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Solar Control of the Pickup Ion Plume in the Dayside Magnetosheath of Venus
Xu, Qi; Zuo, Pingbing; Xu, Xiaojun +3 more
Using the 8.5-year Venus Express measurements, we demonstrate the asymmetric plasma distributions in the Venusian magnetosheath. An escaping plume is formed by pickup oxygen ions in the hemisphere where the motional electric field points outward from Venus, while the velocity of solar wind protons is faster in the opposite hemisphere. The pickup O…
A Survey of Strong Electric Potential Drops in the Ionosphere of Venus
Zhang, Tielong; Futaana, Yoshifumi; Collinson, Glyn A. +6 more
Every planet or moon with an ionosphere is thought to generate a weak electrical potential which helps ions overcome gravity and escape to space. A pilot study at Venus by Collinson et al. (2016, https://doi.org/10.1002/2016GL068327) indicated a planetary potential an order of magnitude stronger t…
Shocklets and Short Large Amplitude Magnetic Structures (SLAMS) in the High Mach Foreshock of Venus
Raptis, Savvas; Karlsson, Tomas; Plaschke, Ferdinand +16 more
Shocklets and short large-amplitude magnetic structures (SLAMS) are steepened magnetic fluctuations commonly found in Earth's upstream foreshock. Here we present Venus Express observations from the 26th of February 2009 establishing their existence in the steady-state foreshock of Venus, building on a past study which found SLAMS during a substant…
Gravity Wave Modulations at the Lower Altitudes of Venus Ionosphere
Choudhary, R. K.; Imamura, T.; Ambili, K. M. +2 more
Using measurements from radio science experiments onboard Venus Express and Akatsuki orbiter, we explore factors that control the occurrence and spatial structure of the electron density enhancement at lower altitudes (V0 layer) in the Venus ionosphere. Results suggest that the Gravity Waves (GWs) play a crucial role in determining the …