Results 241 to 250 of about 829,957 (291)
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Journal of the Atmospheric Sciences, 1981
Abstract Ultralong and long planetary waves are analyzed at the 500 mb level in terms of their amplitudes, phases and stationarity characteristics, the latter described in terms of a stationarity index SIn. This index consists of the ratio between planetary-wave amplitudes computed from time-averaged 500 mb height patterns, and the wave amplitudes ...
Elmar R. Reiter, Daniel Westhoff
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Abstract Ultralong and long planetary waves are analyzed at the 500 mb level in terms of their amplitudes, phases and stationarity characteristics, the latter described in terms of a stationarity index SIn. This index consists of the ratio between planetary-wave amplitudes computed from time-averaged 500 mb height patterns, and the wave amplitudes ...
Elmar R. Reiter, Daniel Westhoff
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PLANETARY WAVES IN THE ATMOSPHERE
Journal of Meteorology, 1954Abstract 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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Deep Sea Research Part B. Oceanographic Literature Review, 1987
Abstract A number of general circulation models have recently been proposed that compute the steady-state structure of the general circulation. Observation of 18°C water formation, on the other hand, suggest the need for a study of the time-dependent large-scale structure of the oceans.
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Abstract A number of general circulation models have recently been proposed that compute the steady-state structure of the general circulation. Observation of 18°C water formation, on the other hand, suggest the need for a study of the time-dependent large-scale structure of the oceans.
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Nonlinear density waves in planetary rings
Icarus, 1986We discuss the steady-state structure of the nonlinear density waves generated in a planetary ring at the Lindblad resonances of a satellite. We show that strong density waves lead to an enhancement of the background surface density in the wave zone.
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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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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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AIP Conference Proceedings, 1986
Three planets, the earth, Jupiter and Saturn are known to emit nonthermal radio waves which require coherent radiation processes. The characteristic features (frequency spectrum, polarization, occurrence probability, radiation pattern) are discussed. Radiation which is externally controlled by the solar wind is distinguished from internally controlled ...
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Three planets, the earth, Jupiter and Saturn are known to emit nonthermal radio waves which require coherent radiation processes. The characteristic features (frequency spectrum, polarization, occurrence probability, radiation pattern) are discussed. Radiation which is externally controlled by the solar wind is distinguished from internally controlled ...
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Journal of Fluid Mechanics, 1967
A study is made of hydromagnetic oscillations in a rotating fluid sphere. The basic state is chosen as a uniform current parallel to the axis of rotation. It is found that the non-dissipative normal modes are described by a modified form of the Poincaré eigenvalue problem. For small rotation rates, the lowest non-axisymmetric modes are unstable.
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A study is made of hydromagnetic oscillations in a rotating fluid sphere. The basic state is chosen as a uniform current parallel to the axis of rotation. It is found that the non-dissipative normal modes are described by a modified form of the Poincaré eigenvalue problem. For small rotation rates, the lowest non-axisymmetric modes are unstable.
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2007
This chapter describes solitary waves in the atmosphere and ocean with diameters from perhaps a hundred kilometers to scales larger than the earth: vortices embedded in a shear zone, Rossby solitons and equatorial Kelvin solitary waves among others. One theme is that while nonlinear coherent structures are readily identified in both observations and ...
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This chapter describes solitary waves in the atmosphere and ocean with diameters from perhaps a hundred kilometers to scales larger than the earth: vortices embedded in a shear zone, Rossby solitons and equatorial Kelvin solitary waves among others. One theme is that while nonlinear coherent structures are readily identified in both observations and ...
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Planetary Waves in the Ionosphere
1998Abstract : The objectives of this grant are to delineate and to better understand oscillations in ionospheric structure which occur at planetary-wave periods (i.e., 2-10 days). Effort has concentrated on analyses of about 30 years' of archived ionosonde data from a global array of stations, and some satellite-based measurements of total electron ...
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Quasi‐geostrophic planetary wave forcing
Quarterly Journal of the Royal Meteorological Society, 1978AbstractThe 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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