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Geomagnetic pulsations caused by the Sumatra earthquake on December 26, 2004
Author(s) -
Iyemori Toshihiko,
Nose Masahito,
Han Desheng,
Gao Yufen,
Hashizume Michio,
Choosakul Nithiwatthn,
Shinagawa Hiroyuki,
Tanaka Yoshikazu,
Utsugi Mitsuru,
Saito Akinori,
McCreadie Heather,
Odagi Yoko,
Yang Fuxi
Publication year - 2005
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 - 10.1029/2005gl024083
Subject(s) - dynamo , geology , earth's magnetic field , seismology , geophysics , period (music) , magnetic field , ionosphere , dynamo theory , geodesy , physics , quantum mechanics , acoustics
A long period Pc5 pulsation was observed at Phimai in Thailand, shortly after the origin time of the Sumatra earthquake on December 26, 2004. The localized nature and the period of oscillations suggest that the long period magnetic pulsation was generated by dynamo action in the lower ionosphere, set up by an atmospheric pressure pulse which propagated vertically as an acoustic wave when the ocean floor suddenly moved vertically. It is speculated that a Pc3 type pulsation observed at Tong Hai in China, 10 degrees north of Phimai in latitude, was the result of magnetic field line resonance with a magneto‐sonic wave generated from the electric and magnetic fields of the dynamo current caused by the Earthquake.