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    Plasma Transport in Saturn's Low‐Latitude Ionosphere: Cassini Data

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    Cravens_2019.pdf (1.774Mb)
    Issue Date
    2019-05-20
    Author
    Cravens, T. E.
    Morooka, M.
    Renzaglia, A.
    Moore, L.
    Waite, J. H., Jr.
    Perryman, R.
    Perry, M.
    Wahlund, J.‐E.
    Persoon, A.
    Hadid, L.
    Publisher
    Wiley
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
    Rights
    ©2019. American Geophysical Union. All Rights Reserved.
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    Abstract
    In 2017 the Cassini Orbiter made the first in situ measurements of the upper atmosphere and ionosphere of Saturn. The Ion and Neutral Mass Spectrometer in its ion mode measured densities of light ion species (H+, H2+, H3+, and He+), and the Radio and Plasma Wave Science instrument measured electron densities. During proximal orbit 287 (denoted P287), Cassini reached down to an altitude of about 3,000 km above the 1 bar atmospheric pressure level. The topside ionosphere plasma densities measured for P287 were consistent with ionospheric measurements during other proximal orbits. Spacecraft potentials were measured by the Radio and Plasma Wave Science Langmuir probe and are typically about negative 0.3 V. Also, for this one orbit, Ion and Neutral Mass Spectrometer was operated in an instrument mode allowing the energies of incident H+ ions to be measured. H+ is the major ion species in the topside ionosphere. Ion flow speeds relative to Saturn's atmosphere were determined. In the southern hemisphere, including near closest approach, the measured ion speeds were close to zero relative to Saturn's corotating atmosphere, but for northern latitudes, southward ion flow of about 3 km/s was observed. One possible interpretation is that the ring shadowing of the southern hemisphere sets up an interhemispheric plasma pressure gradient driving this flow.
    Description
    An edited version of this paper was published by AGU. Copyright 2019 American Geophysical Union.
    URI
    http://hdl.handle.net/1808/31450
    DOI
    https://doi.org/10.1029/2018JA026344
    Collections
    • Physics and Astronomy Scholarly Works [1632]
    Citation
    Cravens, T. E., Morooka, M., Renzaglia, A., Moore, L., Waite, J. H., Perryman, R., et al. (2019). Plasma transport in Saturn's low‐latitude ionosphere: Cassini data. Journal of Geophysical Research: Space Physics, 124, 4881– 4888. https://doi.org/10.1029/2018JA026344

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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