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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Blandford–Znajek process ： ウィキペディア英語版 Blandford–Znajek process The Blandford–Znajek process is a mechanism for the extraction of energy from a rotating black hole,〔, (Chapter 8.9: Black Holes in External Magnetic Field)〕 introduced by Roger Blandford and Roman Znajek in 1977.〔R. D. Blandford and R. L. Znajek, "Electromagnetic extraction of energy from Kerr black holes", (Mon. Not. R. Astr. Soc. 179:433-456 (1977) )〕 It is one of the best explanations for the way quasars are powered.〔http://everything2.com/title/Blandford%2520Znajek%2520process〕 As in the Penrose process, the ergosphere plays an important role in the Blandford–Znajek process. In order to extract energy and angular momentum from the black hole, the electromagnetic field around the hole must be modified by magnetospheric currents. In order to drive such currents, the electric field needs to not be screened, and consequently the vacuum field created within the ergosphere by distant sources must have an unscreened component. The most favoured way to provide this is an e+/- pair cascade in a strong electric and radiation field.〔Camenzind, M.: "Compact objects in Astrophysics" (Springer 2007, ISBN 978-3-540-25770-7), p. 500, 505〕 As the ergosphere causes the magnetosphere inside it to rotate, the outgoing flux of angular momentum results in extraction of energy from the black hole. The Blandford–Znajek requires an accretion disc with a strong poloidal magnetic field around a spinning black hole. The magnetic field extracts spin energy and the power can be estimated as the energy density at the speed of light cylinder times area: : $P=B^2\backslash left(\backslash frac\backslash right)^4\; r\_c\; c=\backslash frac$ where B is the magnetic field strength, $r\_c$ the speed of light radius and ''ω'' the angular velocity.〔Relativistic Astrophysics and Cosmology Lecture Notes, A. Lasenby, Cambridge University, 2010-2011.〕 == References == 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「Blandford–Znajek process」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.