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Investigation of Ionospheric Response to June 2009 Sarychev Peak Volcano Eruption

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Title: Investigation of Ionospheric Response to June 2009 Sarychev Peak Volcano Eruption
Authors: Shestakov, Nikolay Browse this author
Orlyakovskiy, Alexander Browse this author
Perevalova, Natalia Browse this author
Titkov, Nikolay Browse this author
Chebrov, Danila Browse this author
Ohzono, Mako Browse this author
Takahashi, Hiroaki Browse this author →KAKEN DB
Keywords: volcanic eruption
explosion
GNSS ionosphere sounding
covolcanic ionospheric disturbances
Issue Date: Feb-2021
Publisher: MDPI
Journal Title: Remote Sensing
Volume: 13
Issue: 4
Start Page: 638
Publisher DOI: 10.3390/rs13040638
Abstract: Global Navigation Satellite Systems have been extensively used to investigate the ionosphere response to various natural and man-made phenomena for the last three decades. However, ionospheric reaction to volcano eruptions is still insufficiently studied and understood. In this work we analyzed the ionospheric response to the 11-16 June 2009 VEI class 4 Sarychev Peak volcano eruption by using surrounding Russian and Japanese GPS networks. Prominent covolcanictotal electron content (TEC)ionospheric disturbances (CVIDs) with amplitudes and periods ranged between 0.03-0.15 TECU and 2.5-4.5 min were discovered for the three eruptive events occurred at 18:51 UT, 14 June; at 01:15 and 09:18 UT, 15 June 2009. The estimates of apparent CVIDs velocities vary within 700-1000 m/s in the far-field zone (300-900 km to the southwest from the volcano) and 1300-1800 m/s in close proximity toSarychev Peak. The characteristics of the observed TEC variations allow us to attribute them to acoustic mode. The south-southwestward direction is preferred for CVIDs propagation. We concluded that the ionospheric response to a volcano eruption is mainly determined by a ratio between explosion strength and background ionization level. Some evidence of secondary (F2-layer) CVIDs' source eccentric location were obtained.
Rights: http://creativecommons.org/licenses/by/4.0/
Type: article
URI: http://hdl.handle.net/2115/81040
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)

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