کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5487217 | 1523492 | 2018 | 16 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Cloud morphology and dynamics in Saturn's northern polar region
ترجمه فارسی عنوان
مورفولوژی و پویایی ابر در ناحیه قطبی شمال زحل
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم فضا و نجوم
چکیده انگلیسی
We present a study of the cloud morphology and motions in the north polar region of Saturn, from latitude â¼ 70°N to the pole based on Cassini ISS images obtained between January 2009 and November 2014. This region shows a variety of dynamical structures: the permanent hexagon wave and its intense eastward jet, a large field of permanent “puffy” clouds with scales from 10 - 500â¯km, probably of convective origin, local cyclone and anticyclones vortices with sizes of â¼1,000â¯km embedded in this field, and finally the intense cyclonic polar vortex. We report changes in the albedo of the clouds that delineate rings of circulation around the polar vortex and the presence of “plume-like” activity in the hexagon jet, in both cases not accompanied with significant variations in the corresponding jets. No meridional migration is observed in the clouds forming and merging in the field of puffy clouds, suggesting that their mergers do not contribute to the maintenance of the polar vortex. Finally, we analyze the dominant growing modes for barotropic and baroclinic instabilities in the hexagon jet, showing that a mode 6 barotropic instability is dominant at the latitude of the hexagon.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Icarus - Volume 299, 1 January 2018, Pages 117-132
Journal: Icarus - Volume 299, 1 January 2018, Pages 117-132
نویسندگان
Arrate Antuñano, Teresa del RÃo-Gaztelurrutia, AgustÃn Sánchez-Lavega, Javier RodrÃguez-Aseguinolaza,