The Hemispheric Differences in the Methane and Ammonia Absorptions on Saturn near last Equinox in 2008-2010.

Details The Hemispheric Differences in the Methane and Ammonia Absorptions on Saturn near last Equinox in 2008-2010. The Hemispheric Differences in the Methane and Ammonia Absorptions on Saturn near last Equinox in 2008-2010.

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.1120t&link_type=abstract

American Astronomical Society, DPS meeting #42, #11.20; Bulletin of the American Astronomical Society, Vol. 42, p.1021

Astronomy and Astrophysics

Astronomy

Scientific paper

Rare situation connected with Saturn's equinox had given an opportunity to compare the state of the atmosphere in both hemispheres of this planet at near the same visibility conditions. during 2008-2010. Our research had been directed to the study of the methane and ammonia absorption bands behavior on different latitudes and comparison of their intensity at Southern and Northern hemispheres. This period is transitional between primary insolation of S-hemisphere in preceding years and the growth of insolation of N-hemisphere during next seven years. We continue the spectrophotometric scanning of Saturn's disk as described earlier (41-st DPS Annual Meeting-Abstract 14.05) and processed about 3000 zonal CCD-spectrograms .We should like here to turn attention on the space-time changes in the ratio of equivalent widths of the CH4 bands centered at 619 nm and 725 nm between 2008 and 2010 observational seasons. This ratio Kw=W619/W725 . is not latitudinally constant and shows increase from S-latitudes to N-latitudes. In February 2008 at S-temperate latitudes minimum value Kws =0.20-0.21, but at N-temperate latitudes maximum Kwn=0.29-0.30. During next Saturn's apparitions this ratio increases in S-hemisphere and decreases in N-hemisphere. In 2008-2009 Kws=0.215 and Kwn=0.265. In 2010 an amplitude of S-N differences noticeably decreased: Kws =0.225 but Kwn=0.250. In the beginning of 2008 the temperate latitudes showed extreme Kw values but in the next seasons the latitudinal variations of Kw within one hemisphere were smoothed. A comparison of NH3643+CH4670 band profiles in S- and N- temperate belts detected also the growth of the ammonia absorption in Northern hemisphere. These hemispheric differences may be considered preliminary as an evidence of the decreased cloud volume density in N-hemisphere

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