Physics
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ang....31..419m&link_type=abstract
Annales de Geophysique, vol. 31, Oct.-Dec. 1975, p. 419-431. In French.
Physics
Annual Variations, Earth-Moon System, Geomagnetism, Lunar Effects, Magnetic Variations, Solar Activity Effects, Twenty-Seven Day Variation, Atmospheric Effects, Earth Ionosphere, Earth Magnetosphere, Kp Index, Magnetic Signatures, Statistical Tests, Tables (Data)
Scientific paper
A 103-year (1868-1970) series of the 3-hour geomagnetic aa indices is used to study a geomagnetic activity effect thought associated with the revolution of the moon around the earth. The feasibility of employing the persistence test of Bartels applied semi-annual and 27-day magnetic variations to study the lunar effect is examined. It is shown that the response of this statistical test to the semi-annual variation corresponds to a periodic variation persisting as long as the response, while the response to the 27-day variation corresponds predominantly to a quasi-persistent asymptotic variation. The lunar effect in the ionosphere and magnetosphere is investigated. It is concluded that there is no lunar effect on geomagnetic activity and that magnetic variations thought associated with this effect are due to solar activity.
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