Bibcode
Mosser, B.; Delache, Ph.; Schmider, F. X.; Gautier, D.
Referencia bibliográfica
Astronomy and Astrophysics (ISSN 0004-6361), vol. 251, no. 1, Nov. 1991, p. 356-364. Research supported by INSU and CNRS.
Fecha de publicación:
11
1991
Número de citas
33
Número de citas referidas
31
Descripción
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. The spectrum, derived from 4 nights of
observations, presents high-amplitude peaks whose origin in 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 indicated by the
asymptotic theory (Tassoul 1980) revised for Jovian seismology (Provost
et al., in preparation). The observed equidistance is not a direct
measurement of the characteristic frequency, but is closely related to
it. As expected two frequencies dominate the spectrum: the rotational
frequencies of the earth and of Jupiter. However, it has been possible
to construct an echelle diagram based on a frequency which satisfies
three criteria. The physical implications of the low value of the
characteristic frequency and of the large amplitudes of detected
oscillations are discussed.