Associate Professor Hideo Sagawa

Area and Subject Taught Remote sensing of planetary atmosphere
Research Theme(s) Observational study of planetary atmosphere
Academic Degrees Ph. D., University of Tokyo.
Keywords for Research Field Planetary atmosphere, Planetary science, remote sensing, radiative transfer
Office Phone Number Not Public
e-mail E-mail

Research Overview

I’m working on the remote sensing of the planetary atmosphere. Most of the planets on our solar system have atmospheres (even small moons have some “tenuous” atmospheres), and those atmospheres are known to play several key roles in determining the planet’s physical and chemical conditions.
The first step to understand planetary atmosphere is to observe it. And we have various approaches (or, tools) for that: using ground-based telescopes, or developing spacecraft onboard instruments; taking images of clouds, or using spectroscopy to spectrally resolve the emission from atmosphere; with visible wavelengths, or infrared, microwave wavelengths, etc.
These various observational methodologies are highly complementary.

Notable Publications and Works in the Last Three Years

  • Lee, Y. J., Sagawa, H., Haus, R., Stefani, S., Imamura, T., Titov, D. V. and Piccioni, G. (2016); “Sensitivity of net thermal flux to the abundance of trace gases in the lower atmosphere of Venus”, Journal of Geophysical Research: Planets 121, pp. 1737-1752.
  • Aoki, S., Nakagawa, H., Sagawa, H., Giuranna, M., Sindoni, G., Aronica, A. and Kasaba, Y.(2015); “Seasonal variation of the HDO/H2O ratio in the atmosphere of Mars at the middle of northern spring and beginning of northern summer”, Icarus 260, pp. 7-22.
  • Sato, T.M., Sagawa, H., Kouyama, T., Mitsuyama, K., Satoh, T., Ohtsuki, S., Ueno, M., Kasaba, Y., Nakamura, M., and Imamura, T. (2014); “Cloud top structure of Venus revealed by Subaru/COMICS mid-infrared images”, Icarus 243, pp. 386-399.