Physics – Fluid Dynamics
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pepi...24..308s&link_type=abstract
Physics of the Earth and Planetary Interiors, vol. 24, Mar. 1981, p. 308-319. Research supported by the National Research Counc
Physics
Fluid Dynamics
50
Compressibility Effects, Earth Core, Rotating Fluids, Seismic Waves, Terradynamics, Wave Equations, Dynamo Theory, Earth Movements, Fluid Dynamics, Gravity Waves, Partial Differential Equations, Rotating Fluids
Scientific paper
It is shown that in the dynamics of a deep fluid of planetary scale such as the earth's core, compressibility, stratification and self-gravitation are all important as well as rotation. The existing proof of Cowling's theorem prohibiting nonstationary axisymmetric dynamos, and the application of the Proudman-Taylor theorem to core flows, both based on the assumption of solenoidal flow, need to be reconsidered. For sufficiently small (subacoustic) frequencies or reciprocal time scales, an approximation which neglects the effect of flow pressure on the density is valid. This is called the subseismic approximation and it is shown that it leads to a new second-order partial differential equation in a single scalar variable describing the low frequency dynamical behavior. The new subseismic wave equation allows a direct connection to be made between the various possible physical regimes of core structure and its dynamics.
Rochester Michael G.
Smylie Douglas E.
No associations
LandOfFree
Compressibility, core dynamics and the subseismic wave equation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Compressibility, core dynamics and the subseismic wave equation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Compressibility, core dynamics and the subseismic wave equation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1039159