Neil J. Balmforth

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Analytical estimates of the rate at which energy is extracted from the barotropic tide at topography and converted into internal gravity waves are given. The ocean is idealized as an inviscid, vertically unbounded fluid on the f plane. The gravity waves are treated by linear theory and freely escape to z ϭ ϱ. Several topographies are investigated: a(More)
The dynamics of a globally coupled, logistic map lattice is explored over a parameter plane consisting of the coupling strength, ⑀, and the map parameter, a. By considering simple periodic orbits of relatively small lattices, and then an extensive set of initial-value calculations, the phenomenology of solutions over the parameter plane is broadly(More)
Oscillations generated by flow of magmatic or hyrothermal fluids through tabular channels in elastic rocks are a possible source of low-frequency seismicity. We assess the conditions required to generate oscillations of ∼1Hz via hydrodynamic flow insta-bilities (roll waves), flow-destabilized standing waves set up on the elastic channel walls (wall modes),(More)
We present estimates of the amplitudes of intrinsi-cally stable stochastically excited radial oscillations in stars near the main sequence. The amplitudes are determined by the balance between acoustical energy generation by turbulent con-vection (the Lighthill mechanism) and linear damping. Convec-tion is treated with a time-dependent, nonlocal,(More)