A5028942359- Ionosphere and magnetosphere dynamics
- Atmospheric Ozone and Climate
- Solar and Space Plasma Dynamics
- Atmospheric and Environmental Gas Dynamics
- Earthquake Detection and Analysis
- Geophysics and Gravity Measurements
- Research Data Management Practices
- Atmospheric chemistry and aerosols
- Scientific Computing and Data Management
- Meteorological Phenomena and Simulations
- Geomagnetism and Paleomagnetism Studies
- Atmospheric aerosols and clouds
- GNSS positioning and interference
- Distributed and Parallel Computing Systems
- Methane Hydrates and Related Phenomena
- Climate variability and models
- Semantic Web and Ontologies
- Ocean Waves and Remote Sensing
- Calibration and Measurement Techniques
- Oceanographic and Atmospheric Processes
- Astro and Planetary Science
- Spectroscopy and Laser Applications
- Advanced Computational Techniques and Applications
- Planetary Science and Exploration
- Space exploration and regulation
National Institute of Information and Communications Technology
2012-2023
Université de Montpellier
2022
American Geophysical Union
2022
National Institute of Science and Technology Policy
2019
Research Institute for Humanity and Nature
2019
Science Council of Japan
2019
Integra (United States)
2017
Communications Technology Laboratory
2014
National Institute of Polar Research
2005-2007
Toyama Prefectural University
2005
The new Horizontal Wind Model (HWM07) provides a statistical representation of the horizontal wind fields Earth's atmosphere from ground to exosphere (0–500 km). It represents over 50 years satellite, rocket, and ground‐based measurements via compact Fortran 90 subroutine. computer model is function geographic location, altitude, day year, solar local time, geomagnetic activity. includes representations zonal mean circulation, stationary planetary waves, migrating tides, seasonal modulation...
Abstract. This paper presents extensive {bias determination} analyses of ozone observations from the Atmospheric Chemistry Experiment (ACE) satellite instruments: ACE Fourier Transform Spectrometer (ACE-FTS) and Measurement Aerosol Extinction in Stratosphere Troposphere Retrieved by Occultation (ACE-MAESTRO) instrument. Here we compare latest data products ACE-FTS ACE-MAESTRO with coincident nearly 20 satellite-borne, airborne, balloon-borne ground-based instruments, analysing volume mixing...
The Superconducting Submillimeter‐Wave Limb‐Emission Sounder (SMILES) was successfully launched and attached to the Japanese Experiment Module (JEM) on International Space Station (ISS) 25 September 2009. It has been making atmospheric observations since 12 October 2009 with aid of a 4 K mechanical cooler superconducting mixers for submillimeter limb‐emission sounding in frequency bands 624.32–626.32 GHz 649.12–650.32 . On basis observed spectra, data processing retrieving vertical profiles...
This paper describes the characteristics of mean winds, equatorial waves with periods ranging from 4 to 20 days, and diurnal tides determined by analyzing profiles wind velocity, temperature, humidity obtained every 5–7 hours in height range up about 35 km a resolution 150 m during an observation campaign conducted February 27 March 22, 1990, East Java, Indonesia. The structures winds troposphere lower stratosphere seemed be affected Australian monsoon quasi‐biennial oscillation,...
This paper discusses the characteristics of gravity waves in equatorial region revealed by analyzing radiosonde measurements wind velocity and temperature fluctuations at 0–35 km, with a height resolution 150 m, made every 5–7 hours between February 27 March 22, 1990, East Java, Indonesia. We conducted hodograph analysis to delineate vertical horizontal propagation found that most were generated middle troposphere they propagated upward into stratosphere. The amplitudes due larger...
We have regularly monitored mesospheric winds at 60–85km for three years with the MU radar (35°N, 136°E), and found that variance of wind velocity fluctuations periods from 5 min to 2 hr shows a semi‐annual variation significant peak in summer centered July irregular enhancements winter. The zonal momentum flux induced by gravity waves eastward westward maxima July–August December–February, respectively. Typical accelerations 70km altitude range 7 13 m/s/day −8 −11 winter, respectively,...
The vertical coupling of the stratosphere‐mesosphere system through quasi‐stationary and traveling planetary waves during major sudden stratospheric warming (SSW) in Arctic winter 2003/2004 has been studied using three types data. UK Met Office (UKMO) assimilated data set was used to examine features global‐scale disturbances present stratosphere Northern Hemisphere. Sounding Atmosphere Broadband Emission Radiometry (SABER) satellite measurements were as well for extracting stationary zonal...
In this paper we analyzed the seasonal variation of gravity wave activity in troposphere and lower stratosphere (5–25 km) as revealed by monthly observations with MU radar between December 1985 1989. stratosphere, wind velocity variance due to waves periods 5 min‐21 hours showed a clear annual maximum winter minimum summer, agreeing fairly well jet stream intensity. This suggests that excitation is closely related behavior background mean winds. The specific kinetic energy per unit volume...
