Project for a world-wide network devoted to the seismology of the giant planets

Details Project for a world-wide network devoted to the seismology of the giant planets Project for a world-wide network devoted to the seismology of the giant planets

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999dps....31.5310c&link_type=abstract

American Astronomical Society, DPS meeting #31, #53.10

Astronomy and Astrophysics

Astrophysics

Scientific paper

An increasing interest has been devoted in recent years to the seismology of Jupiter and Saturn, as it is an intermediate case between the Sun and the stars. Besides the theoretical modelling, few observations have been carried out so far. An instrument, currently used in Helioseismology, has been adapted to deal with the low photon flux from the stars. It is based on the Magneto-Optical Filter (MOF), which provides two narrow (40 m Angstroms) bandpasses centered on the Sodium D-lines, 80 m Angstroms/ apart from the central wavelenght. A continuum broad-band channel is simultaneously available. The MOF stability and reference wavelenght permit to reach an high sensitivity in the power spectrum of the oscillations, despite the very low spectral-limited transmitted light. The most recent version of the instrument has characteristics of portability (60x10x10 cm x 10 Kg, PMT not included), fast mounting and low cost. Preliminary results obtained during the impact of Comet SL-9 on Jupiter in 1994 and in 3 consecutive nights in 1996 are presented [1,2]. The importance of continuous observations for an unambigous detection and identification of the oscillation frequencies requires a network of at least 1m--class telescopes all around the world. The authors thank the Ministero della Pubblica Istruzione and the Osservatorio Astronomico "V.Cerulli" di Teramo for financial support. References [1] Cacciani A., Moretti P. F., Dolci M., Brocato E., Smith E. J., 1995: Doppler Observations of the Impact of Comet P/Shoemaker-Levy/9, Fragment A, Geophys. Res. Lett., 22, 2437 [2] Cacciani A., Moretti P. F., Dolci M., D'Alessio F., Giuliani C., Micolucci E., Di Cianno A., 1999: Search for global oscillations on Jupiter with a double-cell Sodium Magneto-Optical Filter, submitted to Astron. Astrophys.

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