Variation of Saturn's UV aurora with SKR phase

Details Variation of Saturn's UV aurora with SKR phase Variation of Saturn's UV aurora with SKR phase

Aug 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3715102n&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 15, CiteID L15102

Physics

11

Planetary Sciences: Fluid Planets: Aurorae, Planetary Sciences: Fluid Planets: Magnetospheres (2756), Magnetospheric Physics: Planetary Magnetospheres (5443, 5737, 6033), Magnetospheric Physics: Auroral Phenomena (2407), Planetary Sciences: Solar System Objects: Saturn

Scientific paper

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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