A5002410791- Ionosphere and magnetosphere dynamics
- Arctic and Antarctic ice dynamics
- Earthquake Detection and Analysis
- Meteorological Phenomena and Simulations
- Atmospheric Ozone and Climate
- Radar Systems and Signal Processing
- Radio Wave Propagation Studies
- Astro and Planetary Science
- Magnetic confinement fusion research
- Cryospheric studies and observations
- Solar and Space Plasma Dynamics
- Precipitation Measurement and Analysis
- Planetary Science and Exploration
- GNSS positioning and interference
- Advanced SAR Imaging Techniques
- Antenna Design and Optimization
- Methane Hydrates and Related Phenomena
- Plasma Diagnostics and Applications
- Seismic Waves and Analysis
- Geophysics and Gravity Measurements
- Atmospheric and Environmental Gas Dynamics
- Ship Hydrodynamics and Maneuverability
- Climate variability and models
- Ocean Waves and Remote Sensing
- Geomagnetism and Paleomagnetism Studies
Kyoto University
2002-2025
Kyoto Bunkyo University
2024-2025
Research Organization of Information and Systems
2007-2022
United Nations University Institute for Sustainability and Peace
2022
The Graduate University for Advanced Studies, SOKENDAI
2000-2021
National Institute of Polar Research
2012-2021
Research Institute for Sustainable Humanosphere
2021
Osaka City University
2017
Saitama Prefecture
2016
Electronic Navigation Research Institute
2003-2005
Abstract This study estimated the turbulent kinetic energy dissipation rates (TKEDRs) from 1‐year observations of Program Antarctic Syowa Mesosphere‐Stratosphere‐Troposphere/Incoherent Scatter radar (PANSY radar) October 2015 to September 2016 and compared results with estimates radiosonde measurements based on Thorpe's method. The radar‐based showed that TKEDR at Station was order 10 −5 –10 −3 m 2 /s 3 in altitude range 1.5–19 km. Taking proportional constant for method (the ratio Thorpe...
Abstract Prolonging the lifespan of timber structures requires early detection latent deterioration in wood coatings before visible damage occurs. This study combines attenuated total reflectance‐Fourier transform infrared (ATR‐FTIR) spectroscopy with partial least squares (PLS) regression to predict induced by accelerated weathering (xenon lamp method) waterborne acrylic varying concentrations cellulose nanofiber (CNF), an additive known suppress surface defects and discoloration....
The aim of this paper is to give an overview the monthly meteor head echo observations (528.8 h) conducted between 2009 June and 2010 December using Shigaraki Middle Upper atmosphere radar in Japan (34°.85 N, 136°.10 E). We present diurnal detection rates radiant density plots from 18 separate observational campaigns, each lasting for at least one cycle. Our data comprise more than 106 000 meteors. All six recognized apparent sporadic sources are discernable their average orbital...
The aim of this paper is to demonstrate the capabilities a new automated analysis scheme developed for meteor head echo observations by Shigaraki middle and upper atmosphere (MU) radar in Japan (N, E). Our procedure computes meteoroid range, velocity deceleration as functions time with unprecedented accuracy precision. This crucial estimations mass orbital parameters, well investigations into meteoroid–atmosphere interaction processes. We collected an extensive set data (>500 h) between...
Abstract. We have developed an automated analysis scheme for meteor head echo observations by the 46.5 MHz Middle and Upper atmosphere (MU) radar near Shigaraki, Japan (34.85° N, 136.10° E). The procedure computes meteoroid range, velocity deceleration as functions of time with unprecedented accuracy precision. This is crucial estimations mass orbital parameters well investigations meteoroid-atmosphere interaction processes. In this paper we present in detail. algorithms use a combination...
Abstract. The first observations made by a complete PANSY radar system (Program of the Antarctic Syowa MST/IS Radar) installed at Station (39.6° E, 69.0° S) were successfully performed from 16 to 24 March 2015. Over this period, quasi-half-day period (12 h) disturbances in lower mesosphere heights 70 80 km observed. Estimated vertical wavelengths, wave periods and phase velocities approximately 13.7 km, 12.3 h −0.3 m s−1, respectively. Under working hypothesis that such are attributable...
To investigate local carrier motions, we developed a dual-probe scanning near-field optical microscope (SNOM) with two fiber probes where one is for photoexcitation and the other light collection. This instrumentation based on important techniques: design of probe structures distance control between sample surface probes. A finite-difference time-domain method numerically analyzed optimized high efficiency collection, while dual band modulation realized control. Real time detection...
Abstract Characteristically strong vertical wind disturbances (VWDs) with magnitudes larger than 1 m s−1 were observed in the Antarctic troposphere using a new mesosphere–stratosphere–troposphere (MST) radar called Program of Syowa MST/incoherent scatter (IS) Radar (PANSY) during 15–19 June 2012 at Station (69.0°S, 39.6°E). In same period, two synoptic-scale cyclones approached and caused event (SWE) surface. The VWDs SWE had nearly standing (i.e., no phase tilt height) structure up to...
