%0 Journal Article %T Dissipation at the core-mantle boundary on a small-scale topography %+ Institut de Physique du Globe de Paris (IPGP) %+ Institutes of Applied and Industrial Mathematics %A Le Mouël, Jean-Louis %A Narteau, C %A Greff-Lefftz, M %A Holschneider, M %< avec comité de lecture %@ 0148-0227 %J Journal of Geophysical Research %I American Geophysical Union %V 111 %N B4 %P B04413 %8 2006 %D 2006 %R 10.1029/2005JB003846 %Z Sciences of the Universe [physics]/Earth SciencesJournal articles %X The parameters of the nutations are now known with a good accuracy, and the theory accounts for most of their values. Dissipative friction at the core-mantle boundary (CMB) and at the inner core boundary is an important ingredient of the theory. Up to now, viscous coupling at a smooth interface and electromagnetic coupling have been considered. In some cases they appear hardly strong enough to account for the observations. We advocate here that the CMB has a small-scale roughness and estimate the dissipation resulting from the interaction of the fluid core motion with this topography. We conclude that it might be significant. %G English %2 https://insu.hal.science/insu-01267531/document %2 https://insu.hal.science/insu-01267531/file/JGR-Le-Mouel-Narteau-2006.pdf %L insu-01267531 %U https://insu.hal.science/insu-01267531 %~ INSU %~ UNIV-PARIS7 %~ AFRIQ %~ CNRS %~ IPGP %~ SORBONNE-UNIVERSITE %~ UNIV-PARIS %~ SU-TI %~ ALLIANCE-SU