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Solar-Terrestrial Environment Physics (SST) Lab
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The lab studies the solar-terrestrial environment by analyzing the Sun and Earth as a single system.
AboutAbout the lab
Viewing the Sun and Earth as one system
The Solar-Terrestrial Environment Physics (SST) Lab studies the structure and variability of the "solar-terrestrial environment," which consists of the Sun and Earth, as a single system.
Research topics are wide-ranging, from solar activity such as solar flares and sunspots to geomagnetic and electromagnetic phenomena on Earth such as the aurora and magnetic storms.
In collaboration with researchers in Japan and abroad, the lab pursues integrated analysis research that combines the analysis of huge volumes of ground-based and satellite observation data with state-of-the-art computer simulations.
The lab also works with related institutions on research to advance space weather forecasting, which aims to scientifically understand and predict variations in the solar-terrestrial environment.
Key terms
- Solar flare
- An explosive phenomenon that occurs on the surface of the Sun
- Magnetic storm
- A phenomenon in which Earth's magnetic field is greatly disturbed
- Space weather forecasting
- Efforts to predict changes in the space environment caused by solar activity
- Magnetic reconnection
- A phenomenon in which magnetic field lines reconnect and stored energy is released
NewsLab news
Simultaneous ground-based and Arase satellite observations reveal that pulsating aurora created by ducts occur more often in the morning
Discovery that a huge magnetic storm transports large amounts of oxygen ions of Earth atmospheric origin into space
World's first discovery of pulsating aurora expanding in a ring shape
International fleet of space probes used to clarify how solar particle radiation travels through the solar system
Multi-point comparison of multiple spacecraft clarifies the relationship between cosmic ray variations and solar plasma
ResearchResearch themes
The lab studies the structure and variability of the solar-terrestrial environment system, which consists of the Sun, interplanetary space, and Earth's electromagnetic environment, and conducts research to predict that variability. In particular, in collaboration with researchers in Japan and abroad, it pursues integrated analysis research that combines computer simulations and numerical models with the analysis of ground-based and satellite observation data.
*Illustrative imageSolar Flares and Sunspot Activity
The lab investigates the mechanisms and prediction of solar flares, particle acceleration in flares, and the structure and heating of the solar corona. It also works on modeling of solar active regions, the cyclic activity of sunspots, and prediction of the next sunspot cycle.
*Illustrative imageSolar Wind and Interplanetary Space
The lab conducts simulation research to predict the solar wind and the interplanetary magnetic field.
*Illustrative imageEarth's Electromagnetic Environment and Its Effects on Space Weather
The lab studies magnetospheric substorms, Earth's radiation belts, the aurora, interaction with the solar wind in the magnetospheric boundary layer, and waves in the electromagnetic environment. It also pursues research on the effects of high-energy particles.
*Illustrative imageSpace Plasma Phenomena
The lab studies space plasma phenomena such as magnetic reconnection, collisionless perpendicular shock waves, and the Rayleigh-Taylor instability.
MembersFaculty
The lab's members consist of faculty, project faculty, JSPS Research Fellows, institutional researchers, doctoral, master's, and undergraduate students, academic chief specialists, technical staff, technicians, and technical assistants, and administrative staff and administrative assistants.As of 2026
- ProfessorHideyuki Hotta
- Associate ProfessorSatoshi Masuda
- Associate ProfessorYuki Harada
- Assistant ProfessorAkimasa Ieda
- ProfessorYoshizumi Miyoshi
- Associate ProfessorHaruhisa Iijima
- Assistant ProfessorTakashi Hayakawa
- ProfessorRumi Nakamura
- Project ProfessorKanya Kusano
- Project ProfessorMamoru Ishii
- Project Associate ProfessorTomoaki Hori
- Project Assistant ProfessorJUN Chae-Woo
- Project Assistant ProfessorAtsuki Shinbori
- Project Assistant ProfessorTakuma Matsumoto
- Project Assistant ProfessorNaritoshi Kitamura
- Project Assistant ProfessorKazuhiro Yamamoto
- Project Assistant ProfessorShota Chiba
- Project Assistant ProfessorPORUNAKATU Shreedevi Radhakrishna
- Project Assistant ProfessorLUKIN Alexander
- Project Assistant ProfessorYoshiki Hatta
- Project Assistant ProfessorSHI Xiaofei
- Project Assistant ProfessorRyota Shimada
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “First GOES-17 SUVI Images Capture Solar Flare ( )” NOAA Satellites / Public domain (cropped)
- Solar Flares and Sunspot Activity: “Magnificent CME Erupts on the Sun - August 31” NASA Goddard Space Flight Center / CC BY 2.0 (cropped)
- Solar Wind and Interplanetary Space: “Solar Orbiter’s widest high-res view of the Sun ESA508430” European Space Agency / CC BY-SA 3.0 igo (cropped)
- Earth's Electromagnetic Environment and Its Effects on Space Weather: “Aurora borealis over Eielson Air Force Base, Alaska” United States Air Force photo by Senior Airman Joshua Strang / Public domain (cropped)
- Space Plasma Phenomena: “Coronal Rain, Solar Storm ( )” NASA Goddard Space Flight Center from Greenbelt, MD, USA / Public domain (cropped)
- Related lab (Heliospheric Plasma Physics (SW) Lab): “Antenna array of URAN-2 radio teelscope” YeS (Serge Yerin) / CC BY-SA 4.0 (cropped)
- Related lab (Space Physics Observation (SSE) Lab): “Aurora Borealis over the Killarney Provincial Park Observatory” KillarneyDiscovery / CC0 (cropped)
- Related lab (Complexity Science Experiment (ΣE) Lab): “Experimental hall of the Wendelstein 7-X stellarator at IPP Greifswald 04” Siarhei Besarab / CC BY-SA 4.0 (cropped)
- Related lab (Plasma Theory (P) Lab): “Cross-section of the Wendelstein 7-X plasma vessel” Siarhei Besarab / CC BY-SA 4.0 (cropped)
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