Japan Geoscience Union Meeting 2021

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[E] Oral

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

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

Fri. Jun 4, 2021 3:30 PM - 4:50 PM Ch.02 (Zoom Room 02)

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

3:30 PM - 3:50 PM

[PPS01-06] Observations of tenuous atmospheres at Jupiter’s icy Galilean moons: HST and future missions

★Invited Papers

*Lorenz Roth1 (1.KTH Royal Institute of Technology, Space and Plasma Physics, Stockholm, Sweden)

Keywords:Jupiter, Galilean moons, satellite atmospheres, Hubble Space Telescope, Jupiter moon missions

In this presentation, the UV observations by the Hubble Space Telescope (HST) of the tenuous atmospheres of Jupiter’s large icy moons are reviewed. We discuss the previous detections of O2 at Europa and Ganymede through auroral emissions and at Callisto through photo-electron emissions. In addition, we show new results from the HST data that reveal the presence of sublimated H2O atmospheres in the sub-solar region in addition to O2. HST also 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.