Search Publications
Isolated magnetic field structures in Mercury's magnetosheath as possible analogues for terrestrial magnetosheath plasmoids and jets
Karlsson, Tomas; Raines, Jim M.; Liljeblad, Elisabet +3 more
We have investigated MESSENGER magnetic field data from the Mercury magnetosheath and near solar wind, to identify isolated magnetic field structures (defined as clear, isolated changes in the field magnitude). Their properties are studied in order to determine if they may be considered as analogues to plasmoids and jets known to exist in Earth's …
Access of energetic particles to Titan's exobase: A study of Cassini's T9 flyby
Coates, A. J.; Krupp, N.; Dougherty, M. K. +6 more
We study how the local electromagnetic disturbances introduced by Titan affect the ionization rates of the atmosphere. For this, we model the precipitation of energetic particles, specifically hydrogen and oxygen ions with energies between 1 keV and 1 MeV, into Titan's exobase for the specific magnetospheric configuration of the T9 flyby. For the …
A classification of martian gullies from HiRISE imagery
Auld, Katherine S.; Dixon, John C.
Due to the large and varied population of gullies observed in Mars High Resolution Imaging Science Experiment (HiRISE) imagery that exhibit diverse characteristics, this paper develops a classification of martian gullies based on their morphological characteristics. This provides a firmer foundation for future investigation of the genesis of diffe…
Dynamics of planetary ions in the induced magnetospheres of Venus and Mars
Luhmann, J. G.; Brain, D. A.; Jarvinen, R.
We compare dynamics of planetary ions in the induced magnetospheres of Venus and Mars in a global hybrid simulation to study factors controlling the ion escape at unmagnetized planets. In the simulation we find that the finite Larmor radius (FLR) effects of escaping heavy ions are stronger at Mars than Venus under nominal solar wind conditions. Bu…
Martian surface microtexture from orbital CRISM multi-angular observations: A new perspective for the characterization of the geological processes
Schmidt, F.; Douté, S.; Fernando, J.
The surface of Mars has a high morphological and mineralogical diversity due to the intricacy of external, internal processes, and exchanges with the atmosphere, the hydrosphere and the cryosphere. In particular, liquid water played an important role in surface evolution. However, the origin, duration and intensity of those wet events have been hi…
The daily processing of asteroid observations by Gaia
Muinonen, Karri; Fedorets, Grigori; Pentikäinen, Hanna +15 more
The Gaia mission started its regular observing program in the summer of 2014, and since then it is regularly obtaining observations of asteroids. This paper draws the outline of the data processing for Solar System objects, and in particular on the daily ;short-term; processing, from the on-board data acquisition to the ground-based processing. We…
Separation of dynamic and isostatic components of the Venusian gravity and topography and determination of the crustal thickness of Venus
Yang, An; Huang, Jinshui; Wei, Daiyun
Assuming that the long-wavelength geoid and topography of Venus are supported by both mantle convection and Airy isostasy, we propose a method to separate the dynamic and isostatic components of the Venusian gravity and topography with the aid of the dynamic admittance from numerical models of mantle convection and the isostatic admittance from an…
A comprehensive analysis of ion cyclotron waves in the equatorial magnetosphere of Saturn
Simon, Sven; Kabanovic, Slawa; Meeks, Zachary
We present a comprehensive analysis of ion cyclotron waves in the equatorial magnetosphere of Saturn, considering all magnetic field data collected during the Cassini era (totaling to over 4 years of data from the equatorial plane). This dataset includes eight targeted flybys of Enceladus, three targeted flybys of Dione, and three targeted flybys …
Systematic processing of Mars Express HRSC panchromatic and colour image mosaics: Image equalisation using an external brightness reference
Jaumann, R.; van Gasselt, S.; Dumke, A. +8 more
After more than ten years in orbit at Mars, the coverage from the High Resolution Stereo Camera (HRSC) on the European Space Agency's Mars Express is sufficient to begin constructing mosaic products on a global scale. We describe our systematic processing procedure and, in particular, the technique used to bring images affected by atmospheric dust…
Polarimetry observations of comets: Status, questions, future pathways
Hines, Dean C.; Levasseur-Regourd, Anny-Chantal
Polarimetric observations of comets have provided crucial insight into the composition and evolution of cometary dust particles. Herein, we present a brief overview of the polarization properties observed in comets, and some possible interpretations. We also discuss recent imaging polarimetry observations of C/2012 S1 (ISON) and 67P/Churyumov-Gera…