Search Publications

Modelling a multi-spacecraft coronal mass ejection encounter with EUHFORIA

Palmerio, E.; Temmer, M.; Poedts, S. +6 more

Context. Coronal mass ejections (CMEs) are a manifestation of the Sun's eruptive nature. They can have a great impact on Earth, but also on human activity in space and on the ground. Therefore, modelling their evolution as they propagate through interplanetary space is essential.
Aims: EUropean Heliospheric FORecasting Information Asset (EUHF…

Sulfuric acid vapor and sulfur dioxide in the atmosphere of Venus as observed by the Venus Express radio science experiment VeRa

Pätzold, M.; Bird, M. K.; Häusler, B. +4 more

The Venus Express radio science experiment VeRa provided more than 900 neutral atmospheric profiles between the years 2006 and 2014. About 800 of these could be used for an analysis of the radio signal absorption at X-Band (wavelength: 3.6 cm), which is mainly caused by sulfuric acid vapor within the Venus atmosphere. The absorptivity profiles wer…

Idunn Mons: Evidence for Ongoing Volcano-tectonic Activity and Atmospheric Implications on Venus

D'Incecco, P.; Filiberto, J.; López, I. +2 more

In 2010 the ESA Venus Express Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) instrument first observed 1 µm emissivity anomalies over the top and eastern flank of Idunn Mons (46° S; 146° W), a 200 km wide volcano located in Imdr Regio, a volcano-dominated large volcanic rise of Venus. The anomalies suggest the presence of chemica…

Venus upper atmosphere revealed by a GCM: II. Model validation with temperature and density measurements

Lefèvre, Franck; Lebonnois, Sebastien; Schubert, Gerald +5 more

An improved high resolution (96 longitude by 96 latitude points) ground-to-thermosphere version of the Institut Pierre-Simon Laplace (IPSL) Venus General Circulation Model (VGCM), including non-orographic gravity waves (GW) parameterization and fine-tuned non-LTE parameters, is presented here. We focus on the validation of the model built from a c…

Polar Vortices in Planetary Atmospheres

Teanby, Nicholas A.; Mitchell, Dann M.; Seviour, William J. M. +4 more

Among the great diversity of atmospheric circulation patterns observed throughout the solar system, polar vortices stand out as a nearly ubiquitous planetary-scale phenomenon. In recent years, there have been significant advances in the observation of planetary polar vortices, culminating in the fascinating discovery of Jupiter's polar vortex clus…

Venus Atmospheric Dynamics at Two Altitudes: Akatsuki and Venus Express Cloud Tracking, Ground-Based Doppler Observations and Comparison with Modelling

Widemann, Thomas; Machado, Pedro; Peralta, Javier +6 more

An Explanation of the Nightside Ionospheric Structure of Venus

Brecht, Stephen H.; Ledvina, Stephen A.

Hybrid simulations of Venus have produced nightside structure. It is believed these are the first simulations to produce the structure reported by spacecraft such as the Pioneer Venus Orbiter (PVO). The simulations reveal that the structure is created by the ▽P_e ambipolar electric field when it aligns with local IMF (interplanetary magn…

The Venus Express observation of Venus' induced magnetosphere boundary at solar maximum

Zhang, T. L.; Wang, X.; Rong, Z. J. +9 more

The Venusian plasma environment is divided into two distinct regions by the induced magnetosphere boundary (IMB): the domain of solar wind protons and the domain of local planetary ions. Previous studies on the identification of the IMB gave various IMB definitions. Here we study the well-structured Venusian IMB with a sudden magnetic field rotati…

Evidence for SO₂ latitudinal variations below the clouds of Venus

Bézard, B.; Marcq, E.; Amine, I. +1 more

Context. Sulphur dioxide (SO₂) is highly variable above the clouds of Venus, yet no spatial or temporal variability below the clouds had been known until now.
Aims: In order to constrain Venus's atmospheric circulation and chemistry (including possible volcanic outgassing), more accurate SO₂ measurements below the clouds…

Winds in the Lower Cloud Level on the Nightside of Venus from VIRTIS-M (Venus Express) 1.74 µm Images

Khatuntsev, Igor V.; Patsaeva, Marina V.; Zasova, Ludmila V. +2 more