Statistics – Computation
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ang....38..267s&link_type=abstract
Annales de Geophysique, vol. 38, July-Sept. 1982, p. 267-270.
Statistics
Computation
Annual Variations, Atmospheric Tides, Geomagnetism, Lunar Tides, Magnetic Variations, Solar Terrestrial Interactions, Diurnal Variations, Earth-Moon System, Fourier Analysis
Scientific paper
The results of various calculational methods for characterizing the seasonal and annual variations in the geomagnetic field elements are examined, and the solar (S) and lunar (L) annual and semiannual variations are determined. It is shown that use of Fourier analysis for monthly geomagnetic amplitudes will falsely imply a seasonal variation when phase is not taken into account. An analytical examination of the diurnal and semidiurnal components of the S magnetic tide is carried out. The analysis, when applied to the H-component measured at Fredericksburg, reveals two semiannual amplitude maxima in the semidiurnal term which could, with less computational definition, be interpreted as a semiannual variation. The semidiurnal component of the L magnetic tide is studied and the in-phase annual locations of the L H-components at Victoria and Fredericksburg are calculated. The seasonal change in the L variation is determined to be much greater than the solar variation, e.g., 0.29 for S and 0.47 for L at Fredericksburg.
Stening Robert J.
Winch Denis E.
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