Results 251 to 260 of about 110,240 (298)

Quasi‐geostrophic planetary wave forcing

Quarterly Journal of the Royal Meteorological Society, 1978
AbstractThe problem of stationary planetary wave forcing by orography and longitudinal asymmetry of heating is re‐examined in the light of recent observations and theories of stratospheric motion. It is deduced that the region between 30 and 60km is a sink of planetary wave energy for zonal wavenumbers one and two in winter and that, in contrast to ...
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Planetary waves in rotating ionosphere

Plasma Physics Reports, 2008
The problem of propagation of ultralong planetary waves in the Earth’s upper atmosphere is considered. A new exact solution to the MHD equations for the ionosphere is obtained in spherical coordinates with allowance for the geomagnetic field and Earth’s rotation.
A. G. Khantadze, V. G. Jandieri, G. V. Jandieri   +2 more
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Planetary Wave Climatology Experiments

1983
In order to determine climatic evolution on a seasonal time scale, an understanding of the dynamics of the planetary waves is essential. At Exeter research is centered on using G.C.M.’s to investigate the factors influencing the phasing and amplitudes of these waves. There are two lines of approach in applying G.C.M.’s to climate study. The first is to
N. Murdoch, D. R. Davies, P. J. Everson
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Thermal Equilibration of Planetary Waves

Journal of the Atmospheric Sciences, 1990
Abstract Equilibration of planetary waves toward free-mode forms, steady solutions of the unforced, undamped equations of motion, is studied in a three-level quasi-geostrophic model on the hemisphere. A thermal mechanism is invoked, parameterized as a Newtonian process Q = −γ(T − T*), relaxing the atmosphere toward a radiative-convective equilibrium ...
John Marshall, Damon W. K. So
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Planetary waves on the Sun?

Solar Physics, 1971
Some recent observations of the Sun suggest a class of wave-like motions moving both eastward and westward at a uniform velocity with respect to the mean solar angular velocity. It is suggested that these may be hydromagnetic planetary waves. An estimate of the mean toroidal magnetic field is made, based on a theoretical treatment of such waves already
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PLANETARY WAVES IN THE ATMOSPHERE

Journal of Meteorology, 1954
Abstract A numerical method is presented for solving the non-linear barotropic vorticity equation in spherical coordinates. It is shown that, when the stream function is expressed as a sum of surface spherical harmonics, the barotropic vorticity equation gives rise to harmonic tendency equations which express the time rate of change of the harmonic ...
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Long period divergent planetary waves

Geophysical Fluid Dynamics, 1973
Abstract A simple first order perturbation procedure is used to obtain an equation for divergent planetary waves when the period is much greater than the pendulum day. For unbounded regions the equation is the s2me as one derived by Longuet-Higgins (1965), but in bounded basins it is different.
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Planetary Waves and Zonal Asymmetries

2017
PLANETARY WAVES ARE LARGE-SCALE ROSSBY WAVES in which the potential vorticity gradient is provided by differential rotation (i.e., the beta-effect). They are ubiquitous in Earth's atmosphere and almost certainly in other planetary atmospheres. They propagate horizontally over the two Poles, and they propagate vertically into the stratosphere and ...
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ULF waves in planetary magnetospheres

2006
Ultra-low frequency (ULF) waves are messengers in space plasmas. They communicate information about unstable, free-energy-containing plasma configurations, transient phenomena, or obstacles in flowing plasmas; they transport energy between different parts of magnetospheric systems; and they serve as momentum coupling agents between remote regions such ...
Karl-Heinz Glassmeier, Jared Espley
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Eddies Masquerade as Planetary Waves

Science, 2011
Variabilities in sea-level and upper-ocean chlorophyll reveal the systematic influence of nonlinear eddies.
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