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Schmucker, 1970 (Scripps) - MTNet

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<strong>Schmucker</strong>: Geomagnetic Variations 91<br />

semicircular elevation is that of a 2 -dimensional dipole, superimposed upon<br />

a uniform horizontal field, when the field distribution in the z-plane is uniform<br />

and horizontal. Thus,<br />

2<br />

hH(u, v) = (R/r) cos 28<br />

2 .<br />

zH(u,v) =(R/r) sm 28<br />

(6.28)<br />

with cos 8 = ulr and l == u2 + }.<br />

The anomalous field of model "b" in figure 3S has been derived from these<br />

formulae. Similar profiles above elevations of semi elliptic and triangular<br />

cross section can be found in Rikitake and Witham's article (1964, pp. 40,<br />

41).

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