Spectra of irregularities of the high-latitude lower ionosphere according to phase VLF measurements
Abstract
Experimental data on VLF paths at different orientations and frequencies were used to determine spectra of irregularities of the high-latitude lower ionosphere in the range (1.5-100) x 10 to the -5th/m for quiet and disturbed geophysical conditions. It is shown that all the spectra are described well by a power function with an exponent of about 0.9-1.1. On all the auroral paths studied, the intensity of the spectral components is 2-3 times greater in active periods than in quiet conditions. On a transpolar path at sunset, the intensity increases by 1.5-3 times with increasing activity in the low-frequency part of the spectrum. Purely noctural spectra for quiet and disturbed conditions are practically the same.
- Publication:
-
Investigation of the High-Latitude Ionosphere and Magnetosphere of the Earth
- Pub Date:
- 1982
- Bibcode:
- 1982ihli.book...83B
- Keywords:
-
- Auroral Absorption;
- Ionospheric Electron Density;
- Ionospheric Propagation;
- Polar Regions;
- Spectrum Analysis;
- Diurnal Variations;
- Fluctuation Theory;
- Geomagnetism;
- Lower Ionosphere;
- Magnetic Disturbances;
- Phase Shift;
- Signal Measurement;
- Very Low Frequencies;
- Geophysics