Azimuthal modes of the geomagnetic field.
Abstract
The concept of the energy spectrum of azimuthal modes (or m-modes) is introduced. The latitudinal amplitude distribution of the m-modes on the earth's surface is determined along with their asymmetry with respect to the equator; the mode with m greater than 2 is susbtantially weaker in amplitude than the principal modes, m = 0, 1, 2. A comparison of radial spectral distributions of the n and m modes indicates that determinations of the depth of a geomagnetic-field source using the 'white noise' concept are inadequate.
- Publication:
-
Geomagnetism and Aeronomy
- Pub Date:
- December 1990
- Bibcode:
- 1990Ge&Ae..30.1022R
- Keywords:
-
- Azimuth;
- Geomagnetism;
- White Noise;
- Energy Spectra;
- Gauss Equation;
- Magnetic Fields;
- Spectral Energy Distribution;
- Spherical Harmonics;
- Geomagnetic Field: Structure