The structure of Venus’ middle atmosphere and ionosphere

@article{Ptzold2007TheSO,
  title={The structure of Venus’ middle atmosphere and ionosphere},
  author={Martin P{\"a}tzold and Bernd H{\"a}usler and Michael K Bird and Silvia Tellmann and R. Mattei and Sami W. Asmar and V{\'e}ronique Dehant and Werner Eidel and Takeshi Imamura and Richard A. Simpson and G. Len Tyler},
  journal={Nature},
  year={2007},
  volume={450},
  pages={657-660}
}
The atmosphere and ionosphere of Venus have been studied in the past by spacecraft with remote sensing or in situ techniques. These early missions, however, have left us with questions about, for example, the atmospheric structure in the transition region from the upper troposphere to the lower mesosphere (50–90 km) and the remarkably variable structure of the ionosphere. Observations become increasingly difficult within and below the global cloud deck (<50 km altitude), where strong absorption… 

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