geomagneticadj.
/ˌdʒiːə(ʊ)maɡˈnɛtɪk/, U.S. /ˌdʒioʊˌmæɡˈnɛdɪk/ Of or relating to geomagnetism; (also) measured or determined with reference to the earth's magnetic field.
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the world > the earth > earth sciences > geology > geophysics > [adjective] > geomagnetism
geomagnetic1858
magnetotelluric1953
palaeomagnetic1953
1858 E. C. Otté & W. S. Dallas tr. A. von Humboldt Cosmos V. 66 This work has exercised an undoubted influence on the encouragement and better direction of geomagnetic [Ger. geo-magnetischen] studies.
1904 Nature 21 Apr. 581/1 Everyone who has ever been engaged in geomagnetic investigations.
1938 Geogr. Jrnl. 92 386 The position of the Earth's magnetic axis when the distorting effects caused by local conditions of the Earth's crust are eliminated..is known as the Geomagnetic Pole.
1978 Nature 11 May 106/2 Geomagnetic latitudes are displaced southwards of geographic latitudes by 12° maximum at the longitudes of Central and North America.
2008 New Yorker 12 May 76/2 Checking the Alaskan data stations on my laptop, I saw that geomagnetic activity was negligible.
Compounds
geomagnetic field n. the earth's magnetic field.
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1936 Physical Rev. 49 726/1 The geomagnetic field thus provides for the separation of energies required for a spectral analysis of the corpuscular cosmic radiation.
1976 Nature 1 July 8/1 Studying the magnetisation of rocks in order to..define the nature of recent secular variations of the geomagnetic field.
2002 Geophysics in UK (Royal Astron. Soc.) 26/1 The geomagnetic field is generated in the Earth's outer core, which is made predominantly of liquid iron.
geomagnetic pole n. either of the two points at which the axis of the earth's magnetic field, approximated by a simple dipole with an axis running through the centre of the earth, intersects the surface; cf. pole n.2 6b.The geomagnetic poles are near to but distinct from the geographical and magnetic poles.
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1933 Trans. Amer. Geophysical Union 14 158 This..Polar-Year expedition in northern Greenland is taking cosmic-ray data near the geomagnetic pole.
1958 A. Marshack World in Space vi. 100 We know now that this is due to the ‘lines of force’ around the earth which become increasingly vertical as one approaches the geomagnetic pole.
2007 Globe & Mail (Canada) (Nexis) 14 Apr. a3 Besides the North Geographic Pole, people pay thousands to journey to the North Magnetic Pole..and the North Geomagnetic Pole, the north end of the axis of the geomagnetic field that surrounds the Earth and extends into space.
geomagnetic storm n. a worldwide major disturbance of the earth's magnetic field caused by the interaction of the earth with high-speed charged particles ejected from the sun following a solar flare; cf. magnetic storm n. at magnetic adj. and n. Compounds.
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1940 S. Chapman & J. Bartels Geomagnetism I. ix. 331 (caption) The Seddin records of two great geomagnetic storms.
1989 Omni Dec. 68/3 Intense bombardments by extra energetic particles from the sun are recognized today as geomagnetic storms.
2003 New Yorker 10 Nov. 48/2 Satellite signals were lost as solar flares sent geomagnetic storms into Earth's atmosphere.
Derivatives
ˌgeomagˈnetically adv. by geomagnetism, as regards geomagnetism.
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1941 Proc. Amer. Philos. Soc. 84 288 The intensity of the ionizing solar wave-radiation absorbed in the ionosphere on the daylight hemisphere can likewise be measured geomagnetically in the amplitudes of the daily solar magnetic variation.
1970 Nature 23 May 740/1 The contribution of ionospheric currents should predominate..on days which are not geomagnetically disturbed.
2001 Canad. Geographic Nov. 32/1 The geomagnetically induced currents (GIC) produced by such deposits can migrate to powerlines and pipelines, impeding the functioning of vital services.
This entry has been updated (OED Third Edition, March 2012; most recently modified version published online March 2022).
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adj.1858