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Active volcanism on Venus in the Ganiki Chasma rift zone

Head, J. W.; Ignatiev, N. I.; Basilevsky, A. T. +3 more

Venus is known to have been volcanically resurfaced in the last third of solar system history and to have undergone a significant decrease in volcanic activity a few hundred million years ago. However, fundamental questions remain: Is Venus still volcanically active today, and if so, where and in what geological and geodynamic environment? Here we…

Venus's major cloud feature as an equatorially trapped wave distorted by the wind

Sánchez-Lavega, A.; López-Valverde, M. A.; Machado, P. +2 more

The superrotation of the atmospheres of slowly rotating bodies is a long-standing problem yet unsolved in atmospheric dynamics. On Venus, the most extreme case known of superrotation, this is accompanied and influenced by a recurrent planetary-scale cloud structure, known as the Y feature. So far, no model has simultaneously reproduced its shape, …

A new mechanism for OH vibrational relaxation leading to enhanced CO₂ emissions in the nocturnal mesosphere

Sharma, Ramesh D.; Wintersteiner, Peter P.; Kalogerakis, Konstantinos S.

On the basis of experimental and theoretical studies, this paper proposes a new mechanism that contributes to nocturnal 4.3 µm CO₂ emissions. It suggests that collisions of ground state O atoms with highly vibrationally excited OH(v), produced by the reaction of H with O₃, remove a substantial fraction of the OH(v) vibrationa…

Momentum transfer from solar wind to interplanetary field enhancements inferred from magnetic field draping signatures

Lai, H. R.; Russell, C. T.; Jia, Y. D. +2 more

Characterized by a cusp-shaped enhancement in the magnetic field strength, the magnetic structure in the solar wind, called an interplanetary field enhancement (IFE), has been investigated since its discovery. To understand its three-dimensional magnetic field geometry, we study an IFE detected by five spacecraft simultaneously. Field lines are se…