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Abstract
§ 1. The present paper gives the results of the spherical harmonic analysis of the quiet solar diurnal variations (Sq) of the Earth's magnetic field for the summer months, May to August, 1933. Schuster [see 1 of “References” at end of paper] was the first to apply in 1889 Gauss's expansion in terms of spherical harmonics to the analysis of diurnal variations. The spherical harmonic analysis of the Earth's permanent and transient magnetic fields is of the utmost importance, first, because it permits generalizing the empirical data in the form of an analytical expression and, second, because it offers information regarding the structure of this field (its potential and its origin). The spherical harmonic analysis of the diurnal variations has therefore been repeatedly undertaken by many investigators [2 to 7]; but from time to time, with accumulation of new observational data (of greater reliability, or referring to other epochs), it becomes desirable to have recourse to new analyses.
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