Temporal and spatial distribution of the spectral components of foF2
Abstract
A spectral analysis of almost all available monthly median of the maximum plasmafrequency in the F-region (foF2) was performed. Some evidence for a significant tidal influence on the diurnal and semidiurnal variation has been found. The declination effect (Eyfrig, 1963) appears in our spectral presentation as a dependence of the degree of the seasonal variation and of the phase of the 24 hour period on the magnetic declination. The most peculiar phenomenon is the different variation of the annual component in North America and Eurasia with the sunspot number. There are several indications that the variation of foF2 is also influenced by the variation of the gravitational potential. Some other results are presented which are believed to be related to dynamic processes in the F-region.
- Publication:
-
Journal of Atmospheric and Terrestrial Physics
- Pub Date:
- February 1978
- DOI:
- 10.1016/0021-9169(78)90017-X
- Bibcode:
- 1978JATP...40..135P
- Keywords:
-
- F Region;
- Plasma Frequencies;
- Solar Cycles;
- Spatial Distribution;
- Spectrum Analysis;
- Annual Variations;
- Diurnal Variations;
- Gravitational Fields;
- Sunspots;
- Traveling Ionospheric Disturbances