TWO-DIMENSIONAL CALCULATIONS OF MAGNETIC MICROPULSATION RESONANCES
MASSACHUSETTS INST OF TECH CAMBRIDGE
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Magnetic micropulsations in the period range of 5 to 45 seconds have been interpreted as a resonant amplification of waves in the ionosphere. The wave involved is of the type which is not guided by the earths magnetic field. A resonance can occur, because the wave energy is trapped by the rapid increase with height of the Alfven wave velocity above the F2 peak. Previous theoretical investigations of this resonance have been limited to models for the ionosphere in which the properties could only vary with height and not with horizontal position. This study considers the effect of horizontal variations, by examining the solutions of two-dimensional models. The first model simulates longitude independent propagation in a spherical earth-ionosphere. The horizontal variation is introduced by the inclusion of a dipole magnetic field. The second model is a cylindrical model. In this model the ionospheric parameters, such as the electron density, vary with the angular coordinate. Both two-dimensional models were solved by the use of finite difference methods.
- Atmospheric Physics