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Low Latitude Ionospheric TEC Oscillations Associated With Periodic Changes in IMF Bz Polarity
Author(s) -
Li Guozhu,
Ning Baiqi,
Zhao Xiukuan,
Sun Wenjie,
Hu Lianhuan,
Xie Haiyong,
Liu Kangkang,
Ajith K. K.
Publication year - 2019
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2019gl084428
Subject(s) - tec , ionosphere , total electron content , geology , longitude , earth's magnetic field , ionosonde , geophysics , latitude , geodesy , equatorial electrojet , atmospheric sciences , physics , plasma , magnetic field , electron density , quantum mechanics
An Ionospheric Observation Network for Irregularity and Scintillation in East/Southeast Asia was recently deployed. Using ionospheric total electron content (TEC) from the two crossed Beidou geostationary satellite receiver chains of the network along 110°E and 23°N and Doppler velocity measurements from the Sanya (18.3°N, 109.6°E) portable digital ionosonde, we report first observations of low latitude TEC oscillations synchronized over a wide longitude range in East/Southeast Asia, which occur at nighttime, after the main phase of the geomagnetic storm on 20 April 2018. A comparison among TEC and Doppler velocity and interplanetary magnetic field (IMF) Bz component shows that the periodic TEC enhancements correlate with F region downward plasma drifts and IMF Bz southward turnings. The results suggest that the quasiperiodic southward turnings of IMF Bz could produce multiple short‐lived westward prompt penetration electric fields, which contribute to driving the nighttime low latitude TEC oscillations simultaneously over the wide longitude range.