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Publication Detail
Simultaneous Cassini VIMS and UVIS observations of Saturn's southern aurora: Comparing emissions from H, H-2 and H-3(+) at a high spatial resolution
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Melin H, Stallard T, Miller S, Gustin J, Galand M, Badman SV, Pryor WR, O'Donoghue J, Brown RH, Baines KH
  • Publisher:
    AMER GEOPHYSICAL UNION
  • Publication date:
    10/08/2011
  • Journal:
    GEOPHYS RES LETT
  • Volume:
    38
  • Print ISSN:
    0094-8276
  • Language:
    EN
  • Keywords:
    ATMOSPHERE, ELECTRONS, LOCATION, MOLECULE, JUPITER, IONS
  • Addresses:
    Melin, H
    Univ Leicester
    Dept Phys & Astron
    Leicester
    LE1 7RH
    Leics
    England

    Cent Arizona Coll
    Coolidge
    AZ
    85228
    USA
Abstract
Here, for the first time, temporally coincident and spatially overlapping Cassini VIMS and UVIS observations of Saturn's southern aurora are presented. Ultraviolet auroral H and H-2 emissions from UVIS are compared to infrared H-3(+) emission from VIMS. The auroral emission is structured into three arcs - H, H-2 and H-3(+) are morphologically identical in the bright main auroral oval (similar to 73 degrees S), but there is an equatorward arc that is seen predominantly in H (similar to 70 degrees S), and a poleward arc (similar to 74 degrees S) that is seen mainly in H-2 and H-3(+). These observations indicate that, for the main auroral oval, UV emission is a good proxy for the infrared H-3(+) morphology (and vice versa), but for emission either poleward or equatorward this is no longer true. Hence, simultaneous UV/IR observations are crucial for completing the picture of how the atmosphere interacts with the magnetosphere. Citation: Melin, H., T. Stallard, S. Miller, J. Gustin, M. Galand, S. V. Badman, W. R. Pryor, J. O'Donoghue, R. H. Brown, and K. H. Baines (2011), Simultaneous Cassini VIMS and UVIS observations of Saturn's southern aurora: Comparing emissions from H, H2 and H-3(+) at a high spatial resolution, Geophys. Res. Lett., 38, L15203, doi:10.1029/2011GL048457.
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