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Rapid Geomagnetic Field Variations Observed at Conjugate Locations
Author(s) -
Campbell Wallace H.
Publication year - 1968
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1002/rds196837726
Subject(s) - earth's magnetic field , magnetosphere , geophysics , conjugate , conjugate points , amplitude , magnetic field , latitude , physics , polarization (electrochemistry) , atmospheric sciences , low latitude , geology , ionosphere , geodesy , computational physics , geometry , mathematics , optics , mathematical analysis , chemistry , quantum mechanics
In the frequency range of 4.0 to 0.002 Hz natural rapid variations of the magnetic field of the earth have been reported to occur at pairs of near‐geomagnetically conjugate locations in the Northern and Southern Hemispheres. This paper is a review of the present knowledge of such phenomena. At conjugate auroral and subauroral latitude stations, the pulsations of irregular amplitude variation ( pi ) which are associated with particle precipitation, are, at times, simultaneous and of identical form, but on occasions quite dissimilar activity occurs. The pulsations with a smooth, more sinusoidal form ( pc ) are generally quite similar at conjugate locations. Polarization determinations of the pc 's have been most recently investigated to determine the propagation characteristics of hydromagnetic waves in the magnetosphere. Similar rapid magnetic field variations at low latitude and equatorial stations are often found at many widely spaced stations not necessarily conjugate.