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Using MARSIS signal attenuation to assess the presence of South Polar Layered Deposit subglacial brines

Orosei, Roberto; Caprarelli, Graziella; Pettinelli, Elena +7 more

Knowledge of the physical and thermal properties of the South Polar Layer Deposits (SPLD) is key to constrain the source of bright basal reflections at Ultimi Scopuli detected by the MARSIS (Mars Advanced Radar for Subsurface and Ionosphere Sounding) radar sounder. Here we present a detailed analysis of attenuation, based on data acquired by MARSI…

Alternate oscillations of Martian hydrogen and oxygen upper atmospheres during a major dust storm

Tsuchiya, Fuminori; Yoshida, Nao; Terada, Naoki +11 more

Dust storms on Mars play a role in transporting water from its lower to upper atmosphere, seasonally enhancing hydrogen escape. However, it remains unclear how water is diurnally transported during a dust storm and how its elements, hydrogen and oxygen, are subsequently influenced in the upper atmosphere. Here, we use multi-spacecraft and space te…