Geomagnetic tides in horizontal intensity at Huancayo, Part II

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<jats:p>After the completion of Part I and of the summary [reference 4 in Part I], a new viewpoint was found which seemed likely to lead to better methods than those used hitherto in the computation of the lunar diurnal variation L, for the main term <jats:italic>L</jats:italic>(<jats:italic>M</jats:italic><jats:sub>2</jats:sub>) arising from the partial tide <jats:italic>M</jats:italic><jats:sub>2</jats:sub> and also the subsidiary terms depending on lunar distance. This led to a “principle of efficient sampling in geophysical statistics” (21), a general expression for ideas underlying previous work. This principle when applied to present methods of computing L, reveals the main reason for the rather unsatisfactory results of former computations on L. These results showed irregularities indicating the presence of large residuals due to non‐lunar influences, both “regular” (such as that due to the average value of the solar daily variations S)—believed to be eliminated—and “irregular” (such as that due to disturbance or the variability of S)—believed to be sufficiently “overwhelmed” by combining a great number of observations.</jats:p>

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