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Directivity and apparent velocity of the coseismic ionospheric disturbances observed with a dense GPS array

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Title: Directivity and apparent velocity of the coseismic ionospheric disturbances observed with a dense GPS array
Authors: Heki, Kosuke Browse this author →KAKEN DB
Ping, Jinsong Browse this author
Keywords: ionospheric disturbance
Issue Date: 15-Aug-2005
Publisher: Elsevier B.V.
Journal Title: Earth and Planetary Science Letters
Volume: 236
Issue: 3-4
Start Page: 845
End Page: 855
Publisher DOI: 10.1016/j.epsl.2005.06.010
Abstract: Coseismic disturbances in ionosphere have been observed after recent thrust earthquakes off the Pacific coast of Japan, with a dense Global Positioning System array. Positive pulses in electron content, as large as several times 1015 electrons/m2 and as long as 4–5 min, emerge 10 min after earthquakes and propagate horizontally with apparent velocity of 1 km/s, close to the sound velocity at the ionospheric height. They may have been excited by coseismic uplifts of the sea surface initially as upward propagating compressive pulses of atmosphere, which were gradually refracted to propagate horizontally in ionosphere. The propagation has strong north–south asymmetry, and interaction between the movements of charged particles in acoustic waves and geomagnetic fields might have selectively attenuated the northward propagating disturbances.
Type: article (author version)
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 日置 幸介

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