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A global multispecies single-fluid MHD study of the plasma interaction around Venus
Russell, C. T.; Wei, H. Y.; Toth, G. +3 more
This paper reports a new global multispecies single-fluid MHD model that was recently developed for Venus. This model is similar to the numerical model that has been successfully applied to Mars. Mass densities of proton and three important ionospheric ion species (O+, O2+, and CO2+) are self-…
Hemispheric asymmetries of the Venus plasma environment
Kallio, E.; Jarvinen, R.; Dyadechkin, S.
We study the Venus-solar wind interaction and the hemispheric asymmetries of the Venus plasma environment in the global HYB-Venus hybrid simulation. We concentrate especially on the role of the flow-aligned interplanetary magnetic field (IMF) component (i.e., the Parker spiral angle or the IMF cone angle) and analyze the dawn-dusk and Esw
Plasma in the near Venus tail: Venus Express observations
Fedorov, A.; Barabash, S.; Lundin, R. +5 more
Although Venus has no global intrinsic magnetic fields, it possesses a long magnetotail of induced origin. The topology of the tail is determined by the interplanetary magnetic field orientation. We present recent plasma and magnetic field observations in the near Venus tail (X≥-3RV) made by the Venus Express spacecraft. We show that io…
Venus ion outflow estimates at solar minimum: Influence of reference frames and disturbed solar wind conditions
Barabash, S.; Zhang, T. L.; Nilsson, H. +2 more
Recent estimates of ion escape rates from Venus, based on ASPERA-4 data, differ by more than a factor of 4. Whereas the ASPERA-4 instrument provides state-of-the art observations, the limited field of view of the instrument and the strongly limited geographical coverage of the spacecraft orbit means that significant assumptions must be used in the…
Asymmetries of the magnetic field line draping shape around Venus
Kallio, E.; Zhang, T. L.; Wang, C. +1 more
The magnetic field data observed by Venus Express (VEX) from April 2006 to December 2009 are analyzed in order to describe the magnetic configuration around Venus. All the magnetic observations are organized in a coordinate system which is determined by the solar wind (SW) flow and the interplanetary magnetic field. By averaging and compiling the …
CO Cameron band and CO2+ UV doublet emissions in the dayglow of Venus: Role of CO in the Cameron band production
Bhardwaj, Anil; Jain, Sonal Kumar
The present study deals with the model calculations of CO Cameron band and CO2+ ultraviolet doublet emissions in the dayglow of Venus. The overhead and limb intensities of CO Cameron band and CO2+ UV doublet emissions are calculated for low, moderate, and high solar activity conditions. Using updated cross sections, the impact of different e-CO cr…
Solar wind-driven plasma fluxes from the Venus ionosphere
Barabash, S.; Lundin, R.; Zhang, T. L. +4 more
conducted with the ASPERA-4 instrument and the magnetometer of the Venus Express spacecraft show that the kinetic pressure of planetary O+ ion fluxes measured in the Venus wake can be significantly larger than the local magnetic pressure, and as a result, those ions are not solely being driven by magnetic forces but also by the kinetic …
Large amplitude nonlinear waves in Venus magnetosheath
Zhang, T. L.; Gedalin, M.; Balikhin, M. +1 more
Large-amplitude variations of the magnetic field in the Venusian magnetosheath are observed when the distance between the bow shock and the magnetic pileup boundary is small, of the order of the ion convective gyroradius. It is proposed that these oscillations are nonlinear standing waves. A theoretical model is developed within one-dimensional tw…
Intensities of the Venusian N2 electron-impact excited dayglow emissions
Fox, Jane L.; F. Hać, Nicholas E.
Dayglow emissions are signatures of both the energy deposition into an atmosphere and the abundances of the species from which they arise. The first N2 dayglow emissions from Mars, the (0,5) and (0,6) bands of the N2 Vegard-Kaplan band system, were detected by the Spectroscopy for Investigations of the Characteristics of the …