Characterization of ionospheric irregularities over Vietnam and adjacent region for the 2008-2018 period

Dung  Nguyen Thanh; Minh Le Huy; Christine  Amory-Mazaudier; Rolland  Fleury; Susumu  Saito; Thang Nguyen Chien; Hong  Pham Thi Thu; Thanh Le Truong; Mai Nguyen Thi

doi:10.15625/2615-9783/16502

Author affiliations

Authors

Dung Nguyen Thanh 1-Institute of Geophysics, VAST, Hanoi, Vietnam; 2-Graduate University of Science and Technology, VAST, Hanoi, Vietnam
Minh Le Huy 1-Institute of Geophysics, VAST, Hanoi, Vietnam; 2-Graduate University of Science and Technology, VAST, Hanoi, Vietnam
Christine Amory-Mazaudier 1-Sorbonne Universités, UPMC Univ. Paris 06, UMR 7648, Laboratoire de Physique des Plasmas, F-75005, Paris, France; 2-T/ICT4D, ICTP, International Centre for Theoretical Physics, StradaCostiera, 11, I-34151 Trieste Italy
Rolland Fleury LAB-STICC, UMR 6285, Institut Mines-Telecom Atlantique, CS 83818, 29288 Brest Cédex 3, France
Susumu Saito Electronic Navigation Research Institute, National Institute of Maritime, Port and Aviation Technology, 7-42-23 Jindaiji-Higashi, Chofu, Tokyo 182-0012, Japan
Thang Nguyen Chien Institute of Geophysics, VAST, Hanoi, Vietnam
Hong Pham Thi Thu 1-Institute of Geophysics, VAST, Hanoi, Vietnam; 2-Graduate University of Science and Technology, VAST, Hanoi, Vietnam
Thanh Le Truong Institute of Geophysics, VAST, Hanoi, Vietnam
Mai Nguyen Thi Institute of Geophysics, VAST, Hanoi, Vietnam

DOI:

https://doi.org/10.15625/2615-9783/16502

Keywords:

GPS continuous data, TEC, ROTI, ionospheric irregularities, Southeast Asian region

Abstract

This paper presents the variations of the rate of change of Total Electron Content (TEC) index (ROTI), characterizing the occurrence of ionospheric plasma irregularities over Vietnam and neighboring countries in the Southeast Asian region using the continuous GPS data during the 2008-2018 period. The results showed that the occurrence of strong ROTI in all stations is maximum in equinox months March/April and September/October and depends on solar activity. The ROTI is weak during periods of low solar activity and strong during periods of high solar activity. There is an asymmetry between the two equinoxes. During maximum and declining phases of 2014-2016, occurrence rates in March equinox are larger than in September equinox, but during the descending period of 2010-2011, the occurrence rates in September equinox at almost all stations are larger than in March equinox. The correlation coefficients between the monthly occurrence rate of irregularities and the F10.7 solar index at the stations in the equatorward EIA crest region are higher than at those in the magnetic equatorial and the poleward EIA crest regions. The irregularity occurrence is high in the pre-midnight sector, maximum between 2000 LT to 2200 LT. The maximum irregularity occurrence is located around 4-5° degrees in latitude equator-ward away from the anomaly crests.

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