Variation of Saturn's UV aurora with SKR phase

Nichols, J. D. and Cecconi, B. and Clarke, J. T. and Cowley, S. W. H. and Gérard, J.-c. and Grocott, A. and Grodent, D. and Lamy, L. and Zarka, P. (2010) Variation of Saturn's UV aurora with SKR phase. Geophysical Research Letters, 37 (15). ISSN 0094-8276

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It is well known that a wide range of kronian magnetospheric phenomena, including the Saturn kilometric radiation (SKR), exhibit oscillations near the planetary rotation period. However, although the SKR is believed to be generated by unstable auroral electrons, no connection has been established to date between diurnal SKR modulations and UV auroral power. We use an empirical SKR phase determined from Cassini observations to order the ‘quiet time’ total emitted UV auroral power as observed by the Hubble Space Telescope in programs during the interval 2005–2009. Our results indicate that both the northern and southern UV powers are dependent on SKR phase, varying diurnally by factors of ∼3. We also show that the UV variation originates principally from the morning half of the oval, consistent with previous observations of the SKR sources.

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Journal Article
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Geophysical Research Letters
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Copyright 2010 by the American Geophysical Union.
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10 Oct 2013 09:18
Last Modified:
21 Sep 2023 01:38