Latitude and height dependences of solar atmospheric tides

Computer Science – Sound

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Atmospheric Heating, Atmospheric Tides, Pressure Oscillations, Propagation Modes, Solar Heating, Spatial Dependencies, Atmospheric Pressure, Boundary Value Problems, Diurnal Variations, Height, Laplace Equation, Latitude, Solar Gravitation, Sounding Rockets, Weighting Functions

Scientific paper

The equations of classical tidal theory have been used to calculate certain latitude and height dependences that relate to solar atmospheric tides in the troposphere, stratosphere and mesosphere. The latitudinal dependences are Hough functions which are presented graphically for symmetric and asymmetric diurnal and semidiurnal modes. Two height dependences are developed: one is a function which weights the heating rate at any level in proportion to its response in the surface pressure oscillation; the other is a function which weights the heating rate at any level in proportion to its response in the tidal fields at a given higher level. A typical heating rate profile is adopted to which these weighting functions are applied. The surface pressure oscillation and tidal fields at 80 km are discussed in relation to the levels of heating from which they are mainly excited. Phases of the surface pressure oscillation, expressed as the time of maximum pressure, are calculated for several modes and in view of the various assumptions involved agree well with previously reported observational values for symmetric modes.

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