Atmospheric thermal structures of the giant planets

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Models, Atmospheric Models, Atmospheric Temperature, Gas Giant Planets, Planetary Atmospheres, Temperature Profiles, Atmospheric Heat Budget, Infrared Spectroscopy, Radiative Heat Transfer, Temperature Effects, Vertical Distribution

Scientific paper

The thermal structures of the atmospheres of the gas giant planets as determined by two techniques are examined. The calculation of thermal models of planetary atmospheres from assumptions of the atmospheric energy budgets and the known effective planetary temperatures allows an understanding of physical processes, while the proposed retrieval of thermal profiles from infrared measurements by means of the numerical inversion of the radiative transfer equation, requires no assumptions but exhibits a limited vertical resolution. Temperature profiles calculated by the inversion method are presented and are found to lead to brightness temperature spectra which fit all the available infrared measurements fairly well for Jupiter and Saturn but only part of them for Uranus and Neptune, and do not conflict with previous thermal models. The values of the planetary effective temperatures calculated from the retrieved profiles show that Jupiter, Saturn and Neptune have strong internal heating sources while Uranus probably has a very small one or none at all.

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