. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 90" 270'. Fig. 11. Harmonic dials of seasonal mean lunar Mj magnetic variation A cos {uit+6) of the various components for San Miguel and Toledo. Seasonal means (Sp, spring; S, summer; F, fall; W, winter) based on data available from 1951-56. Phases refer to zero hour, 1951 January 1 Large outer circles correspond to four gammas amplitude. Small circles have radii equal to rms amplitude of background and are centred on mean amplitudes and
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 90" 270'. Fig. 11. Harmonic dials of seasonal mean lunar Mj magnetic variation A cos {uit+6) of the various components for San Miguel and Toledo. Seasonal means (Sp, spring; S, summer; F, fall; W, winter) based on data available from 1951-56. Phases refer to zero hour, 1951 January 1 Large outer circles correspond to four gammas amplitude. Small circles have radii equal to rms amplitude of background and are centred on mean amplitudes and phases. lunar Mj magnetic variations and Table 8, the A^2 variation. The rms amplitudes ^ of the background were determined from the mean coefficients excluding « = 10, 13, 14, 15 and 20. Seasonal and yearly mean amplitudes and phases from Table 7 are presented pictorially as harmonic dials in Figs 11 and 12 for the various components and stations. Circles having radii equal to the amplitude ^ of the background are centred on the mean Mj amplitude and phase. If the background is Gaussian noise there is a 63 per cent chance that the circle contains the true value of the periodic part of the signal. Discussion of results. The seasonal mean of the M2 magnetic variation for San Miguel AD changes, season by season, quite similarly as Toledo AD, see Fig. 11. For example, the phase of Toledo AD differs, season by season, from the phase of San Miguel AD by an amount which is nearly twice the difference in longitude between the two stations while the amplitudes, season by season, are nearly the same. The same applies for the seasonal changes of San Miguel AH and Toledo AH. The seasonal changes for San Miguel AZ and Toledo AZ, however, are not similar. After correcting the phases for the difference in longitude, one finds that the amplitude of AZ for San Miguel is about four gammas larger with slight seasonal dependency. The interpretation of these results is the following: The h
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