Abstract. An ensemble of space-borne and ground-based instruments has been used to evaluate the quality version 2.2 temperature retrievals from Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS). The agreement ACE-FTS temperatures with other sensors is typically better than 2 K in stratosphere upper troposphere 5 lower mesosphere. There evidence a systematic high bias (roughly 3–6 K) mesosphere, possible low near 23 km. Some profiles exhibit unphysical oscillations,...
Abstract. This paper describes the algorithms of level-2 research (L2r) processing chain developed for Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES). The has been in parallel to operational conducting researches on calibration and retrieval algorithms. L2r products are available scientific community. objective version 2 is vertical distribution trace gases altitude range 18–90 km. A theoretical error analysis conducted estimate feasibility key parameters processing:...
[1] We present the first reported gravity wave patterns in mesopause region caused by a typhoon troposphere. On 10 December 2002, concentric rings of waves OH airglow were observed simultaneously all-sky imagers Optical Mesosphere and Thermosphere Imager system Japan, located at Rikubetsu (43.5°N, 143.8°E), Shigaraki (34.9°N, 136.1°E), Sata (31.0°N, 130.7°E). The structures, which well defined formed coherent pattern expanding concentrically, identified over 8 h (2135–2947 LT). We estimate...
Mean wind and gravity wave climatologies are presented for the polar mesosphere lower thermosphere (MLT). The data were derived using MF radars at Davis (69°S, 78°E) Syowa 40°E) in Antarctic Poker Flat (65°N, 147°W) Andenes (69°N, 16°E) Arctic. dynamics of MLT found to be significantly different from Arctic MLT. Summer maxima both westward equatorward winds occur closer solstice than greater symmetry around suggests radiative effects may play a role controlling state Arctic, where dynamical...
Abstract. The coupling of the dynamical regimes in high- and low-latitude stratosphere mesosphere during major SSW Arctic winter 2003/2004 has been studied. UKMO zonal wind data were used to explore latitudinal stratosphere, while was investigated by neutral measurements from eleven radars situated at high, high-middle tropical latitudes. It found that inverse relationship between variability mean flows related is produced global-scale zonally symmetric waves. Their origin other main...
Abstract A coherent 2-μm differential absorption and wind lidar (Co2DiaWiL) has been built with a high-power Q-switched Tm,Hm:YLF laser to measure CO2 concentration radial speed. The performance of the Co2DiaWiL is described analyzed, view demonstrating system capabilities for remote measurements velocities in atmospheric boundary layer free troposphere. Bias velocity was estimated at −0.0069 m s−1 using from stationary hard target. achieved precision 0.12 s−1, derived magnitude random error...
Abstract We present observational evidence of gravity wave ducting and show, for the first time, that occurs over large horizontal distances in mesopause region. An optical network four all‐sky imagers Japan identified two‐dimensional patterns small‐scale bands OH airglow images on 13 June 2004. The signatures clearly showed northward propagation more than 1800 km a wide range latitudes. wavelength, phase speed, period were estimated from data as 33.4 km, 42.8 m s −1 , 13.4 min,...
Tweek atmospherics are ELF/VLF pulse signals with frequency dispersion characteristics that originate from lightning discharges and propagate in the Earth-ionosphere waveguide mode over long distances. In this paper, we estimate equivalent nighttime electron densities at reflection heights D-region ionosphere low-middle latitudes by accurately reading first-order cut-off of tweek atmospherics. The estimation method was applied to received simultaneously Moshiri Kagoshima Japan. Equivalent...
Abstract. The Arctic MLT wind regime parameters measured at the ground-based network of MF and meteor radar stations (Andenes 69° N, Tromsø 70° Esrange 68° Dixon 73.5° Poker Flat 65° N Resolute Bay 75° N) are discussed compared with those observed in mid-latitudes. radars for measuring winds upper mesosphere lower thermosphere provides an excellent opportunity study main global dynamical structures this height region their dependence from longitude. Preliminary estimates differences between...
Mean winds and waves observed in the mesosphere lower thermosphere with MF radars located at Davis (69°S, 78°E) Poker Flat (65°N, 147°W) are compared. Measurements covering period from 1999 to mid 2000 show differences strength of horizontal wind fields. In southern hemisphere zonal meridional reach their maximum values near summer solstice, but delayed by 2–3 weeks northern hemisphere. Gravity wave variances also significant differences, as do vertical velocities.
In this paper, analysis of wind data detected by six ground‐based radar systems located in equatorial and midlatitude belts shows that a strong mesospheric 6.5‐day wave event occurred during April–May 2003. We compared the global distribution observed with theoretical structure (Rossby normal mode (s, n) = (1, −2)). Additionally, we investigated several important characteristics to understand event, i.e., period, vertical structure, relationship background wind, propagating direction, zonal...