A5085234034- Geomagnetism and Paleomagnetism Studies
- Planetary Science and Exploration
- Solar and Space Plasma Dynamics
- Astro and Planetary Science
- Nonlinear Partial Differential Equations
- Geophysics and Gravity Measurements
- Advanced Mathematical Modeling in Engineering
- Ionosphere and magnetosphere dynamics
- Numerical methods in inverse problems
- Differential Equations and Boundary Problems
- Advanced Mathematical Physics Problems
- Scientific Research and Discoveries
- Geology and Paleoclimatology Research
- Advanced Harmonic Analysis Research
- Geometric Analysis and Curvature Flows
- Earthquake Detection and Analysis
- Marine and environmental studies
- Geophysical and Geoelectrical Methods
- Nonlinear Differential Equations Analysis
- Navier-Stokes equation solutions
- Spectral Theory in Mathematical Physics
- Stability and Controllability of Differential Equations
- Magnetic and Electromagnetic Effects
- Space Science and Extraterrestrial Life
- Fluid dynamics and aerodynamics studies
Kyushu University
2016-2025
Rigaku (Japan)
2023-2024
Osaka City University
2010-2022
Osaka Metropolitan University
2022
Tohoku Institute of Technology
2021
Korea Advanced Institute of Science and Technology
2018
Mathematical Institute of the Slovak Academy of Sciences
2015
Tokyo Institute of Technology
2005-2014
Japan Aerospace Exploration Agency
2005-2010
Institute of Space and Astronautical Science
2005-2010
Interaction between the solar wind and objects in system varies largely according to settings, such as existence of a global intrinsic magnetic field and/or thick atmosphere. The Moon's case is characterized by absence both them. Low energy ion measurements on lunar orbit realized more than 30 years after Apollo period low charged particle analyzers MAP‐PACE board SELENE(KAGUYA). sensors have found that 0.1%∼1% protons are reflected back from Moon instead being absorbed surface. Some ions...
Abstract We have provided preliminary global maps of three components the lunar magnetic anomaly on surface applying vector mapping (SVM) method. The data used in present study consist about 5 million observations field at 10–45 km altitudes by Kaguya and Lunar Prospector. anomalies were mapped 0.2° equi‐distance points SVM method, showing highest intensity 718 nT Crisium antipodal region. Overall features indicate that elongating are likely to be dominant Moon except for young large basins...
Numerical simulations of the geodynamo have successfully represented many observable characteristics geomagnetic field, yielding insight into fundamental processes that generate magnetic fields in Earth's core. Because limited spatial resolution, however, diffusivities numerical dynamo models are much larger than those core, and consequently, questions remain about how realistic these are. The typical strategy used to address this issue has been continue increase resolution quasi-laminar...
Air-water flow was investigated in 65.8 and 122 mm columns packed with glass spheres of 5 different sizes (2.59-16.5 mm) up to air water rates G=2×104 L=106 kg/m2 hr, respectively. Flow pattern is classified into 4 regimes a diagram flow-pattern boundary prepared, including new region "dispersed bubble flow" observed for G<5×103 L>105 kg/m2hr. Gas continuous always appears L<104 For L = 104-105 kg/m2hr, pulse occurs only at intermediate rate. Transitional between gas very narrow. Pressure...
At ~25 km altitude over magnetic anomalies on the Moon, deceleration of solar wind ions, acceleration electrons parallel to field, and heating ions reflected by were simultaneously observed MAP-PACE Kaguya. Deceleration was for two major ion compositions: protons alpha particles. had same ΔE /q (ΔE: energy, q: charge) both In addition, energy almost as ions. This indicates existence an anti-moonward electric field anomaly above The in a much larger area than where enhancement observed. These...
On August 17, 1999, a destructive earthquake occurred in the western part of North Anatolian Fault Zone, Turkey. The source region has been designated as seismic gap and an M7-class supposed to occur someday future so fill this gap. So far we have undertaken various kinds observations area could obtain some valuable data before, during after mainshock. Here report preliminary results our recent studies, which include field work started late July year continued occurrence just its vicinity,...
High-resolution, low-viscosity geodynamo simulations have been carried out on the Earth Simulator, one of fastest supercomputers, in a dynamic regime similar to that Earth's core, is, quasi-Taylor state. Our dynamo models exhibit features not only spatial and temporal characteristics but also dynamics. Polarity reversals occurred when magnetic flux patches at high latitudes moved poleward disappeared; with reversed field low mid-latitudes then poleward.
