First Thermal IR Images of Neptune: Evidence forSouthern Polar Heating and Methane Escape - Observatoire de Paris
Article Dans Une Revue The Messenger Année : 2007

First Thermal IR Images of Neptune: Evidence forSouthern Polar Heating and Methane Escape

Glenn S. Orton
  • Fonction : Auteur
Cédric Leyrat
  • Fonction : Auteur
Richard C. Puetter
  • Fonction : Auteur
Andrew J. Friedson
  • Fonction : Auteur
Eric Pantin
  • Fonction : Auteur

Résumé

Images of Neptune have been obtained in the thermal range, in filters between 8 and 19 μm, using the VISIR mid-infrared imaging spectrometer at the VLT-UT3 (Melipal). They allow, for the first time, mapping of atmospheric temperatures at different altitude levels, rang-ing from the tropopause to the stratosphere. It was found that the south pole of Neptune, at the level of the tropopause, appears to be warmer than the rest of the planet by 6 to 8 K. This south-ern polar warming can be explained by its constant solar illumination over the past 40 years, as the southern summer solstice occurred in July 2005. The other unexpected discovery is the evidence for a stratospheric hot spot located at 65-70°S which rotates with the planet at the atmospheric rotation rate of about 12 hours.
Fichier non déposé

Dates et versions

obspm-03855241 , version 1 (16-11-2022)

Identifiants

Citer

Thérèse Encrenaz, Glenn S. Orton, Cédric Leyrat, Richard C. Puetter, Andrew J. Friedson, et al.. First Thermal IR Images of Neptune: Evidence forSouthern Polar Heating and Methane Escape. The Messenger, 2007, 130, pp.23-31. ⟨obspm-03855241⟩
9 Consultations
0 Téléchargements

Partager

More