IUE observations of Neptune for H Lyman-alpha emission

Details IUE observations of Neptune for H Lyman-alpha emission IUE observations of Neptune for H Lyman-alpha emission

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15..701c&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 15, July 1988, p. 701-704.

Astronomy and Astrophysics

Astronomy

6

H Alpha Line, Lyman Alpha Radiation, Neptune Atmosphere, Ultraviolet Astronomy, Atmospheric Heating, Brightness Distribution, Incident Radiation, Iue

Scientific paper

Study of seven IUE observations has not resulted in the detection of H Ly-alpha emission from Neptune, with 1-sigma upper limits to the planet-averaged surface brightness as low as 180 Rayleighs. The intrinsic brightness is found to be less than the 400-1500 R that would be expected from scaling arguments, and it is noted that this upper limit excludes neither the possibility of scattered solar H Ly-alpha emission from a Jupiter-like atmosphere, nor auroral emission from an active magnetosphere. The results suggest that Neptune has a lower upper atmospheric temperature than Uranus.

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