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  • 1
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    3-D Hybrid Kinetic Modeling of the Interaction Between the Solar Wind and Lunar-like Exospheric Pickup Ions in Case of Oblique/ Quasi-Parallel/Parallel Upstream Magnetic Field (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The interactions between the solar wind and Moon-sized objects are determined by a set of the solar wind parameters and plasma environment of the space objects. The orientation of upstream magnetic field is one of the key factors which determines the formation and structure of bow shock wave/Mach cone or Alfven wing near the obstacle. The study of effects of the direction of the upstream magnetic field on lunar-like plasma environment is the main subject of our investigation in this paper. Photoionization, electron-impact ionization and charge exchange are included in our hybrid model. The computational model includes the self-consistent dynamics of the light (hydrogen (+), helium (+)) and heavy (sodium (+)) pickup ions. The lunar interior is considered as a weakly conducting body. Our previous 2013 lunar work, as reported in this journal, found formation of a triple structure of the Mach cone near the Moon in the case of perpendicular upstream magnetic field. Further advances in modeling now reveal the presence of strong wave activity in the upstream solar wind and plasma wake in the cases of quasiparallel and parallel upstream magnetic fields. However, little wave activity is found for the opposite case with a perpendicular upstream magnetic field. The modeling does not show a formation of the Mach cone in the case of theta(Sub B,U) approximately equal to 0 degrees.
    Keywords: Astrodynamics
    Type: GSFC-E-DAA-TN21312 , Advances in Space Research (ISSN 0273-1177)
    Format: application/pdf
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  • 2
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    The Moon as a Science Platform (2012)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Moon offers a valuable platform for space sciences studies: (1) No atmosphere, (2) Farside is radio quiet. There is a compelling science program: (1) Cosmic dawn and the dark ages, (2) Particle acceleration and space weather. The technology and engineering development are making good progress. A staged roadmap with science and technology development at every step is presented.
    Keywords: Astronomy
    Type: European Lunar Symposium; Apr 18, 2012 - Apr 20, 2012; Berlin; Germany
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Lunar Radio Telescopes: A Staged Approach for Lunar Science, Heliophysics, Astrobiology, Cosmology, and Exploration (2012)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Observations with radio telescopes address key problems in cosmology, astrobiology, heliophysics, and planetary science including the first light in the Universe (Cosmic Dawn), magnetic fields of extrasolar planets, particle acceleration mechanisms, and the lunar ionosphere. The Moon is a unique science platform because it allows access to radio frequencies that do not penetrate the Earth's ionosphere and because its far side is shielded from intense terrestrial emissions. The instrument packages and infrastructure needed for radio telescopes can be transported and deployed as part of Exploration activities, and the resulting science measurements may inform Exploration (e.g., measurements of lunar surface charging). An illustrative roadmap for the staged deployment of lunar radio telescopes
    Keywords: Astronomy
    Type: GLEX-2012.02.2.9x12369 , AIAA Global Space Exploration Conference; May 22, 2012; Washington, DC; United States
    Format: text
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