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A rapid decrease of the hydrogen corona of Mars
Quemerais, E.; Bertaux, J. -L.; Chaufray, J. -Y. +4 more
Mars is believed to have lost much of its surface water 3.5 billion years ago, but the amounts that escaped into space and remain frozen in the crust today are not well known. Hydrogen atoms in the extended martian atmosphere, some of which escape the planet's gravity, can be imaged through scattered solar UV radiation. Hubble Space Telescope (HST…
Dynamic auroral storms on Saturn as observed by the Hubble Space Telescope
Brown, R. H.; Baines, K. H.; Dougherty, M. K. +14 more
We present observations of significant dynamics within two UV auroral storms observed on Saturn using the Hubble Space Telescope in April/May 2013. Specifically, we discuss bursts of auroral emission observed at the poleward boundary of a solar wind-induced auroral storm, propagating at ∼330% rigid corotation from near ∼01 h LT toward ∼08 h LT. We…
The long-term steady motion of Saturn's hexagon and the stability of its enclosed jet stream under seasonal changes
Hueso, R.; Sánchez-Lavega, A.; Rojas, J. F. +14 more
We investigate the long-term motion of Saturn's north pole hexagon and the structure of its associated eastward jet, using Cassini imaging science system and ground-based images from 2008 to 2014. We show that both are persistent features that have survived the long polar night, the jet profile remaining essentially unchanged. During those years, …