In situ collection of dust grains falling from Saturn's rings into its atmosphere

Saturn's main rings are composed of >95% water ice, and the nature of the remaining few percent has remained unclear. The Cassini spacecraft's traversals between Saturn and its innermost D ring allowed its cosmic dust analyzer (CDA) to collect material released from the main rings and t...

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Published in:Science (American Association for the Advancement of Science) 2018-10, Vol.362 (6410)
Main Authors: Hsu, Hsiang-Wen, Schmidt, Jürgen, Kempf, Sascha, Postberg, Frank, Moragas-Klostermeyer, Georg, Seiß, Martin, Hoffmann, Holger, Burton, Marcia, Ye, ShengYi, Kurth, William S, Horányi, Mihály, Khawaja, Nozair, Spahn, Frank, Schirdewahn, Daniel, O'Donoghue, James, Moore, Luke, Cuzzi, Jeff, Jones, Geraint H, Srama, Ralf
Format: Article
Language:English
Subjects:
Atmosphere
Atmospheric entry
Atmospheric sciences
Auroras
Cassini mission
Charged particles
Composition
Cosmic dust
Deposition
Dominance
Dust
Dust control
Ejecta
Ejection
Emission analysis
Erosion
Exploration
Falling
Fluctuations
Grains
Ice
Ice formation
Latitude
Magnetic fields
Measuring instruments
Neutrons
Orbits
Radiation
Radioactive decay
Rain
Saturn
Saturn atmosphere
Scientific Concepts
Silica
Silicates
Southern Hemisphere
Spacecraft
Upper atmosphere
Water
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cited_by cdi_FETCH-LOGICAL-c366t-e813f1ef2558a5f92d3fe2934f16552f97d7de825987a67f014711b27a704d9d3
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container_issue 6410
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container_title Science (American Association for the Advancement of Science)
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creator Hsu, Hsiang-Wen
Schmidt, Jürgen
Kempf, Sascha
Postberg, Frank
Moragas-Klostermeyer, Georg
Seiß, Martin
Hoffmann, Holger
Burton, Marcia
Ye, ShengYi
Kurth, William S
Horányi, Mihály
Khawaja, Nozair
Spahn, Frank
Schirdewahn, Daniel
O'Donoghue, James
Moore, Luke
Cuzzi, Jeff
Jones, Geraint H
Srama, Ralf
description Saturn's main rings are composed of >95% water ice, and the nature of the remaining few percent has remained unclear. The Cassini spacecraft's traversals between Saturn and its innermost D ring allowed its cosmic dust analyzer (CDA) to collect material released from the main rings and to characterize the ring material infall into Saturn. We report the direct in situ detection of material from Saturn's dense rings by the CDA impact mass spectrometer. Most detected grains are a few tens of nanometers in size and dynamically associated with the previously inferred "ring rain." Silicate and water-ice grains were identified, in proportions that vary with latitude. Silicate grains constitute up to 30% of infalling grains, a higher percentage than the bulk silicate content of the rings.
doi_str_mv 10.1126/science.aat3185
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The Cassini spacecraft's traversals between Saturn and its innermost D ring allowed its cosmic dust analyzer (CDA) to collect material released from the main rings and to characterize the ring material infall into Saturn. We report the direct in situ detection of material from Saturn's dense rings by the CDA impact mass spectrometer. Most detected grains are a few tens of nanometers in size and dynamically associated with the previously inferred "ring rain." Silicate and water-ice grains were identified, in proportions that vary with latitude. 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source American Association for the Advancement of Science; JSTOR Archival Journals; Alma/SFX Local Collection
subjects Atmosphere
Atmospheric entry
Atmospheric sciences
Auroras
Cassini mission
Charged particles
Composition
Cosmic dust
Deposition
Dominance
Dust
Dust control
Ejecta
Ejection
Emission analysis
Erosion
Exploration
Falling
Fluctuations
Grains
Ice
Ice formation
Latitude
Magnetic fields
Measuring instruments
Neutrons
Orbits
Radiation
Radioactive decay
Rain
Saturn
Saturn atmosphere
Scientific Concepts
Silica
Silicates
Southern Hemisphere
Spacecraft
Upper atmosphere
Water
title In situ collection of dust grains falling from Saturn's rings into its atmosphere
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