Physics
Scientific paper
Aug 1967
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967jatp...29..917m&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 29, no. 8, pp. 917-936
Physics
3
Scientific paper
Ionospheric winds required to produce the lunar daily geomagnetic variations are deduced from the atmospheric dynamo theory that takes into account the electric linkage between conjugate points in the northern and southern hemispheres. The electrical conductivity of the ionosphere is first estimated on the basis of atmospheric and ionospheric models for a moderate state of solar activity, and wind systems are then calculated separately for two supposed current layers (thick and thin) and also for three different seasons (D, E and J months). It is found that the amplitudes of wind velocities in middle latitudes are about 10 m/sec for the thick layer and about 15 m/sec for the thin layer, and that the phases are such that the wind systems have two sources around 9 hr and 21 hr and two sinks around 3 hr and 15 hr in lunar time. There is a tendency that the amplitudes of winds are a little larger in winter than in summer, and the phases are advanced systematically from summer to winter. The results are discussed by comparing with other theoretical and observational results, and suggest a purely tidal origin of the lunar daily geomagnetic variations.
Fujiwara Motoyasu
Maeda Hideki
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