Outreach coordinator & instructor

Coordinated the Hong Kong Planetary Sciences Outreach Programme with the Yew Chung Yew Wah Education Network, and led a student project on using aurorae to investigate space energy processes.

ACADEMIC SERVICE

Peer review

Reviewer for Geophysical Research Letters, JGR: Space Physics, Science China Earth Sciences, Radio Science, and Astrophysics and Space Science.

Junjie Chen outdoors with mountains in the background
Away from the desk
PROSPECTIVE STUDENTS

Explore space physics
with me at HKU.

I welcome enquiries from prospective PhD students interested in planetary magnetospheres, ionospheric electrodynamics, aurorae, and global numerical modeling.

Applicants with backgrounds in space physics, physics, geophysics, applied mathematics, or related disciplines are encouraged to get in touch.

For 2027 entry, see our PhD recruitment announcement for research opportunities and application details.

For an initial discussion, please email me with your CV, academic transcripts, and a short description of your research interests.

cjjvince@hku.hk