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Ulyana A. Dyudina, Danika F. Wellington, Shawn P. Ewald, Andrew P. Ingersoll .

Saturn's North and South aurora observed by Cassini camera in visible wavelengths . + UVIS simultaneous observations. Ulyana A. Dyudina, Danika F. Wellington, Shawn P. Ewald, Andrew P. Ingersoll . + Wayne Prior et al. Aurora Australis. Spectrum. Rayleigh/nm. Measured by Cassini

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Ulyana A. Dyudina, Danika F. Wellington, Shawn P. Ewald, Andrew P. Ingersoll .

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  1. Saturn's North and South aurora observed by Cassini camera in visible wavelengths. • + UVIS simultaneous observations Ulyana A. Dyudina, Danika F. Wellington, Shawn P. Ewald, Andrew P. Ingersoll. + Wayne Prior et al.

  2. Aurora Australis

  3. Spectrum Rayleigh/nm Measured by Cassini Lab simulation • (Aguilar et al. ApJ. 177, 2008)

  4. Saturn periodicities Saturn day 0 Day 2 Day 5 Day 7

  5. Saturn periodicities Voyager SKR period: 10.6564±0.002 h Our Aurora period = Voyager’s= = 10.65±0.06 h Saturn day 0 Day 2 Day 5 Day 7

  6. SKR rotation period 10.65±0.06 h • Gurtett, et al. GRL 37, L24101, 2010

  7. Nov. 2010 aurora

  8. Nov. 2010 aurora

  9. Nov. 2010 aurora

  10. Nov. 2010 aurora

  11. Nov. 2010 aurora

  12. ... • + UVIS simultaneous observations … + Wayne Prior et al.

  13. Rev 119 UVIS data (2009 day 280) painted on Saturn:

  14. UVIS 2009 day 280 data for ISS snakes 281T00:07 ISS “snakes” 280T23:00 UVIS FUV 60 mrad long low-res (1.5 mrad wide) slit is aligned E-W, spatial sectors 27-32 (out of 0-59) overlap ISS NAC and the “Snake” features As time progresses (upwards in UVIS image) bursty quasi-periodic features rotate across Saturn’s nightside

  15. Night Side UVIS counts time-series: bright bursts are deep, show up more at long wavelengths (short wavelengths are absorbed by methane)

  16. Figure from Gustin et al. 2008 • Large methane columns above snakes, other nightside spots imply electron penetration hundreds of km below usual ~1100 km auroras found by Gerard et al. 2009 • Visually, “curtains” at limb are higher than “snakes” • Tests methane distribution models ✚ snake

  17. Conclusions Aurora is ~1200 km tall Aurora is few hundred km above Saturn’s “surface”, bright events are deeper Aurora may form double curtain Aurora is red Auroral rotation matches SKR rotation period I would love your suggestions on planning auroral observations with ISS

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