A tentative identification of Jovian global oscillations

Abstract

The identification of the Jovian frequency spectrum obtained by Schmider et al. (1990, 1991) is proposed, from Doppler shift observations of the solar sodium D line reflected by the planet, as a signature of Jovian global pressure modes. This spectrum, derived from 4 nights of observations, presents high-amplitude peaks whose origin is undoubtedly not noise, but it suffers from the daily interruption in the observations. Echelle diagram analysis has allowed the determination of a regular pattern, corresponding to the regularity indicatged by the asymptotic theory revised for Jovian seismology