Physics
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ang....38...55d&link_type=abstract
Annales de Geophysique, vol. 38, Jan.-Mar. 1982, p. 55-59. Research supported by the Council of Scientific and Industrial Resea
Physics
Atmospheric Attenuation, Atmospheric Tides, Ionospheric Propagation, Lunar Tides, Solar Activity Effects, Annual Variations, Diurnal Variations, Electromagnetic Absorption
Scientific paper
The results of an analysis of the lunar-cycle correlated variations of the noontime average of ionospheric absorption at 2.2 MHz frequency studied for three years at Ahmedabad are reported. The deviative part of the total absorption was found to be near 20 percent. The seasonal influence on absorption was eliminated by averaging the L-values for each phase-group in addition to deleting all abnormally high and low values. The mean values of the absorption L were categorized into 24 lunar phases and subjected to a harmonic analysis, which revealed a monthly diurnal wave of 0.29 db amplitude and a semidiurnal wave with a 0.56 db amplitude. Large variations with season and solar activity were concluded to occur, as well as with radio frequency absorption. An observation period of 9-12 years is concluded to be required in order to acquire statistical significance for the observed lunar tidal variations.
Datta G.
Kotadia K. M.
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