Abstract We report height and time variations in polar mesosphere winter echoes (PMWE) based on the Program of Antarctic Syowa mesosphere‐stratosphere‐troposphere/incoherent scatter (PANSY) radar observations. PMWE were identified for 110 days from March to September 2013. occurrence frequency increased abruptly May when two solar proton events occurred. also observed even during periods without any events, suggesting that a possible cause is ionization by energetic electron precipitations....
Abstract Aspect-sensitive backscattering of the atmosphere causes a small error in an effective line-of-sight direction vertical beam observations leading to serious degradation wind estimates due contamination by horizontal components. An adaptive beamforming technique for multichannel mesosphere–stratosphere–troposphere (MST) radar is presented, which makes it possible measure velocity with higher accuracy adaptively generating countersteered reception against off-vertically shifted echo...
Abstract. Clutter rejection is among the most important issues in radar signal processing, for which adaptive antenna technique can be a powerful means. Compared to other applications of antenna, however, atmospheric radars require strict conditions, have prevented application this technique; main beam pattern should not altered since target region defined by its shape. In particular, loss gain kept no more than about 0.5dB, order maintain high sensitivity system. Also, clutter from...
In order to measure the variance of wind velocity, which is contributed from turbulence, via radar observations, it necessary remove unwanted contribution strong horizontal velocity components through finite beamwidth radar. This effect referred as beam broadening. Although amount broadening has thus far been calculated based on approximating assumption that pattern rotationally symmetric and very low sidelobes, we need take a more theoretical approach radar-one does not have simple like...
The design and performance evaluation is presented of a partially adaptive array that suppresses clutter from low elevation angles in atmospheric radar observations. norm-constrained directionally constrained minimization power (NC-DCMP) algorithm has been widely used to suppress radars, because it can limit the signal-to-noise ratio (SNR) loss designated amount, which most important factor for radars. To angles, adding supplemental antennas have high response incoming directions considered...
Abstract We present the first and direct comparison between magnetospheric plasma waves polar mesosphere winter echoes (PMWE) simultaneously observed by conjugate observation with Arase satellite high‐power atmospheric radars in both hemispheres, namely, Program of Antarctic Syowa Mesosphere, Stratosphere, Troposphere/Incoherent Scatter Radar at Station (SYO; −69.00°S, 39.58°E), Antarctica, Middle Atmosphere Alomar System Andøya (AND; 69.30°N, 16.04°E), Norway. The PMWE were during 03–07 UT...
The eclosion gate in insect development is controlled by the circadian clock and hormonal cascade. To study mechanisms underlying gate, we examined eclosion-timing signals from clock, role of 20-hydroxyecdysone flesh fly, Sarcophaga crassipalpis. Phase responses rhythm were applying a low-temperature pulse day prior to first peak. A applied about 5.4 h before advanced an peak 0.9 h. This indicates that interval Zeitgeber (external environmental cues) input behavioral output 4.5 Signals...
The PANSY radar is the first Mesosphere-Stratosphere-Troposphere/Incoherent Scatter (MST/IS) in Antarctic. It a VHF monostatic pulse Doppler operating at 47 MHz, consisting of an active phased array 1,045 Yagi antennas and equivalent number transmit-receiver modules with total peak output power 500 kW. stage was installed Syowa Station (69°00'S, 39°35'E) early 2011, continuously 228 since April 2012. full system operation will start 2015. This paper reports project's scientific objectives,...
We investigated characteristics of mesosphere echoes over Syowa Station (69S) in the Antarctic, which were detected by Program Antarctic Mesosphere, Stratosphere and Troposphere/Incoherent Scatter (PANSY) radar (47 MHz) Medium Frequency (MF) (2.4 MHz).Winter from PANSY low altitude MF below approximately 70-75 km mostly coexisted, appearing during daytime as well for a few hours post sunset.Summer lower height region absent both observations, suggesting close relationship generation...
Abstract This study focuses on the one‐to‐one relationship between morphology of polar mesosphere winter echo (PMWE) and cosmic noise absorption (CNA) as determined by measurements made with a single atmospheric radar, Program Antarctic Syowa mesosphere‐stratosphere‐troposphere/incoherent scatter (PANSY) radar. CNA was calculated using level in radar signal data collected during May 2013, including solar proton event 23 May. Using PMWE common volume, their temporal variations relation were...
Abstract Strong meteor trail echoes are interferences in the wind velocity estimates made from mesosphere radar observations. Contaminated spectra detected by their discontinuity and removed at risk of greater fluctuations spectra, leading to a severe reduction signal-to-noise ratio (SNR) inaccurate for weak atmospheric echoes. This paper presents an adaptive signal processing technique suppression spectral contaminations The method is based on norm-constrained directionally constrained...
Radar observation is widely recognized as an essential technique to study the three-dimensional dynamics of atmosphere with a high temporal resolution. Conventional monostatic radar single aperture or array, however, has rather limited spatial This because this can only obtain radial component wind velocity, and thus it must observe at least three spatially separate target volumes estimate components vector. In paper, multistatic technique, which uses two receiver arrays together high-gain...