Zonal CCD-spectrophotometry of Saturn and Relations between the Methane Absorption Bands Parameters

Details Zonal CCD-spectrophotometry of Saturn and Relations between the Methane Absorption Bands Parameters Zonal CCD-spectrophotometry of Saturn and Relations between the Methane Absorption Bands Parameters

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.3704t&link_type=abstract

American Astronomical Society, DPS meeting #39, #37.04; Bulletin of the American Astronomical Society, Vol. 39, p.487

Astronomy and Astrophysics

Astronomy

Scientific paper

During last years spectrophotometric observations of Saturn were carried out regularly. Besides usual CCD-spectra recorded at the spectrograph slit oriented along the central meridian the scanning technique was used also to decrease the ratio S/N (signal to noise) without increase of the exposition time .. The image of Saturn moved very slowly from S-pole to N-pole across the slit parallel to equator. Thus more thousand consequent spectra of different zones of Saturn's disk were recorded and processed (200-250 during each scan series). On the middle of each spectrum the 20 pixel width band was sliced , digitized and summarized perpendicularly to the dispersion direction. Latitudinal variations of the central depths and equivalent widths for the methane absorption bands have been derived from the measurements of a number of that scan series. The latitudinal changes of these values for weak (centered at 619, 686, 702 nm) and moderate (725 nm) absorption bands are not similar. Intensity of weak bands formed at greater effective depths in the clouds decreases in Southern hemisphere towards S-pole but the 725 nm band don't show that decrease. The correlation between the characteristics of the absorption bands is not linear and has the looplike view. The ratio between the 725 and 619 nm for both equivalent widths and central depths is significantly different at S and N latitudes. On high Southern latitudes the graph this ratio has a like view. These peculiarities are analyzed now and must be considered in terms of inhomogeneous cloud structure. The deeper clouds may be more dense at high Southern latitudes.. New observations in 2007 have confirmed also the trend of the methane absorption increase in Southern temperate latitudes which occurred during 1995-2006.

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