Ionospheric and geomagnetic disturbances during the 2005 Sumatran earthquakes

Alina Marie Hasbi, Mohammed Awad Momani, Mohd Alauddin Mohd Ali, Norbahiah Misran, Kazuo Shiokawa, Yuichi Otsuka, Kiyohumi Yumoto

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

This paper investigates the ionospheric and geomagnetic responses during the 28 March 2005 and 14 May 2005 Sumatran earthquakes using GPS and magnetometer stations located in the near zone of the epicenters. These events occurred during low solar and geomagnetic activity. TEC oscillations with periods of 5-10 min were observed about 10-24 min after the earthquakes and have horizontal propagation velocities of 922-1259 m/s. Ionospheric disturbances were observed at GPS stations located to the northeast of the epicenters, while no significant disturbances were seen relatively east and south of the epicenters. The magnetic field measurements show rapid fluctuations of 4-5 s shortly after the earthquake, followed by a Pc5 pulsation of 4.8 min about 11 min after the event. The correlation between the ionospheric and geomagnetic responses shows a good agreement in the period and time lag of the peak disturbance arrival, i.e. about 11-13 min after the earthquake.

Original languageEnglish
Pages (from-to)1992-2005
Number of pages14
JournalJournal of Atmospheric and Solar-Terrestrial Physics
Volume71
Issue number17-18
DOIs
Publication statusPublished - Dec 2009

Fingerprint

ionospheric disturbances
disturbances
earthquakes
earthquake epicenter
disturbance
earthquake
ionospherics
time lag
GPS
stations
propagation velocity
magnetometer
solar activity
magnetometers
arrivals
oscillation
magnetic field
oscillations
magnetic fields
station

Keywords

  • Acoustic and gravity waves
  • Earthquake
  • GPS TEC
  • Magnetic field

ASJC Scopus subject areas

  • Geophysics
  • Space and Planetary Science
  • Atmospheric Science

Cite this

Ionospheric and geomagnetic disturbances during the 2005 Sumatran earthquakes. / Hasbi, Alina Marie; Momani, Mohammed Awad; Mohd Ali, Mohd Alauddin; Misran, Norbahiah; Shiokawa, Kazuo; Otsuka, Yuichi; Yumoto, Kiyohumi.

In: Journal of Atmospheric and Solar-Terrestrial Physics, Vol. 71, No. 17-18, 12.2009, p. 1992-2005.

Research output: Contribution to journalArticle

Hasbi, Alina Marie ; Momani, Mohammed Awad ; Mohd Ali, Mohd Alauddin ; Misran, Norbahiah ; Shiokawa, Kazuo ; Otsuka, Yuichi ; Yumoto, Kiyohumi. / Ionospheric and geomagnetic disturbances during the 2005 Sumatran earthquakes. In: Journal of Atmospheric and Solar-Terrestrial Physics. 2009 ; Vol. 71, No. 17-18. pp. 1992-2005.
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AU - Mohd Ali, Mohd Alauddin

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AU - Shiokawa, Kazuo

AU - Otsuka, Yuichi

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AB - This paper investigates the ionospheric and geomagnetic responses during the 28 March 2005 and 14 May 2005 Sumatran earthquakes using GPS and magnetometer stations located in the near zone of the epicenters. These events occurred during low solar and geomagnetic activity. TEC oscillations with periods of 5-10 min were observed about 10-24 min after the earthquakes and have horizontal propagation velocities of 922-1259 m/s. Ionospheric disturbances were observed at GPS stations located to the northeast of the epicenters, while no significant disturbances were seen relatively east and south of the epicenters. The magnetic field measurements show rapid fluctuations of 4-5 s shortly after the earthquake, followed by a Pc5 pulsation of 4.8 min about 11 min after the event. The correlation between the ionospheric and geomagnetic responses shows a good agreement in the period and time lag of the peak disturbance arrival, i.e. about 11-13 min after the earthquake.

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