Search Publications
Oxygen airglow emission on Venus and Mars as seen by VIRTIS/VEX and OMEGA/MEX imaging spectrometers
Bibring, J. -P.; Gondet, B.; Bellucci, G. +8 more
Imaging spectrometers are highly effective instruments for investigation of planetary atmospheres. They present the advantage of coupling the compositional information to the spatial distribution, allowing simultaneous study of chemistry and dynamics in the atmospheres of Venus and Mars. In this work, we summarize recent results about the O 2…
ROY—A multiscale magnetospheric mission
Novikov, D.; Kozak, L.; Amata, E. +21 more
The scientific rationale of the ROY multi-satellite mission addresses multiscale investigations of plasma processes in the key magnetospheric regions with strong plasma gradients, turbulence and magnetic field annihilation in the range from electron inertial length to MHD scales. The main scientific aims of ROY mission include explorations of:
MHD-instability of the magnetotail: Global modes
Leonovich, A. S.
A hydromagnetic stability problem is solved for the magnetospheric tail inside the solar wind plasma flow. A model magnetotail is used in the form of a plasma cylinder which is inhomogeneous over the radius. For a qualitative analysis of the problem the solution is obtained analytically, in the WKB approximation. The plasma cylinder boundary is as…
Hydroxyl airglow on Venus in comparison with Earth
Drossart, P.; Piccioni, G.; Migliorini, A. +1 more
Hydroxyl nightglow is intensively studied in the Earth atmosphere, due to its coupling to the ozone cycle. Recently, it was detected for the first time also in the Venus atmosphere, thanks to the VIRTIS-Venus Express observations. The main Δ ν=1, 2 emissions in the infrared spectral range, centred, respectively, at 2.81 and 1.46 µm (which co…
Scaling law of the reduced magnetic helicity in fast streams
Perri, S.; Balogh, A.; Bruno, R. +2 more
The reduced magnetic helicity is a quantity related to the handedness of the magnetic field fluctuations. In the present paper we study the scaling law of the reduced magnetic helicity in fast streams in the solar wind by using high-resolution magnetic field data by the Ulysses spacecraft. We show that at high frequencies both the left-hand and th…
On turbulence in the quasi-perpendicular bow shock
Meziane, K.; Hamza, A. M.
In this paper we propose to review the fundamental aspects of turbulence theories and their relevance to particle distribution functions observed by the cluster satellites in the quasi-perpendicular shock. The paper focusses on the hierarchical model describing the different levels of plasma turbulence; from the linear theory, through the quasi-li…
Comparative investigation of the terrestrial and Venusian magnetopause: Kinetic modeling and experimental observations by Cluster and Venus Express
Barabash, S.; Lundin, R.; Zhang, T. L. +4 more
In June 2006 Venus Express crossed several times the outer boundary of Venus induced magnetosphere, its magnetosheath and its bow shock. During the same interval the Cluster spacecraft surveyed the dawn flank of the terrestrial magnetosphere, intersected the Earth's magnetopause and spent long time intervals in the magnetosheath. This configuratio…
Dispersive MHD turbulence in one dimension
Passot, T.; Sulem, P. L.; Laveder, D. +1 more
Numerical simulations of dispersive turbulence in magnetized plasmas based on the Hall-MHD description are presented, assuming spatial variations along a unique direction making a prescribed angle with the ambient magnetic field. Main observations concern the energy transfers among the different scales and the various types of MHD waves, together …
Comparative planetology, climatology and biology of Venus, Earth and Mars
Taylor, F. W.
Spacecraft studies of the three terrestrial planets with atmospheres have made it possible to make meaningful comparisons that shed light on their common origin and divergent evolutionary paths. Early in their histories, all three apparently had oceans and extensive volcanism; Mars and Earth, at least, had magnetic fields, and Earth, at least, had…
Integrating advanced visualization technology into the planetary Geoscience workflow
Dickson, James; Huffman, John; Forsberg, Andrew +3 more
Recent advances in computer visualization have allowed us to develop new tools for analyzing the data gathered during planetary missions, which is important, since these data sets have grown exponentially in recent years to tens of terabytes in size. As part of the Advanced Visualization in Solar System Exploration and Research (ADVISER) project, …