Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...251l..15p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 251, no. 2, Nov. 1991, p. L15-L18. Research supported by INSU.
Astronomy and Astrophysics
Astrophysics
17
Auroras, Infrared Radiation, Jupiter Atmosphere, Particle Precipitation, Planetary Magnetospheres, Ultraviolet Radiation, Abundance, Brightness Distribution, Ethane, Methane, Satellite Observation, Voyager Project
Scientific paper
The morphological features of the mid-IR (hydrocarbons) north auroral 'hot spot' are compared with those of the UV aurora as derived from the Voyager observations, and with various possible loci of particle precipitations. This suggests that all three processes must occur in the same region, delimited by the 'UVS auroral oval'. The longitudinal profile of the IR emission is then shown to be similar to model profiles of the electron flux precipitated in a diffuse aurora, and the best fit model parameters are those which also fit the UVS brightness distribution. It is concluded that either the precipitations are the cause (direct or indirect) of both the UV and mid-IR aurorae, or all three phenomena derive from a common initial process in the middle magnetosphere.
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