Infrared Aurorae in the Solar System

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Presentation transcript:

Infrared Aurorae in the Solar System ATMOSPHERIC PHYSICS LABORATORY DEPARTMENT OF PHYSICS AND ASTROMONY Infrared Aurorae in the Solar System Tom Stallard Steve Miller, Henrik Melin, Makenzie Lystrup and the Cassini community, especially: Emma Bunce, Chris Arridge, Nick Achilleos and Michele Dougherty

Hydrocarbons H3+ formation H2 + hn = H2+ + e H2 + e* = H2+ + e + e H2+ + H2 = H3+ + H H3+ destruction H3+ + X = HX+ + H2 H3+ + e- = H + H2 Hydrocarbons

Imaging: Jupiter Ultraviolet (Clarke et al) Infrared (Connerney et al)

Saturn

Uranus

Spectroscopy: Jupiter

Multiple line spectroscopy provides: emission intensities temperature composition cooling rates vertical thermal profile atmospheric densities

IR observations of Jupiter

Temperature

Cooling

Ion Winds

High resolution observations of Saturn

Compared with the UV emission

1.3” smear

Infilled Extended Flanks

Saturn Jupiter

Co-rotation breakdown Saturn Co-rotation breakdown Jupiter

Co-rotation breakdown Saturn Co-rotation breakdown Outer effects Jupiter

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