TY - JOUR
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 -