ulyana a. dyudina, danika f. wellington, shawn p. ewald, andrew p. ingersoll
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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Saturn's North and South aurora observed by Cassini camera in visible wavelengths.
+ UVIS simultaneous observationsUlyana A. Dyudina, Danika F. Wellington, Shawn P. Ewald,
Andrew P. Ingersoll.+ Wayne Prior et al.
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Aurora Australis
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SpectrumMeasuredby Cassini
Lab simulation
(Aguilar et al. ApJ. 177, 2008)
Rayleigh/nm
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Saturn periodicities
Saturn day 0
Day 2
Day 5
Day 7
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Saturn periodicities
Saturn day 0
Day 2
Day 5
Day 7
Voyager SKR period: 10.6564±0.002 h
Our Aurora period = Voyager’s= = 10.65±0.06 h
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SKR rotation period
Gurtett, et al. GRL 37, L24101, 2010
10.65±0.06 h
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Nov. 2010 aurora
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Nov. 2010 aurora
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Nov. 2010 aurora
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Nov. 2010 aurora
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Nov. 2010 aurora
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...+ UVIS simultaneous observations
…+ Wayne Prior et al.
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Rev 119 UVIS data (2009 day 280) painted on Saturn:
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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
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Night Side UVIS counts time-series: bright bursts are deep, show up more at long wavelengths (short wavelengths are absorbed by methane)
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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
✚
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ConclusionsAurora 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