Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980bu...rept.....s&link_type=abstract
Annual Scientific Report, 1 Oct. 1978 - 30 Sep. 1979 Boston Univ., MA. Dept. of Astronomy.
Astronomy and Astrophysics
Astronomy
Ionospheric Disturbances, Ionospheric Electron Density, Periodic Variations, F Region, Harmonics, Lunar Gravitational Effects, Magnetic Effects, Prediction Analysis Techniques, Solar Activity Effects
Scientific paper
Short-term variability of the ionospheric F-region has been studied using total electron content (TEC) data from several North American sites. Specific attention was given to lunar-induced periodicities in TEC and to a general treatment of changes in TEC associated with variations in the height of the F-region (hmF2). In both cases, simple analytical expressions were derived from statistical analysis of the large TEC and hmF2 data bases. These relations are appropriate for updates to model predictions of average conditions during daytime hours. A study of the "geomagnetic ordering" of TEC variability showed that real-time predictive methods can reduce up to 50% of the normal variability. A preliminary analysis of solar wind sector boundary effects suggested that sector components may order some F-region variability, though the specific relations between these effects and the geomagnetic ordering results remain to be clarified.
Mendillo Michael
Schatten Kenneth H.
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