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Geodetic Remote Sensing of Ionosphere in Relation to Space Weather and Seismic Activity in B&H

  • Randa NatrasEmail author
  • Medzida Mulic
Conference paper
Part of the International Association of Geodesy Symposia book series (IAG SYMPOSIA, volume 149)

Abstract

Total electron content (TEC), along GNSS signal’s path in the ionosphere, is spatially and temporally highly variable. In addition, sudden disturbances in the ionosphere may occur on the global, regional or local level from external sources, such as space weather and seismic activity. Results of TEC investigation for mid-latitude ionosphere over B&H (Bosnia and Herzegovina) during seismic activity of medium intensity (4 < M < 5 Richter) and severe geomagnetic storm (St. Patrick’s Day in 2015) are presented. Analyses of relevant parameters such as solar wind, interplanetary magnetic field and geomagnetic activity are performed. Different analyses of TEC variations are carried out. Lower and upper bounds (LB and UB) are determined by 15-day running TEC median prior the day of consideration ± 2*standard deviation. TEC values which exceeded LB and UB are marked as anomalies. TECQUIET is calculated as mean TEC for five quietest days in a month regarding geomagnetic conditions to observe TEC residuals due to enhanced geomagnetic activity. Direct comparison of TEC values at different stations is also conducted. TEC deviations were in better agreement concerning GNSS stations located close to the epicentre. Both positive and negative anomalies were registered 2 weeks before the earthquake, with higher deviations during 7 days before, at stations located inside the earthquake preparation zone. The potential causes of these anomalies are discussed. Analysis of TEC response to the strongest geomagnetic storm in solar cycle 24 shows TEC deviations from 50% to even 150% compared to TECQUIET, where “positive ionospheric storm” is observed in the main phase and “negative ionospheric storm” in the recovery phase of the geomagnetic storm.

Keywords

Earthquake Geomagnetic storm Ionosphere Lithosphere-ionosphere coupling Space weather Total electron content (TEC) 

Abbreviations

B&H

Bosnia and Herzegovina

BiHPOS

Bosnia and Herzegovina Positioning Service

CME

Coronal mass ejection

EPN

EUREF Permanent Network

EQ

Earthquake

GNSS

Global Navigation Satellite System

GS

Geomagnetic storm

LB

Lower bound

SC

Solar cycle

SW

Space weather

TEC

Total electron content

TECU

TEC units

UB

Upper bound

VTEC

Vertical total electron content

Notes

Acknowledgements

Authors are sincerely grateful to International Association of Geodesy (IAG) for providing travel grant to the first author to deliver oral presentation at IAG-IASPEI Assembly 2017 in Kobe, Japan. Authors also thank International Center of Theoretical Physics Abdus Salam in Trieste and Dr. Luigi Ciraolo for the TEC calibration programme. Many thanks to institutions and organizations, which kindly provided their data: German Research Centre for Geosciences; NASA OmniWeb; World Data Center for Geomagnetism at Kyoto University Japan; EUREF Permanent Network; Geodetic Administration of Federation Bosnia and Herzegovina.

Authors are grateful to reviewers for their valuable comments and suggestions to improve the quality of the manuscript.

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Copyright information

© Springer Nature Switzerland AG 2018

Authors and Affiliations

  1. 1.Department of Geodesy, Faculty of Civil EngineeringUniversity of SarajevoSarajevoBosnia and Herzegovina

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