Dispersion characteristics and waveform analysis of tweek atmospherics
Abstract
A theoretical analysis of the frequency characteristics and the waveforms of tweeks is presented. In the waveform analysis the mode current method, which is based on the source current expansion and the multireflection, is employed. In the theory, the electric images are used to Fourier-expand the source current. The calculated frequency dispersion and the first-mode waveform are compared with the observed ones. An expression is proposed for the source current waveform which yields both positive and negative swings of the radiation field. The number of reflections of a typical tweek wave is a few hundreds. A constant number of reflections should be applied throughout all modes.
- Publication:
-
Environmental and Space Electromagnetics
- Pub Date:
- 1991
- Bibcode:
- 1991ese..book..227Y
- Keywords:
-
- Atmospherics;
- Ionospheric Propagation;
- Propagation Modes;
- Wave Dispersion;
- Waveforms;
- Frequency Response;
- Sonograms;
- Geophysics