Numerical solution of ionospheric filtration of ULF waves. Part 2: Application
Abstract
The problem of ionospheric correction is still topical from the point of view of micropulsation wave diagnostics of the ionized envelope of the Earth. The micropulsation diagnostics of the magnetosphere make use of natural geomagnetic activity recorded in a network of terrestrial observatories. The material which has so far been recorded, is abundant and, to a considerable extent, also continuous in time and space. However, the available data pertaining to the wave field, recorded at the Earth's surface, do not permit a complete reconstruction of the primary signal above the ionosphere. These data provide us with a number of parameters (amplitudes, phase and polarization characteristics, energy flow, etc.) which enable us to develop methods of modeling various wave-propagation patterns. We are able to evolve a method for eliminating the effect of the ionosphere on the received signal, the method of ionospheric correction. Micropulsations, i.e., ULF signals recorded at the Earth's surface, provide information about the structure and dynamics of the plasma in the magnetosphere which is, however, distorted due to the propagation of electromagnetic (or MHD) waves through the dense layers of the ionosphere. The vertically, strongly inhomogeneous, anisotropic (magneto-active) ionosphere, in which losses occur, may be interpreted as a stratifed inhomogeneous interference filter which deforms the original signal, generated in the magnetosphere.
- Publication:
-
Geophysical Works, 1982, Vol. 30
- Pub Date:
- 1985
- Bibcode:
- 1985geow...30..231P
- Keywords:
-
- Electromagnetic Wave Transmission;
- Extremely Low Radio Frequencies;
- Geomagnetic Micropulsations;
- Ionospheric Disturbances;
- Magnetic Fields;
- Models;
- Numerical Analysis;
- Earth Magnetosphere;
- Electromagnetic Interference;
- Magnetohydrodynamic Waves;
- Geophysics