Masunaga, K.   Yoshioka, K.   Chaffin, M.S.   Deighan, J.   Jain, S.K.   Schneider, N.M.   Kimura, T.   Tsuchiya, F.   Murakami, G.   Yamazaki, A.   Terada, N.   Yoshikawa, I.   
Journal of Geophysical Research: Planets 125(12) 2020年
We present variations of oxygen 130.4 nm and hydrogen Ly-β airglow of the Martian upper atmosphere observed by the Hisaki spacecraft in the Earth orbit. In 5-year intermittent observations covering various Mars seasons, the 130.4 nm brightness var...
Persson, M.   Futaana, Y.   Ramstad, R.   Masunaga, K.   Nilsson, H.   Hamrin, M.   Fedorov, A.   Barabash, S.   
Journal of Geophysical Research: Planets 125(3) 2020年
The present atmosphere of Venus contains almost no water, but recent measurements indicate that in its early history, Venus had an Earth-like ocean. Understanding how the Venusian atmosphere evolved is important not only for Venus itself but also ...
Nara, Y.   Imamura, T.   Masunaga, K.   Lee, Y.J.   Terada, N.   Yoshioka, K.   Yamazaki, A.   Seki, K.   Yoshikawa, I.   Yamada, M.   Watanabe, S.   
Journal of Geophysical Research: Planets 125(3) 2020年
Analyzing data from the Ion Composition Analyzer on board the Rosetta spacecraft, we studied a flow pattern of accelerated cometary ions (40-80 eV) inside and outside the diamagnetic cavity of comet 67P/Churyumov-Gerasimenko (67P). We found that t...
Masunaga, K.   Futaana, Y.   Persson, M.   Barabash, S.   Zhang, T.L.   Rong, Z.J.   Fedorov, A.   
Icarus 321 379-387 2019年
We investigate dependences of O+ escape rates from Venus both on the solar wind and the solar extreme ultraviolet (EUV) flux by using the 8.5-year dataset (May 2006 to December 2014) of the Ion Mass Analyzer and the magnetometer aboard Venus Expre...