Global induction and the spatial structure of mid-latitude geomagnetic variations

Details Global induction and the spatial structure of mid-latitude geomagnetic variations Global induction and the spatial structure of mid-latitude geomagnetic variations

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992geoji.110..251b&link_type=abstract

Geophysical Journal International (ISSN 0956-540X), vol. 110, no. 2, Aug. 1992, p. 251-266.

Physics

13

Electromagnetic Spectra, Geomagnetic Pulsations, Periodic Variations, Temperate Regions, Frequency Ranges, Mathematical Models, Spatial Distribution, Spherical Harmonics

Scientific paper

A prerequisite for more accurate estimates of the electromagnetic response of the earth is a better understanding of the origin and spatial structure of geomagnetic time variations with periods of a few hours to several years. A period band centered on two days has been isolated from two years of hourly mean values recorded at 130 observatories. Results provide clear evidence for the existence of two groups of sources characterized by the spatial scales of the magnetic variation fields produced at a period of two days.

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