A5028787799- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Astro and Planetary Science
- Radiation Therapy and Dosimetry
- Space Satellite Systems and Control
- Geomagnetism and Paleomagnetism Studies
- Spacecraft Design and Technology
- Planetary Science and Exploration
- Radiation Detection and Scintillator Technologies
- Earthquake Detection and Analysis
- Nuclear Physics and Applications
- Space exploration and regulation
- Graphite, nuclear technology, radiation studies
- Radiation Effects in Electronics
- Nuclear reactor physics and engineering
- Geophysics and Gravity Measurements
- Particle Detector Development and Performance
- Satellite Communication Systems
- Plasma Diagnostics and Applications
- Advanced Radiotherapy Techniques
- High-Velocity Impact and Material Behavior
- Particle accelerators and beam dynamics
- Gamma-ray bursts and supernovae
- Magnetic confinement fusion research
- Radioactivity and Radon Measurements
Japan Aerospace Exploration Agency
2014-2025
Tsukuba Medical Center Hospital
2011-2021
National Institute of Information and Communications Technology
2009-2020
Osaka Prefecture University
2020
Nagoya University
2020
Kubota (Japan)
2020
Institute of Space and Astronautical Science
2005-2013
Institute of Space Technology
2006
IMEC
1998
Fujitsu (Japan)
1998
We studied magnetic field dipolarization and associated ion acceleration in the deep inner magnetosphere, using data obtained by magnetometer on board Mission Demonstration Satellite 1 (MDS‐1) energetic neutral atom (ENA) flux high‐energy analyzer imager Imager for Magnetopause‐to‐Aurora Global Exploration satellite. Because MDS‐1 satellite has a geosynchronous transfer orbit, we could survey variations at L = 3.0–6.5. Analyzing period from February to July 2002, found that (1) can be...
Abstract Cosmic-ray neutron energy spectra from thermal to 15MeV were measured with a multimoderator spectrometer known as the Bonner Ball Neutron Detector (BBND) at aviation altitude (9–11 km). Four flights carried out around Nagoya Airport in Japan. The data unfolded using maximum entropy deconvolution code MAXED, and derived agreed calculated results PHITS-based analytical radiation model atmosphere (PARMA). of in-flight measurement verified accuracy calculation regard neutrons within...
Abstract We study a magnetosphere‐ionosphere coupling at low latitudes during moderate (corotating interaction regions/high‐speed solar wind streams‐driven) geomagnetic storm on 22 July 2009. Recently, it has been shown that major (coronal mass ejection‐driven) storms, quasi‐trapped >30 keV electrons largely enhance below the radiation belt in forbidden zone and produce an additional ionization topside ionosphere. In this work, we examine case of recurrent when through also may take...
Abstract We study magnetic fluctuations embedded in dipolarizations the inner magnetosphere (a geocentric distance of ≤6.6 R E ) and their associated ion flux changes, using Engineering Test Satellite VIII Active Magnetospheric Particle Tracer Explorers/CCE satellites. select seven events dipolarization that occur during main phase storms having a minimum value Dst index less than −40 nT. It is found (1) all are accompanied by strong with major frequency close to local O + gyrofrequency; (2)...
The extremely high-energy electron experiment (XEP) onboard the Arase (ERG) satellite is designed to measure electrons in Earth's radiation belts. XEP was developed by taking advantage of our technical heritage particle detectors that are Earth observation satellites Japan Aerospace Exploration Agency (JAXA) as monitor. main target precisely variations relativistic outer belt even during magnetic storms. measurement scientifically required address physical mechanisms acceleration and loss....
Abstract We propose an application of the independent component analysis (ICA) to separate satellite‐induced time‐varying stray fields from magnetic field data obtained using onboard multiple magnetometers. The ICA is a method for estimating source signals at sites so that estimated can become statistically each other. Since variations are external natural variations, expected fields. Thus, we applied first Quasi‐Zenith Satellite, which has two triaxial fluxgate magnetometers, without...
The ERG (Exploration of energization and Radiation in Geospace) is Japanese geospace exploration project. project focuses on relativistic electron acceleration mechanism the outer belt dynamics space storms context cross-energy coupling via wave-particle interactions. consists satellite observation team, ground-based network integrated-data analysis/simulation team. was launched December 20 2016 has been nicknamed, "Arase". This paper describes overview future plan for observations.
