Saturn's northern auroras as observed by the Hubble Space Telescope

Details Saturn's northern auroras as observed by the Hubble Space Telescope Saturn's northern auroras as observed by the Hubble Space Telescope

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1485n&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1485

Computer Science

Scientific paper

Auroral emissions are a vital tool in diagnosing the dynamics of planetary magnetospheres. While Saturn's southern UV auroras have been observed with highsensitivity cameras onboard the Hubble Space Telescope (HST), the observatory has only ever observed the northern auroras at very oblique angles. However, Saturn has now passed equinox and is moving toward summer in the northern hemisphere, such that the northern auroras are now visible from Earth, and previous results from HST have indicated that Saturn's northern auroras are not simply mirror images of the southern. We use HST images of Saturn obtained during April 2011 to show that the northern auroras exhibit a variety of morphologies, which seem broadly similar to those previously observed in the south. During the observing interval an interplanetary compression region impinged on the magnetosphere, and the response of the northern auroras is qualitatively similar to the south, i.e the initially dim oval emission brightens and both poleward and equatorward boundaries move toward the pole. In this presentation we review the evolution of the auroral morphology in conjunction with in situ Cassini and ground-based data.

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