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Sökning: WFRF:(Rothery J)

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  • Milillo, A., et al. (författare)
  • Investigating Mercury's Environment with the Two-Spacecraft BepiColombo Mission
  • 2020
  • Ingår i: Space Science Reviews. - : Springer Science and Business Media LLC. - 0038-6308 .- 1572-9672. ; 216:5
  • Forskningsöversikt (refereegranskat)abstract
    • The ESA-JAXA BepiColombo mission will provide simultaneous measurements from two spacecraft, offering an unprecedented opportunity to investigate magnetospheric and exospheric dynamics at Mercury as well as their interactions with the solar wind, radiation, and interplanetary dust. Many scientific instruments onboard the two spacecraft will be completely, or partially devoted to study the near-space environment of Mercury as well as the complex processes that govern it. Many issues remain unsolved even after the MESSENGER mission that ended in 2015. The specific orbits of the two spacecraft, MPO and Mio, and the comprehensive scientific payload allow a wider range of scientific questions to be addressed than those that could be achieved by the individual instruments acting alone, or by previous missions. These joint observations are of key importance because many phenomena in Mercury's environment are highly temporally and spatially variable. Examples of possible coordinated observations are described in this article, analysing the required geometrical conditions, pointing, resolutions and operation timing of different BepiColombo instruments sensors.
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  • Smith, A., et al. (författare)
  • LunarEX-a proposal to cosmic vision
  • 2009
  • Ingår i: Experimental Astronomy. - : Springer Science and Business Media LLC. - 0922-6435 .- 1572-9508. ; 23:3, s. 711-740
  • Tidskriftsartikel (refereegranskat)
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  • Warell, Johan, et al. (författare)
  • Constraints on Mercury's surface composition from MESSENGER and ground-based spectroscopy
  • 2010
  • Ingår i: Icarus. - : Elsevier BV. - 0019-1035 .- 1090-2643. ; 209:1, s. 138-163
  • Tidskriftsartikel (refereegranskat)abstract
    • The composition and chemistry of Mercury's regolith has beets calculated from MESSENGER MASCS 0 3-1 3 mu m spectra from the first flyby, using an implementation of Hapke's radiative transfer-based photometric model for light scattering in semi-transparent porous media, and a linear spectral mixing algorithm We combine this investigation with linear spectral fitting results from mid-infrared spectra and compare derived oxide abundances with mercurian formation models and lunar samples Hapke modeling results indicate a regolith that is optically dominated by finely comminuted particles with average area weighted grain size near 20 pin Mercury shows lunar-style space weathering, with maturation-produced microphase iron present at similar to 0 065 wt% abundance, with only small variations between mature and immature sites, the amount of which is unable to explain Mercury's low brightness relative to the Moon The average modal mineralogies for the flyby 1 spectra derived from Hapke modeling are 35-70% Na-rich plagioclase or orthoclase, up to 30% Mg-rich clinopyroxene, <5% Mg-rich orthopyroxene, minute olivine, similar to 20-45% low-Fe, low-Ti agglutinitic glass, and <10% of one or more lunar-like opaque minerals Mercurian average oxide abundances derived from Hapke models and mid-infrared linear fitting include 40-50 wt% SiO2, 10-35 wt% Al2O3, 1-8 wt% FeO, and <25 wt% TiO2, the inferred rock type is basalt Lunar-like opaques or glasses with high Fe and/or Ti abundances cannot on their own, or in combination, explain Mercury's low brightness The linear mixing results indicate the presence of clinopyroxenes that contain up to 21 wt% MnO and the presence of a Mn-rich hedenbergite Mn in M1 crystalline lattice sites of hedenbergite suppresses the strong 1 and 2 mu m crystal field absorption bands and may thus act as a strong darkening agent on Mercury Also, one or more of thermally darkened silicates, Fe-poor opaques and matured glasses, or Mercury-unique Ostwald-ripened microphase iron nickel may lower the albedo A major part of the total microphase Iron present in Mercury's regolith is likely derived from FeO that is not intrinsic to the crust but has been subsequently delivered by exogenic sources.
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  • Resultat 1-6 av 6

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