Infrared Aurorae in the Solar System

INFRARED AURORAE IN THE SOLAR SYSTEM

Infrared Aurorae in the Solar System

Tom Stallard

ATMOSPHERIC PHYSICS LABORATORYDEPARTMENT OF PHYSICS AND ASTROMONY

Steve Miller, Henrik Melin, Makenzie Lystrup

and the Cassini community, especially: Emma Bunce, Chris

Arridge, Nick Achilleos and Michele Dougherty

INFRARED AURORAE IN THE SOLAR SYSTEM

H3+ formation

  H2 + h = H2+ + e

H2 + e* = H2+ + e + e

H2+ + H2 = H3

+ + H

H3+ destruction

H3+ + X = HX+ + H2

H3+ + e- = H + H2

Hydrocarbons Hydrocarbons

INFRARED AURORAE IN THE SOLAR SYSTEM

Infrared

(Connerney et al)

Ultraviolet

(Clarke et al)

Imaging: Jupiter

INFRARED AURORAE IN THE SOLAR SYSTEM

Saturn

INFRARED AURORAE IN THE SOLAR SYSTEM

Uranus

INFRARED AURORAE IN THE SOLAR SYSTEM

Spectroscopy: Jupiter

INFRARED AURORAE IN THE SOLAR SYSTEM

Multiple line spectroscopy provides:

• emission intensities• temperature• composition• cooling rates• vertical thermal profile• atmospheric densities

INFRARED AURORAE IN THE SOLAR SYSTEM

IR observations of Jupiter

INFRARED AURORAE IN THE SOLAR SYSTEM

Temperature

INFRARED AURORAE IN THE SOLAR SYSTEM

Cooling

INFRARED AURORAE IN THE SOLAR SYSTEM

Ion Winds

INFRARED AURORAE IN THE SOLAR SYSTEM

INFRARED AURORAE IN THE SOLAR SYSTEM

INFRARED AURORAE IN THE SOLAR SYSTEM

High resolution observations of

Saturn

INFRARED AURORAE IN THE SOLAR SYSTEM

INFRARED AURORAE IN THE SOLAR SYSTEM

Compared with the UV emission

INFRARED AURORAE IN THE SOLAR SYSTEM

1.3” smear

INFRARED AURORAE IN THE SOLAR SYSTEM

Infilled

Extended Flanks

INFRARED AURORAE IN THE SOLAR SYSTEM

INFRARED AURORAE IN THE SOLAR SYSTEM

Saturn

Jupiter

INFRARED AURORAE IN THE SOLAR SYSTEM

Saturn

Jupiter

Co-rotation breakdown

INFRARED AURORAE IN THE SOLAR SYSTEM

Saturn

Jupiter

Co-rotation breakdown Outer effects