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XXIII.—The Diurnal Incidence of Disturbance in the Terrestrial Magnetic Field

Published online by Cambridge University Press:  06 July 2012

A. Crichton Mitchell
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Extract

1. During recent years increased attention has been paid to the question of measuring or estimating the extent or degree of disturbance in the earth's magnetic field. Two distinct purposes have been kept in view. The first and more general is to provide some measure of disturbance capable of use as a means of correlating terrestrial magnetic change with other geophysical or cosmical phenomena; in particular, solar phenomena. The second seeks to assign to each Greenwich day a numerical value for the degree of disturbance on that day, so that a selection may be made in each month of a certain number of days on which the terrestrial field has been least or most disturbed. The immediate object here is to secure comparability between results—particularly diurnal inequalities—obtained at different magnetic observatories.

Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 57 , Issue 3 , 1934 , pp. 617 - 632
Copyright
Copyright © Royal Society of Edinburgh 1934

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References

page 617 note * Veroffentlichungen des Kaiserlichen Observatoriums in Wilhelmshaven, 1911.

page 617 note † Monthly Notices R.A. Soc., vol. lxxix, p.73.

page 623 note * Goldie, , Trans. Roy. Soc. Edin., vol. lviiGoogle Scholar.

page 627 note * p. 628.

page 631 note * Proc. Roy. Soc., A, vol. cxxx, p. 668.

page 631 note † “Hourly Character Figures of Magnetic Disturbance,” Geophysical Memoirs, vol. iv, No. 32. London, Meteorological Office, 1926Google Scholar.

page 632 note * For data relating to the British area, see Mitchell, A. Crichton, Quart. Journ. Roy. Met. Soc., vol. 1, p. 127;Google Scholar vol. lv, p. 197; vol. lv, p. 309; vol. lvi, p. 76; vol. lvi, p. 171.