LF propagation: An overview
Abstract
A survey of those areas where knowledge of LF propagation is inadequate is presented. Studies of propagation on a global scale are stressed. Propagation at frequencies in the LF band (30 to 300 kHz) alter with change in frequency, but there is a drastic difference between propagation characteristics in these adjacent bands. Ionospheric attenuation therefore increases rapidly with frequency, particularly during summer day time. The radiation field and its measurement is discussed. Diurnal variations in phase and amplitude, the variation of amplitude with the solar cycle, and solar/geophysical disturbance variations and post-magnetic storm effects are considered.
- Publication:
-
In AGARD Medium
- Pub Date:
- February 1982
- Bibcode:
- 1982mlvl.agarS....B
- Keywords:
-
- Diurnal Variations;
- Ionospheric Propagation;
- Low Frequencies;
- Pulse Amplitude;
- Radio Waves;
- Annual Variations;
- Attenuation;
- Ionospherics;
- Magnetic Storms;
- Radio Frequency Interference;
- Communications and Radar