EnVision: taking the pulse of our twin planet

Richard C. Ghail*, Colin Wilson, Marina Galand, David Hall, Chris Cochrane, Philippa Mason, Joern Helbert, Franck MontMessin, Sanjay Limaye, Manish Patel, Neil Bowles, Daphne Stam, Jan-Erik Wahlund, Fabio Rocca, David Waltham, Tamsin A. Mather, Juliet Biggs, Matthew Genge, Philippe Paillou, Karl MitchellLionel Wilson, Upendra N. Singh

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

10 Citations (Scopus)

Abstract

EnVision is an ambitious but low-risk response to ESA's call for a medium-size mission opportunity for a launch in 2022. Venus is the planet most similar to Earth in mass, bulk properties and orbital distance, but has evolved to become extremely hostile to life. EnVision's 5-year mission objectives are to determine the nature of and rate of change caused by geological and atmospheric processes, to distinguish between competing theories about its evolution and to help predict the habitability of extrasolar planets. Three instrument suites will address specific surface, atmosphere and ionosphere science goals. The Surface Science Suite consists of a 2.2 m(2) radar antenna with Interferometer, Radiometer and Altimeter operating modes, supported by a complementary IR surface emissivity mapper and an advanced accelerometer for orbit control and gravity mapping. This suite will determine topographic changes caused by volcanic, tectonic and atmospheric processes at rates as low as 1 mm a (-aEuro parts per thousand 1). The Atmosphere Science Suite consists of a Doppler LIDAR for cloud top altitude, wind speed and mesospheric structure mapping, complemented by IR and UV spectrometers and a spectrophotopolarimeter, all designed to map the dynamic features and compositions of the clouds and middle atmosphere to identify the effects of volcanic and solar processes. The Ionosphere Science Suite uses a double Langmiur probe and vector magnetometer to understand the behaviour and long-term evolution of the ionosphere and induced magnetosphere. The suite also includes an interplanetary particle analyser to determine the delivery rate of water and other components to the atmosphere.

Translated title of the contributionEnVision: taking the pulse of our twin planet
Original languageEnglish
Pages (from-to)337-363
Number of pages27
JournalExperimental Astronomy
Volume33
Issue number2-3
DOIs
Publication statusPublished - Apr 2012

Keywords

  • Venus tectonics
  • Venus atmosphere
  • Venus ionosphere
  • InSAR
  • LIDAR
  • RADAR INTERFEROMETRY
  • YELLOWSTONE CALDERA
  • THETIS-REGIO
  • VENUS
  • VOLCANISM
  • SUBDUCTION
  • TECTONICS
  • EVOLUTION
  • BOUNDARY
  • DYNAMICS

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