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Dawn-dusk oscillation of Saturn's conjugate auroral ovals

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posted on 2021-09-24, 11:22 authored by JD Nichols, SWH Cowley, L Lamy
[1] We present observations of the oscillation of the dawn-dusk locations of Saturn's northern and southern UV auroral ovals obtained using the Hubble Space Telescope during the 2009 equinoctial campaign. We determine the dawn-dusk locations of the centers of the southern and northern auroral ovals from the mean of the dawnward and duskward extents of the emission, and order the computed locations by the phases of the respective SKR oscillations for each hemisphere. We show that statistically significant ∼1–2° oscillations of the dawn-dusk location of the auroral ovals are evident, with the duskward displacement being in lagging quadrature with the SKR power. These results, the first to indicate that the location of the northern auroral oval oscillates, show that the cause of the oscillation is an external magnetospheric current system, and the sense of the oscillations is consistent with the expected displacement caused by magnetic perturbations observed throughout Saturn's magnetosphere.

History

Citation

GEOPHYSICAL RESEARCH LETTERS, 2010, 37(24). https://doi.org/10.1029/2010GL045818

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

  • VoR (Version of Record)

Published in

Geophysical Research Letters

Volume

37

Issue

24

Publisher

Wiley for American Geophysical Union (AGU)

issn

0094-8276

Acceptance date

2010-11-15

Copyright date

2010

Available date

2021-09-24

Language

English

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