Dr. Toru Kouyama
Planetary scientist (PhD: Planetary Science)
Remote-sensing Researcher
Affiliation: National Institute of Advanced Industrial Science and Technology (AIST)
Umezono 1-1-1, Tsukuba, 305-8568, Japan
E-mail: t.kouyama[at]aist.go.jp
Tel: +81-29-861-2506
Educational background
2012 – Ph.D. in Earth and planetary science, The University of Tokyo, Japan
2008 – M.S. in Earth and planetary science, The University of Tokyo, Japan
2006 – B.S. in Earth and planetary science, The University of Tokyo, Japan
Professional background
2012 – 2017, Researcher, National Institute of Advanced Industrial Science and Technology
2017 – Present, Senior Researcher, National Institute of Advanced Industrial Science and Technology
Research Areas
The main topic of my scientific interest has been dynamics of Planetary atmosphere.
Investigation of atmospheric circulation with an automated cloud tracking technique
Investigation of thermal structure of Venus cloud top using ground-based observation and satellite data.
Participating Japanese Venus orbiter mission, Akatsuki, as a research scientist.
The main themes of my research job have been sensor calibration in space and satellite operation.
Developing Lunar calibration scheme using hyperspectral reflectance data
Application of Lunar calibration for future Earth observation/small satellite missions and planetary missions (Hayabusa2)
Operating a small satellite "UNIFORM-1", and developing new data processing schemes useful for small satellites
Contributing satellite missions success (ex: Akatsuki, Hayabusa2, MMX)
Selected Publications
Sensor Calibration (Lunar Calibration / Distortion)
(New!) Post-arrival calibration of Hayabusa2's optical navigation cameras (ONCs): Severe effects from touchdown events, T. Kouyama, E. Tatsumi, Y. Yokota, K. Yumoto et al., Icarus, 360, 2021.
Lunar Calibration for ASTER VNIR and TIR with Observations of the Moon in 2003 and 2017. T. Kouyama ,S. Kato ,M. Kikuchi ,F. Sakuma ,A. Miura ,T. Tachikawa, S. Tsuchida, K. Obata and R. Nakamura, Remote Sensing, 11, 2712.
Development of an application scheme for the SELENE/SP lunar reflectance model for radiometric calibration of hyperspectral and multispectral sensors. T. Kouyama, Y. Yokota, Y. Ishihara, R. Nakamura, S. Yamamoto, T. Matsunaga, Planetary Space Science, 124, 76-83, 2016.
A method to estimate optical distortion using planetary images. T. Kouyama, A. Yamazaki, M. Yamada, T. Imamura, Planet. Space Sci., 86, 86-90, 2013.
Satellite operation
Automated Attitude Determination for Pushbroom Sensors Based on Robust Image Matching, R. Sugimoto, T. Kouyama, A. Kanemura, S. Kato, N. Imamoglu, R. Nakamura, Remote Sensing, 10(10), 1629, 2018.
Satellite Attitude Determination and Map Projection Based on Robust Image Matching. T. Kouyama, A. Kanemura, S. Kato, N. Imamoglu, T. Fukuhara, and R. Nakamura, Remote sensing, 9(1), 90, 2017.
Planetary science (Venus atmospheric science)
Global Structure of Thermal Tides in the Upper Cloud Layer of Venus Revealed by LIR on Board Akatsuki. T. Kouyama, et al., Geophysical Research Letters, 46, 2019.
Topographical and Local Time Dependence of Large Stationary Gravity Waves Observed at the Cloud Top of Venus. T. Kouyama, et al., Geophysical Research Letters, 44, 2017.
Vertical propagation of planetary-scale waves in variable background winds in the upper cloud region of Venus. T. Kouyama, T. Imamura, M. Nakamura, T Satoh, Y. Futaana, Icarus, 248, 560-568, 2015.
Long-term variation in the cloud-tracked zonal velocities at the cloud top of Venus deduced from Venus Express VMC images. T. Kouyama, T. Imamura, M. Nakamura, T Satoh, Y. Futaana, J. Geophys. Res., 118, 37-46, 2013.
Horizontal structure of planetary-scale waves at the cloud top of Venus deduced from Galileo SSI images with an improved cloud-tracking technique. T. Kouyama, T. Imamura, M. Nakamura, T Satoh, Y. Futaana, Planet. Space Sci., 60, 207-216, 2012.
Automated cloud tracking system for the Akatsuki Venus Climate Orbiter data. K. Ogohara, T. Kouyama，H. Yamamoto, N. Satoh, M. Takagi, T. Imamura, Icarus, 217, 661-668, 2012.
Awards
NASA Group Achievement Award: ASTER Lunar Calibration team