Physics
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jatp...43..607c&link_type=abstract
(International Symposium on Equatorial Aeronomy - I, 6th, Aguadilla, PR, July 17-23, 1980.) Journal of Atmospheric and Terrestri
Physics
9
Annual Variations, Equatorial Atmosphere, Geomagnetic Latitude, Geomagnetism, Magnetic Variations, Tropical Regions, Diurnal Variations, Fourier Analysis, Ionospheric Conductivity, Lunar Tides, Nocturnal Variations
Scientific paper
The annual and semiannual variations of the quiet-sun year (1965) geomagnetic field are examined using geomagnetic records obtained from observatories located between about 0 and 30 deg N geomagnetic latitude. Three separate contributions are analyzed: (1) the quiet-day midnight level (MDT), (2) the solar-quiet daily variation (Sq), and (3) the quiet-time lunar semidiurnal tidal variation (L). Methods of three recent studies (Campbell, 1980a, 1980b) are used to emphasize the equatorial features, and the differences in the seasonal amplitude and phase changes, obtained from a Fourier analysis of annual and semiannual components in the three orthogonal magnetic-field directions, are illustrated. Conclusions are presented, including: (1) the equatorial MDT variations of the northward and vertical components at quiet periods seem to represent the expected seasonal nighttime magnetospheric distortions, (2) the seasonal equatorial region Sq follows closely the annual and semiannual patterns expected to be caused by ionospheric conductivity and heating variations that give rise to a dynamo current at E-region heights, and (3) the lunar seasonal variations show characteristics of dayside ionospheric electrojet origin.
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