. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 270. Fig. 12. Harmonic dials of seasonal mean lunar Mi magnetic variation A cos (to/ -|- 6) of the various components for Honolulu and Tamanrasset. See legend for Fig. 11. is due mostly to an oceanic source because of its large amplitude relative to Toledo AZ. The oceanic part is estimated to have an amplitude 3-8 gammas and a phase 153° relative to zero hour, 1951 January 1 The small seasonal changes of the vertical Mj variation at San Miguel
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 270. Fig. 12. Harmonic dials of seasonal mean lunar Mi magnetic variation A cos (to/ -|- 6) of the various components for Honolulu and Tamanrasset. See legend for Fig. 11. is due mostly to an oceanic source because of its large amplitude relative to Toledo AZ. The oceanic part is estimated to have an amplitude 3-8 gammas and a phase 153° relative to zero hour, 1951 January 1 The small seasonal changes of the vertical Mj variation at San Miguel are probably due to an ionospheric source. These conclusions are consistent with the facts, (i) that oceanic tidal induced varia- tions should show negligible seasonal dependency, and (ii) that if there were only an ionospheric source present, the vertical M2 magnetic variation at San Miguel should follow closely the seasonal change of the horizontal variations at San Miguel. The N2 vertical magnetic variation, detected at San Miguel, see Table 8, lends support- ing evidence that the vertical lunar semidiurnal variations at San Miguel are due mostly to an oceanic source. For example, the yearly mean for San Miguel AZ gives an amplitude ratio N2/M2 = 0'25 and phase difference 0^^ — d„^= 58°, simi- larly the tides at San Miguel yield N2/M2 = 0-23 and 0^,-0^^ = 42°. Interpretation of the harmonic dials (Fig. 12) for Honolulu and Tamanrasset is not quite as clear. This is probably a result of the large differences in longitude between the two stations. Comparison of the harmonic dials suggest a possibility that part of the Mj variation in Honolulu AD has an oceanic source. This variation is estimated to have an amplitude 0-5 gammas and phase 22°. The evidence for this variation of oceanic origin, however, is highly tenuous. Table 8 Seasonal and yearly mean lunar N2 magnetic variation A cos (at+6) and amplitude .^. Phases refer to zero hour 1965 January 1 and
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