Jupiter's South Tropical Dark Area

Details Jupiter's South Tropical Dark Area Jupiter's South Tropical Dark Area

Oct 1909

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1909natur..81..487b&link_type=abstract

Nature, Volume 81, Issue 2086, pp. 487 (1909).

Physics

Scientific paper

ALL the transit estimates, numbering fifty-two, of the south tropical dark area on Jupiter, obtained during the apparition of 1908-9, have been reduced to longitude. The area in 1908 December was found to be more than 50° in length at the south equatorial belt. From this date to the close of the observations in 1909 June its dimensions exhibited a gradual increase, and in the latter month it covered considerably more than 90° of longitude. This longitudinal growth was due chiefly to a marked difference in the observed rate of velocity of the two ends of the area. While the preceding end drifted at a pretty normal rate of 15° per month in excess of the adopted zero meridian of System II., the following end exhibited a monthly drift of only 9°. The following part of the area, therefore, was not keeping pace with the preceding portion, and accordingly the object itself became distended in longitude.

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