We examine the temporal variations of energy spectra energetic neutral atoms (ENAs) detected by High Energy Neutral Atom imager (HENA) onboard Imager for Magnetopause‐to‐Aurora Global Exploration (IMAGE) satellite during three substorms on 21 October 2001 and 19 March 2002; occurred storm main phase. The ENA used in present study ranges from 10 to 198 keV hydrogen 29 222 oxygen. use data obtained two independent areas a HENA image, which lines sight pass through inner magnetosphere (∼−6 R E...
The total dose data from a Tsubasa (MDS-1) satellite, flying in highly eccentric orbit, is analyzed. measured by the small dosimeter using RADFETs. RADFETs have been calibrated with Co60 gamma ray source, and 56 devices (denoted DOS-S) were mounted several experimental modules satellite. behind certain Aluminum shield domes analyzed initially. change affected electron flux thin shield. In thicker shield, proton affect profile.
Abstract Although solar activity may significantly impact the global environment and socioeconomic systems, mechanisms for eruptions subsequent processes have not yet been fully understood. Thus, modern society supported by advanced information systems is at risk from severe space weather disturbances. Project solar–terrestrial prediction (PSTEP) was launched to improve this situation through synergy between basic science research operational forecast. The PSTEP a nationwide collaboration in...
It is observed that fast waves launched into an electron cyclotron heated plasma from a phased four-strip-line antenna array couple effectively with core electrons. This coupling produces enhanced emission and drop in the loop voltage. These effects depend on phase difference between adjacent strip lines density. An absorption efficiency of 20% deduced under conditions ${v}_{\mathrm{ph}}$/${v}_{e0}$\ensuremath{\sim}3 ${f}_{0}$/${f}_{\mathrm{LH}(0)\mathrm{\ensuremath{\sim}}0.38}$. The...
The Advanced Earth Observing Satellite II (ADEOS-II) was launched into sun-synchronous, sub-recurrent orbit on December 14, 2002, and its operation terminated unexpectedly October 24, 2003. While in orbit, the Technical Data Acquisition equipment board ADEOS-II monitored space radiation environment effects, including total-dose single-event upset, recording them 16 M 64 M-DRAM memories. In this paper, we analyze first data results from these monitors.
A new type of solar neutron detector (FIB) was launched on board the Space Shuttle Endeavour July 16, 2009, and began collecting data at International Station (ISS) August 25, 2009. This paper summarizes three years observations obtained by FIB until end 2012. The can determine both energy arrival direction neutrons. We measured spectra background neutrons over South Atlantic Anomaly (SAA) region elsewhere found typical trigger rates to be 20 0.22 counts/sec, respectively. It is possible...
A new type of solar neutron detector (NEM) was launched by the space shuttle Endeavour on 16 July 2009 and it began collecting data 25 August at International Space Station (ISS).In this paper we introduce preliminary results obtained NEM.
This paper reviews the SEE (Single Event Effects) which have been observed on Japanese spacecraft in space since 1971, and summarizes in-orbit SEL Latch-up) SEU Upset) data for 10 years from 4 satellites. The is separated into solar maximum minimum periods Galactic Cosmic Ray (GCR) South Atlantic Anomaly (SAA) groupings. Heavy ion proton testing of same flight parts are reported. Prediction rates using CREME96 codes with heavy LET cross sections 2-parameter fits to section compared data. We...
Abstract Cosmic-ray neutron energy spectra from thermal to 15MeV were measured with a multimoderator spectrometer known as the Bonner Ball Neutron Detector (BBND) at aviation altitude (9–11 km). Four flights carried out around Nagoya Airport in Japan. The data unfolded using maximum entropy deconvolution code MAXED, and derived agreed calculated results PHITS-based analytical radiation model atmosphere (PARMA). of in-flight measurement verified accuracy calculation regard neutrons within...
We investigated the effect of hypervelocity impacts micrometeoroids and small-scale orbital space debris (M/OD) on structures by comparing numerical simulation results obtained using AUTODYN-2D hydrocode with experiments a two- stage light gas gun. The response an aluminum honeycomb structure to 6 km/s high-velocity is shown discussed. AUTODYN-2D, which used for impact analysis complex physical systems including fluid solid materials, was simulate at 2–15 km/s. Material models in allow...