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

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

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...372..317c&link_type=abstract

Astronomy and Astrophysics, v.372, p.317-325 (2001)

Astronomy and Astrophysics

Astrophysics

3

Planets And Satellites: General

Scientific paper

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 D=(B-R)/(B+R) and S=(B+R)/continuum. 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.

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