Compositional Measurements of Saturn's Upper Atmosphere and Rings from Cassini INMS

J. Serigano, S. M. Hörst, C. He, T. Gautier, R. V. Yelle, T. T. Koskinen, M. G. Trainer

Research output: Contribution to journalArticle

Abstract

The Cassini spacecraft's last orbits directly sampled Saturn's thermosphere and revealed a much more chemically complex environment than previously believed. Observations from the Ion and Neutral Mass Spectrometer (INMS) aboard Cassini provided compositional measurements of this region and found an influx of material raining into Saturn's upper atmosphere from the rings. We present here an in-depth analysis of the CH4, H2O, and NH3 signal from INMS and provide further evidence of external material entering Saturn's atmosphere from the rings. We use a new mass spectral deconvolution algorithm to determine the amount of each species observed in the spectrum and use these values to determine the influx and mass deposition rate for these species.

Original languageEnglish (US)
Article numbere2020JE006427
JournalJournal of Geophysical Research: Planets
Volume125
Issue number8
DOIs
StatePublished - Aug 1 2020

Keywords

  • Cassini
  • Saturn
  • atmosphere
  • mass spectrometry
  • rings

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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