Processes that Promote and Deplete the Exosphere of Mercury

  title={Processes that Promote and Deplete the Exosphere of Mercury},
  author={Rosemary Margaret Killen and G. Cremonese and Helmut Lammer and Stefano Orsini and Andrew E. Potter and Ann L. Sprague and Peter Wurz and M. L. Khodachenko and Herbert I. M. Lichtenegger and Anna Milillo and Alessandro Mura},
  journal={Space Science Reviews},
Abstract It has been speculated that the composition of the exosphere is related to the composition of Mercury’s crustal materials. If this relationship is true, then inferences regarding the bulk chemistry of the planet might be made from a thorough exospheric study. The most vexing of all unsolved problems is the uncertainty in the source of each component. Historically, it has been believed that H and He come primarily from the solar wind (Goldstein, B.E., et al. in J. Geophys. Res. 86:5485… Expand
Modelling of Mercury’s surface composition and remote detection from the orbit with the BepiColombo Mercury Planetary Orbiter
It can be assumed that the composition of Mercury’s thin gas envelope (exosphere) is related to the composition of the planets crustal materials. If this relationship is true, then inferencesExpand
Thermal and solar weathering of Mercury's crust
Mercury MESSENGER aims to map the composition of the Mercurian crust. This composition has direct implications for the formation and evolution of the planet [4]. The instruments that willExpand
Pathways for energization of Ca in Mercury’s exosphere
Abstract We investigate the possible pathways to produce the extreme energy observed in the calcium exosphere of Mercury. Any mechanism must explain the facts that Ca in Mercury’s exosphere isExpand
Global circulation model of its sodium component
Our understanding of Mercury’s sodium exosphere has improved considerably in the last 5 years thanks to new observations (Schleicher, H., Wiedemann, G., Wöhl, H., Berkefeld, T., Soltau, D. [2004].Expand
Planet Mercury : volatile release on a contracting world
This thesis investigates the geological processes by which materials containing high concentrations of volatile substances have been delivered to the surface of the planet Mercury throughout itsExpand
Limits to Mercury's magnesium exosphere from MESSENGER second flyby observations
Abstract The discovery measurements of Mercury's exospheric magnesium, obtained by the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) probe during its second Mercury flyby,Expand
Insights into the Nature of Mercury's Exosphere: Early Results from the MESSENGER Orbital Mission Phase
Abstract The Ultraviolet and Visible Spectrometer aboard the MESSENGER spacecraft has been making routine observations of Mercury's exosphere since March 29, 2011. Correlations of the spatialExpand
Investigation of the possible effects of comet Encke's meteoroid stream on the Ca exosphere of Mercury
The MESSENGER observations of the seasonal variability of Mercury's Ca-exosphere are consistent with the general idea that the Ca-atoms originate from the bombardment of the surface by particles fromExpand
The sodium exosphere of Mercury: Comparison between observations during Mercury's transit and model results
Abstract In this study we compare the sodium exosphere observations made by Schleicher et al. [Schleicher, H., and 4 colleagues, 2004. Astron. Astrophys. 425, 1119–1124] with the result of a detailedExpand
Investigating potential sources of Mercury's exospheric Calcium: Photon‐stimulated desorption of Calcium Sulfide
Ground-based and MErcury Surface, Space ENvironment, GEochemistry, and Ranging observations detected Ca0 and Ca+ in the exosphere of Mercury as well as unexpectedly high levels of sulfur on Mercury'sExpand


Source processes for the alkali metals in the atmosphere of Mercury
A large (fivefold) increase in Mercury's potassium(K) column abundance on 14 October 1987, has been reported by Sprague et al.[199O](SKH), who attributed the enhancement to diffusion through theExpand
A non-stoichiometric model of the composition of the atmospheres of Mercury and the Moon
Abstract The likely source fluxes, atmospheric column densities, and UV irradiances have been predicted of a number of species likely to be found in Mercury's exosphere which should be derived fromExpand
Spectra of extremely reduced assemblages: Implications for Mercury
We investigate the possibility that Mercury's crust is very reduced with FeO concentrations of less than ∼0.1 wt%. We believe that such a surface could have a composition of enstatite, plagioclase,Expand
The contribution of impulsive meteoritic impact vapourization to the Hermean exosphere
Abstract The exosphere of Mercury has been the object of many investigations and speculations regarding its composition, formation, depletion and dynamics. While vapourization of Mercurian surfaceExpand
Discovery of calcium in Mercury's atmosphere
The localized distribution and high temperature suggest that the atmospheric calcium may arise from surface sputtering by ions, which enter Mercury's auroral zone, and the low abundance of atmospheric Ca may indicate that the regolith is rarefied in calcium. Expand
The calcium exosphere of Mercury
Abstract A tenuous calcium atmosphere at Mercury, principally seen in the polar regions, was first observed in July, 1998, using the High Resolution Echelle Spectrograph (HIRES) at the W.M. Keck IExpand
The surface‐bounded atmospheres of Mercury and the Moon
Surface-bounded exospheres have been detected at the Moon, Mercury, and Europa and almost certainly exist about other objects. Historically, the first of these systems to be observed was the lunarExpand
Observations of Mercury's exosphere: Spatial distributions and variations of its Na component during August 8, 9 and 10, 2003
Following the observations of August 2002 [Barbieri, C., Verani, S., Cremonese, G., Sprague, A., Mendillo, M., Cosentino, R., Hunten, D., 2004. Planet. Space Sci. 52, 1169–1175], the high resolutionExpand
A Bx-interconnected magnetosphere model for Mercury
Abstract The access of solar wind plasma to the surface of Mercury depends on the magnetic fields in the vicinity of the planet. We present the structure of the Hermean magnetosphere obtained by theExpand
Surface-Exosphere-Magnetosphere System Of Mercury
Mercury is a poorly known planet, since the only space-based information comes from the three fly-bys performed in 1974 by the Mariner 10 spacecraft. Ground-based observations also provided someExpand