宇宙科学研究所研究者総覧

研究キーワード

太陽圏システム科学 ,惑星大気 ,宇宙プラズマ ,系外惑星

論文

Long‐Term Variability of Mean Winds and Planetary‐Scale Waves Around Venusian Cloud Top Observed With Akatsuki/UVI

Takeshi Horinouchi Toru Kouyama Masataka Imai Shin‐ya Murakami Yeon Joo Lee Atsushi Yamazaki Manabu Yamada Shigeto Watanabe Takeshi Imamura Javier Peralta Takehiko Satoh

Journal of Geophysical Research: Planets 2024年3月

Venus cloud discontinuity in 2022

J. Peralta A. Cidadão L. Morrone C. Foster M. Bullock E. F. Young I. Garate-Lopez A. Sánchez-Lavega T. Horinouchi T. Imamura E. Kardasis A. Yamazaki S. Watanabe

Astronomy & Astrophysics 672 L2-L2 2023年3月

Context. First identified in 2016 by the Japan Aerospace eXploration Agency (JAXA) Akatsuki mission, the discontinuity or disruption is a recurrent wave observed to propagate over decades at the deeper clouds of Venus (47–56 km above the surface),...

Mid-infrared laser heterodyne spectrometer by hollow optical fiber and its newly designed coupler

Hiromu Nakagawa Satoki Tsukada Takashi Katagiri Yasumasa Kasaba Isao Murata Yasuhiro Hirahara Yuji Matsuura Atsushi Yamazaki

Applied Optics 62(6) A31-A31 2023年1月

We demonstrate a newly designed, to the best of our knowledge, hollow optical fiber coupler for a mid-infrared (IR) laser heterodyne spectrometer that mixes a targeted light source with local oscillator (LO) light. The hollow fiber achieves a high...

Alternate oscillations of Martian hydrogen and oxygen upper atmospheres during a major dust storm.

Kei Masunaga Naoki Terada Nao Yoshida Yuki Nakamura Takeshi Kuroda Kazuo Yoshioka Yudai Suzuki Hiromu Nakagawa Tomoki Kimura Fuminori Tsuchiya Go Murakami Atsushi Yamazaki Tomohiro Usui Ichiro Yoshikawa

Nature communications 13(1) 6609-6609 2022年11月

Dust storms on Mars play a role in transporting water from its lower to upper atmosphere, seasonally enhancing hydrogen escape. However, it remains unclear how water is diurnally transported during a dust storm and how its elements, hydrogen and o...

Reflectivity of Venus’s Dayside Disk During the 2020 Observation Campaign: Outcomes and Future Perspectives

Yeon Joo Lee Antonio García Muñoz Atsushi Yamazaki Eric Quémerais Stefano Mottola Stephan Hellmich Thomas Granzer Gilles Bergond Martin Roth Eulalia Gallego-Cano Jean-Yves Chaufray Rozenn Robidel Go Murakami Kei Masunaga Murat Kaplan Orhan Erece Ricardo Hueso Petr Kabáth Magdaléna Špoková Agustín Sánchez-Lavega Myung-Jin Kim Valeria Mangano Kandis-Lea Jessup Thomas Widemann Ko-ichiro Sugiyama Shigeto Watanabe Manabu Yamada Takehiko Satoh Masato Nakamura Masataka Imai Juan Cabrera

The Planetary Science Journal 3(9) 209-209 2022年9月

Abstract

We performed a unique Venus observation campaign to measure the disk brightness of Venus over a broad range of wavelengths in 2020 August and September. The primary goal of the campaign was to investigate the absorption properties of th...