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The moon

, Volume 14, Issue 1, pp 19–25 | Cite as

Bow shock protons in the lunar environment

  • J. Benson
  • J. W. Freeman
  • H. K. Hills
  • R. R. Vondrak
Article

Abstract

Protons from the Earth's bow shock are observed by the Suprathermal Ion detector Experiment (SIDE) in two regions of the lunar orbit. The dawn region begins at the dawn side bow shock crossing and ends ç 5 days later and the dusk region begins at ç 2 days prior to entering the dusk side magnetosheath and ends at the inbound bow shock crossing. Dusk and dawn refer to a terrestrial coordinate system. The dominant contribution to the ion spectra observed by the SIDE in these regions is from particles with energies between ç 750 eV q−1 and 3500 eV q−1. 3500 eVq−1 is the upper limit of the energy range of the detector. Analysis of simultaneous data from the Explorer 35 magnetometer and the SIDE indicates that the observability of bow shock protons at the lunar distance is dependent on the configuration of the interplanetary magnetic field.

Keywords

Magnetic Field Coordinate System Energy Range Interplanetary Magnetic Field Dominant Contribution 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Asbridge, J. R., Bame, S. J., and Strong, I. B.: 1968,J. Geophys. Res. 73, 5777.Google Scholar
  2. Benson, J.: 1974, ‘Observation of Bow Shock Protons at the Lunar Orbit’, M. S. Thesis, Rice University, Houston, Texas, U.S.A.Google Scholar
  3. Freeman, J. W., Jr., Balsiger, H., and Hills, H. K.: 1970,Apollo 12 Preliminary Science Report, NASA SP-235, 83.Google Scholar
  4. Hills, H. K., Freeman, J. W., Jr., and Balsiger, H.: 1970,Trans. Am. Geophys. Union 51, 407.Google Scholar
  5. Lin, R. P., Meng, C. I., and Anderson, K. A.: 1974,J. Geophys. Res. 79, 489.Google Scholar

Copyright information

© D. Reidel Publishing Company 1975

Authors and Affiliations

  • J. Benson
    • 1
  • J. W. Freeman
    • 1
  • H. K. Hills
    • 1
  • R. R. Vondrak
    • 2
  1. 1.Dept. of Space Physics and AstronomyRice UniversityHoustonUSA
  2. 2.Radio Physics LaboratoryStanford Research InstituteMenlo ParkUSA

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