Premium
Coherent Pc 3 pulsations in the prenoon sector observed along the 210° magnetic meridian
Author(s) -
Tanaka Y.M.,
Yumoto K.,
Shinohara M.,
Kitamura T.I.,
Solovyev S. I.,
Vershinin E. F.,
Fraser B. J.,
Cole D.
Publication year - 1998
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 - 10.1029/98gl02627
Subject(s) - magnetosphere , meridian (astronomy) , magnetic field , geophysics , magnetometer , physics , geology , field line , equator , northern hemisphere , magnetic dip , southern hemisphere , geodesy , atmospheric sciences , latitude , astronomy , quantum mechanics
We studied the coherence and phase structure of Pc 3 pulsations in the H and D components of the magnetic field observed at latitudinally distributed stations along the 210° magnetic meridian by using the H component at GUA ( L = 1.01) as the reference. At GUA, which is located near the magnetic equator, field line resonance does not occur because of the small vertical component of the ambient magnetic field, so pulsations observed there are likely produced by fast mode waves propagating from sources external to the magnetosphere. We found that the D ‐component Pc 3's in the prenoon sector 0900–1200 LT at L = 1.2–5.5 show a coherent, in‐phase (out‐of‐phase) oscillation in the northern (southern) hemisphere with respect to the H component Pc 3's at GUA. This result indicates that the D ‐component Pc 3's in the prenoon sector at L = 1.2–5.5 are closely related to the upstream source waves.