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Tiger stripes (Enceladus)
The tiger stripes of Enceladus consist of four sub-parallel, linear depressions in the south polar region of the Saturnian moon.〔 First observed on May 20, 2005 by the ''Cassini'' spacecraft's Imaging Science Sub-system (ISS) camera (though seen obliquely during an early flyby), the features are most notable in lower resolution images by their brightness contrast from the surrounding terrain.〔J. Perry, ("New Enceladus Raw Images" ). 23 May 2005. Retrieved March 22, 2006〕 Higher resolution observations were obtained by Cassini's various instruments during a close flyby of Enceladus on July 14, 2005. These observations revealed the tiger stripes to be low ridges with a central fracture.〔 Observations from the Composite Infrared Spectrometer (CIRS) instrument showed the tiger stripes to have elevated surface temperatures, indicative of present-day cryovolcanism on Enceladus centered on the tiger stripes.〔J. R. Spencer ''et al.'', ''Science'' 311, 1401 (2006).〕
== Names ==
The name tiger stripes is an unofficial term given to these four features based on their distinctive albedo. Enceladean ''sulci'' (subparallel furrows and ridges), like Samarkand Sulci and Harran Sulci, have been named after cities or countries referred to in ''The Arabian Nights''. Accordingly, in November 2006, the tiger stripes were assigned the official names Alexandria Sulcus, Cairo Sulcus, Baghdad Sulcus and Damascus Sulcus (Camphor Sulcus is a smaller feature that branches off Alexandria Sulcus). Baghdad and Damascus sulci are the most active, while Alexandria Sulcus is the least active.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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