Physics
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ang....38..255g&link_type=abstract
Annales de Geophysique, vol. 38, July-Sept. 1982, p. 255-265.
Physics
Annual Variations, Atmospheric Tides, Geomagnetism, Lunar Tides, Magnetic Variations, Solar Terrestrial Interactions, Auroral Zones, Earth-Moon System, Extreme Ultraviolet Radiation, Geomagnetic Latitude, Harmonics, Ionospheric Currents, North America, South America
Scientific paper
Data on magnetic solar (S) and lunar (L) tides taken by stations in the American sector at 10 stations were employed to study seasonal variations, as well as to determine the S and L harmonic coefficients. Previous observations of enhancement of the L-tide in January were not confirmed by the present study, which considered longer-term data. The more comprehensive data did, however, indicate a semi-annual variation of lunar harmonics with maxima associated with the equinoctial months, and a minimum in July in several cases. It is suggested that an influx of FUV radiation is a significant factor in the production of the semi-annual L variations, which are larger in the northern winter than the northern summer. A peak level of a few of the S and L harmonics were observed in August. Finally, the month to month amplitude and phase variations in the midday tide measured at midlatitudes were determined to be similar to the behavior of the L2 magnetic tide.
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