JpGU-AGU Joint Meeting 2020

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[E] Oral

P (Space and Planetary Sciences ) » P-PS Planetary Sciences

[P-PS01] Outer Solar System Exploration Today, and Tomorrow

convener:Jun Kimura(Osaka University), Kunio M. Sayanagi(Hampton University), Fuminori Tsuchiya(Planetary Plasma and Atmospheric Research Center, Graduate School of Science, Tohoku University), Steven Douglas Vance(NASA Jet Propulsion Laboratory, California Institute of Technology)

[PPS01-04] Observations of tenuous atmospheres and plumes at the icy Galilean moons: HST and future missions

★Invited Papers

*Lorenz Roth1 (1.KTH Royal Institute of Technology, Stockholm, Sweden)

Keywords:Jupiter, Icy moons, Hubble Space Telescope, JUICE, Europa Clipper

In this presentation, we review the UV observations by the Hubble Space Telescope (HST) of the tenuous atmospheres of Jupiter’s large icy moons. The detections of the O2 atmospheres at Europa and Ganymede through auroral emissions and at Callisto through photo-electron emissions are discussed and compared. In addition to the O2 atmospheres, HST discovered atomic hydrogen coronae at all three moons and measured localized H and O atomic emissions at Europa, interpreted as first evidence for the existence of plumes. At the end, we give an overview on future measurements of the icy moon atmospheres by ESAs JUpiter Icy Moon Explorer (JUICE) and NASAs Europa Clipper mission, with focus on the UVS instruments.