The Moon has no global intrinsic magnetic field and only a very thin atmosphere. Ion measurements made from lunar orbit provide us with information regarding interactions between the solar wind planetary surface, surface composition through secondary ion mass spectrometry source loss mechanisms of tenuous An energy spectrometer MAP‐PACE IMA onboard orbiter SELENE (KAGUYA) detected low‐energy ions at 100‐km altitude. have elucidated that originate exosphere are least composed He + , C O Na K...
We study solar wind (SW) entry deep into the near‐Moon wake using SELENE (KAGUYA) data. It has been known that SW protons flowing around Moon access central region of distant lunar wake, while their intrusion never expected. show sneak deepest (anti‐subsolar at ∼100 km altitude), and yields strong asymmetry environment. Particle trajectory calculations demonstrate these are once scattered dayside surface, picked‐up by motional electric field, finally wake. Our results mean surface coming...
Paying attention to the discrepancy between available data, probably due uncertainty in void fraction, entrance end effect and characteristics of experimental method, newexperimental results were obtained for air-water flow 65.8 122 mmφ. columns packed with glass spheres six different sizes 2.59 24.3 mm0.The two-phase pressure loss based on an energy (not momentum) balance was correlated terms Lockhart-Martinelli parameters as follows : φl=1.30+1.85χ-0.85, 0.1<χ<20The total liquid holdup Ri...
Stratified convection in the outer core may influence Earth’s magnetic field.
In contrast to many ground‐based optical observations of the thin lunar alkali exosphere, in situ exospheric ions by satellite‐borne plasma instruments have been quite rare. MAP‐PACE‐IMA onboard Japanese orbiter SELENE (KAGUYA) succeeded detecting Moon originating at 100 km altitude. Here we make first report ion detection during intervals when was embedded Earth's magnetotail lobe. absence effects on source process, species H + , He ++ C O Na K and Ar are definitively identified. The fluxes...
Abstract Though the Moon does not possess a global magnetic field like Earth, there are localized crustal fields on lunar surface. Because of plasma interaction with fields, electrostatic and electromagnetic environments near magnetized regions can differ from those non‐magnetized Moon. Previous studies observationally revealed difference in potential surface between solar wind, which was attributed to upward electric formed by electron‐ion decoupling above anomaly regions. However, these...
Abstract Ground calibration experiments of the SELENE high sensitivity fluxgate Lunar Magnetometer (LMAG) have been performed in order to determine alignment, sensitivity, and offset sensors (MGF-S). It is checked out that are orthogonal each other within 0.4 degrees, linearity ambient magnetic field output from confirmed. Also, temperature dependences examined but no clear signatures dependencies can be seen. has an in-flight system direction magnetometer routinely. The fields generated by...
We study solar wind (SW) intrusion into the near‐Moon wake using SELENE (KAGUYA) data. It has been known that SW protons are gradually accelerated toward center along magnetic field in distant lunar wake, while never measured. show come at ∼100 km altitude direction perpendicular to field, as they gain kinetic energy one hemisphere lose other hemisphere. Particle trajectory calculations and theoretical treatment demonstrate proton Larmor motions inward electric around boundary result loss of...
The discovery of Mercury's unusually axisymmetric, anomalously axially offset dipolar magnetic field reveals a new regime planetary fields. cause the dipole remains to be resolved, although some exotic models have been proposed. Deciphering why Mercury has such an anomalous is crucial not only for understanding internal dynamics, evolutionary history and origin planet, but also establishing general dynamo theory. Here we present numerical models, where core convection driven as...
In order to investigate the resistivity structure beneath northern and southern branches of western part North Anatolian Fault Zone (NAFZ), which has been known as a seismic gap area, we started wideband magnetotelluric (MT) measurements on 27 July 1999, along north-south profile crossing branch near Izmit Iznik. When (Kocaeli) earthquake ( M w 7.4) occurred 17 August MT fields were being measured at five sites, four happened be located surface rupture zone associated with mainshock, large...
Dynamo action possibly working in the fluid core of Mercury is examined using numerical models a thin spherical shell. Dipolar (DP) dynamos are obtained regime columnar flows outside tangent cylinder (TC), whereas non‐dipolar (NDP) dominated by multipole components found both inside and TC. It turns out that columnar‐like convective motions not only but also TC responsible for NDP dynamo. The electrically conducting inner enhances strength large‐scale magnetic field, predominance remains due...