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dayside Pi 2 pulsations at low latitudes
Author(s) -
Sutcliffe Peter R.,
Yumoto Kiyohumi
Publication year - 1989
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/gl016i008p00887
Subject(s) - daytime , latitude , low latitude , earth's magnetic field , geophysics , middle latitudes , high latitude , pi , physics , atmospheric sciences , geology , geodesy , magnetic field , chemistry , biochemistry , quantum mechanics
In this paper we investigate the occurrence of dayside Pi 2 geomagnetic pulsations at low and mid latitudes. The technique of data adaptive filtering is used to identify Pi 2's concealed by the presence of typical daytime Pc type pulsations. Convincing new evidence is presented demonstrating that Pi 2 pulsations occur simultaneously in both the nightside and dayside hemispheres at low latitudes. Dayside Pi 2's are occasionally identified at mid latitudes. These results have implications with regard to the source mechanism for low latitude Pi 2 pulsations and allude to a global cavity mode.