Geomagnetic pulsations caused by the Sumatra earthquake on December 26, 2004

Toshihiko Iyemori; Masahito Nose; Desheng Han; Yufen Gao; Michio Hashizume; Nithiwatthn Choosakul; Hiroyuki Shinagawa; Yoshikazu Tanaka; Mitsuru Utsugi; Akinori Saito; Heather McCreadie; Yoko Odagi; Fuxi Yang

doi:10.1029/2005GL024083

Geomagnetic pulsations caused by the Sumatra earthquake on December 26, 2004

Toshihiko Iyemori, Masahito Nose, Desheng Han, Yufen Gao, Michio Hashizume, Nithiwatthn Choosakul, Hiroyuki Shinagawa, Yoshikazu Tanaka, Mitsuru Utsugi, Akinori Saito, Heather McCreadie, Yoko Odagi, Fuxi Yang

Department of Physics

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Abstract

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 magnetosonic wave generated from the electric and magnetic fields of the dynamo current caused by the Earthquake.

Original language	English
Article number	20807
Number of pages	4
Journal	Geophysical Research Letters
Volume	32
Issue number	20
DOIs	https://doi.org/10.1029/2005GL024083
Publication status	Published - 21 Oct 2005

Keywords

ATMOSPHERE
WAVES

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title = "Geomagnetic pulsations caused by the Sumatra earthquake on December 26, 2004",

abstract = "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 magnetosonic wave generated from the electric and magnetic fields of the dynamo current caused by the Earthquake.",

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T1 - Geomagnetic pulsations caused by the Sumatra earthquake on December 26, 2004

AU - Iyemori, Toshihiko

AU - Nose, Masahito

AU - Han, Desheng

AU - Gao, Yufen

AU - Hashizume, Michio

AU - Choosakul, Nithiwatthn

AU - Shinagawa, Hiroyuki

AU - Tanaka, Yoshikazu

AU - Utsugi, Mitsuru

AU - Saito, Akinori

AU - McCreadie, Heather

AU - Odagi, Yoko

AU - Yang, Fuxi

PY - 2005/10/21

Y1 - 2005/10/21

N2 - 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 magnetosonic wave generated from the electric and magnetic fields of the dynamo current caused by the Earthquake.

AB - 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 magnetosonic wave generated from the electric and magnetic fields of the dynamo current caused by the Earthquake.

KW - ATMOSPHERE

KW - WAVES

U2 - 10.1029/2005GL024083

DO - 10.1029/2005GL024083

M3 - Article

SN - 0094-8276

VL - 32

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 20

M1 - 20807

ER -

Geomagnetic pulsations caused by the Sumatra earthquake on December 26, 2004

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Keywords

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