Search for global oscillations on Jupiter with a double-cell sodium magneto-optical filter

Free access article

Issue		A&A Volume 372, Number 1, June II 2001


Page(s)		317 - 325
Section		The solar system
DOI		http://dx.doi.org/10.1051/0004-6361:20010455

A&A 372, 317-325 (2001)
DOI: 10.1051/0004-6361:20010455

Search for global oscillations on Jupiter with a double-cell sodium magneto-optical filter

A. Cacciani¹, M. Dolci^{1, 2}, P. F. Moretti^{1, 3}, F. D'Alessio⁴, C. Giuliani², E. Micolucci² and A. Di Cianno²

¹ Università degli Studi di Roma "La Sapienza", P.le A. Moro 5, 00185 Rome, Italy
² Osservatorio Astronomico "V. Cerulli" di Teramo, Via M. Maggini, 64100 Teramo, Italy
³ Osservatorio Astronomico di Capodimonte, Via Moiariello 16, 80131 Napoli, Italy
⁴ Osservatorio Astronomico di Roma, Via Frascati 33, 00040, Monte Porzio Catone, Italy

(Received 30 January 2001 / Accepted 22 March 2001 )

Abstract
Doppler observations on Jupiter are presented and discussed. A two-cells Magneto-Optical Filter (MOF), able to obtain two separate signals, Red and Blue, on the opposite wings of the Sodium D-lines, along with a continuum reference signal, has been used. This set of data permits to discriminate between real oscillations and albedo "modes" by means of the two algorithms ${\cal D}=(B-R)/(B+R)$ and ${\cal S}=(B+R)$ /conti nuum. No unambiguous oscillation modes were detected with amplitudes above the 1- $\sigma$ level of ~1.2 m s^-1 in the range between 0.5 and 0.7 mHz. However, using refined analysis for signal recovery in a noisy background we notice an increase of power also in the region of the solar 5 min oscillations. The albedo variations on the Jupiter's surface and instrumental effects are addressed to be responsible for the spurious signals.

Key words: planets and satellites: general

Offprint request: M. Dolci, dolci@astrte.te.astro.it

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