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A strong seasonal dependence in the Martian hydrogen exosphere
Bertaux, Jean-Loup; Chaufray, Jean-Yves; Clarke, John T. +2 more
Hubble Space Telescope and Mars Express observed unexpected rapid changes in the Martian hydrogen exosphere involving a decrease in scattered Lyman α intensity in fall 2007 (solar longitude, Ls = 331°-345°). These changes detected were speculated to be a combination of seasonal variation and/or dust storms and lower atmospheric dynamics…
Transient internally driven aurora at Jupiter discovered by Hisaki and the Hubble Space Telescope
Hasegawa, H.; Fujimoto, M.; Masters, A. +12 more
Jupiter's auroral emissions reveal energy transport and dissipation through the planet's giant magnetosphere. While the main auroral emission is internally driven by planetary rotation in the steady state, transient brightenings are generally thought to be triggered by compression by the external solar wind. Here we present evidence provided by th…