Chemical interactions between Saturn's atmosphere and its rings
| Autor: | A. M. Persoon, Michiko Morooka, B. D. Teolis, James D. Walker, J. N. Cuzzi, William S. Kurth, Stephen A. Ledvina, Matthew M. Hedman, J. H. Waite, Luke Moore, Roger V. Yelle, T. Brockwell, J. Grimes, Lina Hadid, Jared Bell, Kelly E. Miller, A. F. Nagy, Christopher R. Glein, Thomas E. Cravens, W-H. Ip, Donald G. Mitchell, Robert E. Johnson, Jan-Erik Wahlund, Sidney Chocron, Rebecca Perryman, Mark E. Perry, Orenthal J. Tucker, Wei-Ling Tseng |
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| Rok vydání: | 2018 |
| Předmět: |
Multidisciplinary
010504 meteorology & atmospheric sciences Equator chemistry.chemical_element Scale height 01 natural sciences Nitrogen Methane Astrobiology chemistry.chemical_compound chemistry Atmospheric chemistry 0103 physical sciences Carbon dioxide Ionosphere 010303 astronomy & astrophysics 0105 earth and related environmental sciences Carbon monoxide |
| Zdroj: | Science (New York, N.Y.). 362(6410) |
| ISSN: | 1095-9203 |
| Popis: | Cassini's final phase of exploration The Cassini spacecraft spent 13 years orbiting Saturn; as it ran low on fuel, the trajectory was changed to sample regions it had not yet visited. A series of orbits close to the rings was followed by a Grand Finale orbit, which took the spacecraft through the gap between Saturn and its rings before the spacecraft was destroyed when it entered the planet's upper atmosphere. Six papers in this issue report results from these final phases of the Cassini mission. Dougherty et al. measured the magnetic field close to Saturn, which implies a complex multilayer dynamo process inside the planet. Roussos et al. detected an additional radiation belt trapped within the rings, sustained by the radioactive decay of free neutrons. Lamy et al. present plasma measurements taken as Cassini flew through regions emitting kilometric radiation, connected to the planet's aurorae. Hsu et al. determined the composition of large, solid dust particles falling from the rings into the planet, whereas Mitchell et al. investigated the smaller dust nanograins and show how they interact with the planet's upper atmosphere. Finally, Waite et al. identified molecules in the infalling material and directly measured the composition of Saturn's atmosphere. Science , this issue p. eaat5434 , p. eaat1962 , p. eaat2027 , p. eaat3185 , p. eaat2236 , p. eaat2382 |
| Databáze: | OpenAIRE |
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