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Morphology of magnetic field in near-Venus magnetotail: Venus express observations

Barabash, S.; Futaana, Y.; Wei, Y. +7 more

Knowledge of the magnetic field morphology in the near-Venus wake is essential to the studies of magnetotail dynamics and the planetary plasma escape. In this study we use the magnetic field measurements made by Venus Express during the period of April 2006 to December 2012 to investigate the global magnetic field morphology in the near-Venus magn…

Transmission of large-amplitude ULF waves through a quasi-parallel shock at Venus

Zhang, Tielong; Wang, Shui; Huang, Can +4 more

There exist large-amplitude ultralow frequency (ULF) waves in the upstream region of a quasi-parallel shock, which are excited due to the reflected ions by the shock. These waves are then brought back to the shock by the solar wind, and at last they coalesce and merge with the shock. In this paper, with the magnetic field measurements from Venus E…

IMF control of the location of Venusian bow shock: The effect of the magnitude of IMF component tangential to the bow shock surface

Barabash, Stas; Zhang, Tielong; Rong, Zhaojin +7 more

The interplanetary magnetic field (IMF) frozen in the solar wind, together with the solar EUV radiation, can significantly affect the location of Venusian bow shock. To recognize the IMF effect on the Venusian bow shock, we investigated 1680 bow shock crossings recorded by Venus Express during the unusually long-lasting solar minimum (May 2006 to …

A survey of hot flow anomalies at Venus

Coates, A. J.; Fedorov, A.; Barabash, S. +10 more

We present the first survey of hot flow anomalies (HFAs) at the bow shock of Venus, expanding on our recent initial case study. A 3.06 sol (774 Earth day) survey of Venus Express magnetometer, ion spectrometer, and electron spectrometer data was undertaken in order to identify Cytherian HFAs. Seven events were discovered, corresponding to a statis…

Magnetic fields in the Venus ionosphere: Dependence on the IMF direction—Venus express observations

Woch, J.; Wei, Y.; Zhang, T. L. +2 more

The structure of the magnetized ionosphere of Venus is investigated using the magnetometer and plasma (Analyzer of Space Plasmas and Energetic Atoms 4) data from the Venus Express spacecraft. Observations surveying the low-altitude (h ≤ 250 km) ionosphere were made at solar zenith angles ≥ 75°. The magnetic field permeating the Venus ionosphere at…

The extension of ionospheric holes into the tail of Venus

Fedorov, A.; Barabash, S.; Holmström, M. +8 more

Ionospheric holes are Cytherian nightside phenomena discovered by the NASA Pioneer Venus Orbiter, featuring localized plasma depletions driven by prominent and unexplained enhancements in the draped interplanetary magnetic field. Observed only during solar maximum, the phenomenon remains unexplained, despite their frequent observation during the f…