Contour maps of the geomagnetic diurnal variation

Details Contour maps of the geomagnetic diurnal variation Contour maps of the geomagnetic diurnal variation

Feb 1966

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1966jatp...28..165h&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 28, no. 2, pp. 165-173

Physics

1

Scientific paper

A method is described for contouring the diurnal changes in the magnetic elements provided by published observatory tabulations of mean hourly values of mean monthly days. By projecting the position of the observatory onto a geocentric sphere which remains fixed in relation to the Sun, then throughout the course of a year a zone 47° wide is scanned by the observatory on the trajectories of which the diurnal changes of the elements can be inserted. On contouring the data, maps are produced illustrating the progressive seasonal and annual changes of the diurnal field as viewed from the Sun. Examples are given for Toolangi (H, Z) for the 5 yr preceding the I.G.Y. and for Macquarie Island and Heard Island (H, Z), 1953.

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