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Space and Terrestrial Electromagnetism Lab
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The lab explores electromagnetic and plasma phenomena in space through observation and theory.
AboutAbout the lab
Exploring cosmic electromagnetism and plasma through observation and theory
The lab studies space around Earth, the Moon, and the planets, based on electromagnetism and plasma physics.
Through observational research using rockets and space probes, together with theoretical research, the lab also looks toward the origin of the solar system and electromagnetic phenomena in even more distant space.
The lab's research targets diverse electromagnetic and plasma phenomena across very wide regions of space.
The lab was founded in 1945 as the first chair in Japan in charge of terrestrial electromagnetism.
Key terms
- Magnetic moment
- A quantity that serves as an indicator of magnetic field strength
- Radiation belt
- A region in Earth's magnetosphere where high-energy particles are present
- Coronal mass ejection
- A phenomenon in which plasma gas is suddenly ejected from the Sun's surface
NewsLab news
A doctoral student received the Best Student Poster award at AOGS2026
A master's student received a Poster Prize at the 9th Asia-Pacific Conference on Plasma Physics
A paper showing that ULF waves can form duct propagation structures was published in Earth, Planets and Space
ResearchResearch themes
The lab's research covers many regions, from Earth's electromagnetic environment to Jupiter, Saturn, the Moon, the formation of the early solar system, and the relativistic universe. Based on electromagnetism and plasma physics, it works with a variety of approaches: theory, data analysis, and observation.
*Illustrative imageObserving EMIC Waves in Jupiter's Magnetosphere
Jupiter's magnetosphere is huge and powerful, with a magnetic moment, an indicator of magnetic field strength, 20,000 times that of Earth. The lab uses data from the Juno spacecraft to study EMIC waves in this magnetosphere.
*Illustrative imagePropagation of EMIC Waves
In Earth's radiation belts, particles are thought to be lost under the influence of solar activity and to precipitate toward Earth. The lab uses multi-point satellite observations to study how EMIC waves propagate.
*Illustrative imageAnalysis of Solar Radio Bursts
Coronal mass ejections (CMEs) occur on the Sun's surface, and the shock waves they produce travel through interplanetary space. Based on satellite and ground-based observations, the lab analyzes solar radio bursts.
*Illustrative imageDecay of Alfvén Waves in the Solar Atmosphere
The solar atmosphere is known for a structure in which temperature rises from about 6,000 K at the photosphere to about 1 million K in the corona. In this atmosphere, the lab analyzes the parametric decay instability of Alfvén waves.
MembersFaculty
The lab's members consist of faculty, visiting researchers, technical assistants, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorYuto Katoh
- Associate ProfessorAtsushi Kumamoto
VoicesStudent voices
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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: “Aurora Seen From Space by NASA” NASA -- US government agency / Public domain (cropped)
- Observing EMIC Waves in Jupiter's Magnetosphere: “Jupiter's Magnetosphere animation” NASA/JPL / Public domain (cropped)
- Propagation of EMIC Waves: “Van Allen Radiation Belt Model shown with 2 VA Probes” NASA / Public domain (cropped)
- Analysis of Solar Radio Bursts: “Magnificent CME Erupts on the Sun - August 31” NASA Goddard Space Flight Center / CC BY 2.0 (cropped)
- Decay of Alfvén Waves in the Solar Atmosphere: “Solar Orbiter’s widest high-res view of the Sun ESA508430” European Space Agency / CC BY-SA 3.0 igo (cropped)
- Related lab (Planetary Atmospheric Physics Lab): “Mars atmosphere” NASA / Public domain (cropped)
- Related lab (Tomida Lab): “HD 163296 protoplanetary disk by ALMA (16CB25B)” ALMA (ESO/NAOJ/NRAO); A. Isella; B. Saxton (NRAO/AUI/NSF) / CC BY 4.0 (cropped)
- Related lab (Toma Lab): “Artist’s illustration of galaxy with jets from a supermassive black hole” ESA/Hubble, L. Calçada (ESO) / CC BY 4.0 (cropped)
- Related lab (Chiba Lab): “NGC 2403 - A Galaxy of Birth and Death (iotw2221a)” KPNO/NOIRLab/NSF/AURA/M. T. Patterson (New Mexico State University) Image processing: T.A. Rector (University of Alaska Anchorage/NSF’s NOIRLab), M. Zamani & D. de Martin (NSF’s NOIRLab) / CC BY 4.0 (cropped)
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