Atomic Hydrogen on Mars: Measurements at Solar Minimum

@article{Levine1978AtomicHO,
  title={Atomic Hydrogen on Mars: Measurements at Solar Minimum},
  author={Joel S. Levine and David S. Mcdougal and D. E. Anderson and Edwin S. Barker},
  journal={Science},
  year={1978},
  volume={200},
  pages={1048 - 1051}
}
The Copernicus Orbiting Astronomical Observatory was used to obtain measurements of Mars Lyman-α (1215.671-angstrom) emission at the solar minimum, which has resulted in the first information on atomic hydrogen concentrations in the upper atmosphere of Mars at the solar minimum. The Copernicus measurements, coupled with the Viking in situ measurements of the temperature (170� � 30�K) of the upper atmosphere of Mars, indicate that the atomic hydrogen number density at the exobase of Mars (250… 
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