Studies in Terrestrial Magnetism
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The annual variation of absolute ranges may be represented, like that of the inequality ranges, by Fourier series with periods of twelve months and its submultiples.
Digitized by VjOOQIC 88 TERRESTRIAL MAGNETISM CHAP.
Using the same terminology as in Table XXVI., we have the results given in Table XXIX.
TABLE XKlX-.—Annwil Variation of Absolute Declination Ranges at Kew, Fourier Coefficients.
- Pi.
..
h- tfa.
Pl/M.
P2IM.
P2/P1.
Quiet days Ordinary days .
All days 3-34 2-15 1-67 114 1-40 1-64 28...0 281 295 282 285 287 0-35 017 012 012 Oil 0-12 0-34 0-66 0-98 If we contrast the quiet day results in Table XXIX.
with the corresponding results for inequality ranges in Table XX VL, we find a reduction in both Pi and P^y but P2/P1 is slightly larger for the absolute range than for the inequality range. The values of 0i and 62 for the absolute range exceed those for the inequality range by 5*" and 9** respectively, representing an advance of some five days in the times of the maxima.
In the case of ordinary days, while Pi is less for the absolute than the inequality range, the contrary is true of P2 ; and P2/P1 is fully twice as big for the former range as the latter.
What to read after Studies in Terrestrial Magnetism?
You can find similar books in the "Read Also" column, or choose other free books by Charles Chree to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The annual variation of absolute ranges may be represented, like that of the inequality ranges, by Fourier series with periods of twelve months and its submultiples.
Digitized by VjOOQIC 88 TERRESTRIAL MAGNETISM CHAP.
Using the same terminology as in Table XXVI., we have the results given in Table XXIX.
TABLE XKlX-.—Annwil Variation of Absolute Declination Ranges at Kew, Fourier Coefficients.
- Pi.
..
h- tfa.
Pl/M.
P2IM.
P2/P1.
Quiet days Ordinary days .
All days 3-34 2-15 1-67 114 1-40 1-64 28...0 281 295 282 285 287 0-35 017 012 012 Oil 0-12 0-34 0-66 0-98 If we contrast the quiet day results in Table XXIX.
with the corresponding results for inequality ranges in Table XX VL, we find a reduction in both Pi and P^y but P2/P1 is slightly larger for the absolute range than for the inequality range. The values of 0i and 62 for the absolute range exceed those for the inequality range by 5*" and 9** respectively, representing an advance of some five days in the times of the maxima.
In the case of ordinary days, while Pi is less for the absolute than the inequality range, the contrary is true of P2 ; and P2/P1 is fully twice as big for the former range as the latter.
What to read after Studies in Terrestrial Magnetism?
You can find similar books in the "Read Also" column, or choose other free books by Charles Chree to read onlineMoreLess
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