翻訳と辞書 Words near each other ・ Differential norming ・ Differential object marking ・ Differential of a function ・ Differential of the first kind ・ Differential operator ・ Differential optical absorption spectroscopy ・ Differential outcomes effect ・ Differential phase ・ Differential poset ・ Differential privacy ・ Differential psychology ・ Differential pulley ・ Differential pulse voltammetry ・ Differential pulse-code modulation ・ Differential refractometer ・ Differential rotation ・ Differential scanning calorimetry ・ Differential screw ・ Differential signaling ・ Differential space–time code ・ Differential staining ・ Differential sticking ・ Differential stress ・ Differential structure ・ Differential susceptibility hypothesis ・ Differential tariff ・ Differential technological development ・ Differential thermal analysis ・ Differential topology ・ Differential TTL Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Differential rotation ： ウィキペディア英語版 Differential rotation Differential rotation is seen when different parts of a rotating object move with different angular velocities (rates of rotation) at different latitudes and/or depths of the body and/or in time. This indicates that the object is not solid. In fluid objects, such as accretion disks, this leads to shearing. Galaxies and protostars usually show differential rotation; examples in the Solar System include the Sun, Jupiter and Saturn. Around the year 1610, Galileo Galilei observed sunspots and calculated the rotation of the Sun. In 1630, Christoph Scheiner reported that the Sun had different rotational periods at the poles and at the equator, in good agreement with modern values. == The cause of differential rotation == Because of the pre-stellar accretion phase, and the conservation of angular momentum, rotation is induced. Differential rotation is caused by convection in stars. This is movement of mass, due to steep temperature gradients from the core outwards. This mass carries a portion of the star’s angular momentum, thus redistributing the angular velocity, possibly even far enough out for the star to lose angular velocity in stellar winds. Differential rotation thus depends on temperature differences in adjacent regions. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Differential rotation」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.