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Chevron frequency structure in Pc 1 geomagnetic pulsations
Author(s) -
FraserSmith A. C.
Publication year - 1977
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl004i001p00053
Subject(s) - earth's magnetic field , chevron (anatomy) , geology , geomagnetic latitude , latitude , low latitude , geophysics , geodesy , physics , magnetic field , paleontology , quantum mechanics
A new variety of fine frequency structure in Pc 1 geomagnetic pulsations is described. The structure consists of chevron‐shaped tones which, in the examples observed, have their vertices directed either all to the right or all to the left in the spectrograms of a particular pulsations event. The observations of the chevron‐structured events were made at Roberval, Quebec (L ˜ 4; geomagnetic latitude 60°). They appear to be a high‐latitude phenomenon, because no such events have been observed at Stanford, California (L ˜ 2; geomagnetic latitude 43.5°).