Seasonal changes in the global lunar geomagnetic variation

Details Seasonal changes in the global lunar geomagnetic variation Seasonal changes in the global lunar geomagnetic variation

Mar 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jatp...41..311s&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 41, Mar. 1979, p. 311-323.

Physics

8

Annual Variations, Geomagnetism, Lunar Tides, Magnetic Variations, Amplitudes, Anomalies, Latitude, Longitude, Phase Deviation

Scientific paper

The seasonal variation of phase and amplitude of the lunar semidiurnal geomagnetic variation is derived by the method of Winch and Cunningham (1972) for a global distribution of stations during 1964-65. Large semiannual variations in amplitude are sometimes found and annual maxima are often in February or August. Some sharp phase changes are seen about October-November similar to those reported in solar semidiurnal winds. In several cases the expected phase change in L(H) with latitude is absent, as is the phase change in L(D) between hemispheres. It is suggested that these latter anomalies may be due to the failure of the lunar dynamo in one hemisphere. Several examples of variations with longitude are shown. Most of the anomalies are also revealed in data from a sunspot maximum period analyzed by Gupta and Chapman (1968).

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