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English
Etymology
From iso- + Ancient Greekπόρος(póros, “journey”), on the basis that isopors are "lines of equal travel".
(geomagnetism) A line on a map that joins places of equal annual change in a geomagnetic property; an isoporic line.
1938, Cooperation in Research: Carnegie institution of Washington Publication no. 501:
Mapping of the isopors, or lines of equal magnetic change, by the Department disclosed a large number of isoporic foci where the change in the magnetic elements is taking place most rapidly.
