Space Environmental Fluid Dynamics

Space is filled with plasma. In our heliosphere the main source of plasma is the sun. Magnetospheres of planets are connected with the sun via the plasma filling the interplanetary space. Their behaviour is influenced in many ways by solar activity. The heliosphere itself is exposed to interstellar space which is also filled with interstellar plasma... We study a variety of space environments from near Earth to distant high energy objects. We also work to develop the propulsion techniques of spacecraft by controlling plasma.

Information for doctoral course entrance exam is here  --> IEI program, IGSES doctoral program


B4 members have successfully presented a defense of graduation thesis
M2 members have successfully presented a defense of master’s thesis
Iwamoto-san published an article entitled ’Linearly Polarized Coherent Emission from Relativistic Magnetized Ion-Electron Shocks’ in PRL.
Yoshida-san’s doctoral dissertation public defense was held.
Intensive lecture by Dr. S. Zenitani (Space Research Institute, Graz) was held.


Physics of Collisionless Shocks
Collisionless shocks play a role as an energy converter in space. In the vicinity of a collisionless shock, extremely large amplitude waves as well as nonthermal particles are often observed. However, the mechanisms how they are generated are not well understood. Our aim is to understand the physical processes associated with collisionless shocks by using theory, numerical simulation, spacecraft data analysis, and high power laser experiment.
Nonlinear waves and turbulence in space plasma
It is quite important to understand why and how extremely high amplitude waves and turbulence are generated and developed in space, since it is directly related with the behavior of background plasma as well as high energy particles. We aim to reveal the origin and the basic features of nonlinear waves and turbulence in space plasma by using theory, modeling, numerical simulations, and spacecraft data analysis.
Acceleration and transport of cosmic rays
Cosmic rays are high energy charged particles observed in space as well as on the ground. The energy distribution of cosmic rays shows power law nature in wide range of energy. The reason why such energy distribution is formed has not been well understood. We study acceleration/transport of charged particles by using theory, modeling, and numerical simulations.
Relativistic plasma
Since the plasma surrounding a high energy astrophysical object has extremely high energy, relativistic effects need to be taken into account in order to understand the phenomena occurring there. Basic properties of a relativistic plasma have been unresolved yet. We study some relaxation processes occurring in relativistic plasmas using theory, modeling, and numerical simulations.
High-density radiofrequency plasma
A radio-frequency plasma source is essential to our society as it is used for the electric propulsion system of satellite and the plasma processing for manufacturing semiconductor. A high-density plasma source will become more important with increasing needs of high-power thruster in the future long-term missions such as human Mars exploration and to realize more efficient and high-speed plasma processing. In our laboratory, we investigate the production mechanism of radio-frequency plasmas by numerical simulation and developing more efficient and high-density plasma source.