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Low Latitude Ionospheric TEC Oscillations Associated With Periodic Changes in IMF Bz Polarity

Li, Guozhu ; Ning, Baiqi ; Zhao, Xiukuan ; Sun, Wenjie ; Hu, Lianhuan ; Xie, Haiyong ; Liu, Kangkang ; Ajith, K. K.

Geophysical research letters, 2019-08, Vol.46 (16), p.9379-9387 [Periódico revisado por pares]

Washington: John Wiley & Sons, Inc

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  • Título:
    Low Latitude Ionospheric TEC Oscillations Associated With Periodic Changes in IMF Bz Polarity
  • Autor: Li, Guozhu ; Ning, Baiqi ; Zhao, Xiukuan ; Sun, Wenjie ; Hu, Lianhuan ; Xie, Haiyong ; Liu, Kangkang ; Ajith, K. K.
  • Assuntos: Doppler sonar ; Drift ; Electric field ; Electric fields ; Equatorial ionization anomaly ; F region ; geomagnetic storm ; Geomagnetic storms ; Geomagnetism ; Global positioning systems ; GPS ; Interplanetary magnetic field ; Ionization ; Ionosondes ; Ionosphere ; Ionospheric electron content ; Ionospheric storms ; Irregularities ; Latitude ; Longitude ; low latitude ionosphere ; Magnetic field ; Magnetic fields ; Magnetic storms ; Night ; Night-time ; Nighttime ; Oscillations ; Penetration ; Plasma ; Plasma drift ; plasma refilling ; Polarity ; Pressure ; Recombination ; Satellite navigation systems ; Satellite observation ; Satellites ; Scintillation ; Storm effects ; Storms ; Synchronous satellites ; TEC oscillation ; Total Electron Content ; Velocity ; Vertical drift
  • É parte de: Geophysical research letters, 2019-08, Vol.46 (16), p.9379-9387
  • Descrição: 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. Plain Language Summary Regional‐scale positive/negative ionospheric storm effects have been widely investigated using GPS total electron content (TEC) and ionosonde observations. Here we report significant nighttime TEC oscillations detected at latitudes lower than the equatorial ionization anomaly crest in the longitudes of 95–120°E by the Ionospheric Observation Network for Irregularity and Scintillation in East/Southeast Asia during geomagnetic storm. Periodic TEC enhancements are nearly synchronized over the wide longitude range, in close association with downward plasma drifts at low latitude. The good consistence between the changes of plasma vertical drift and of interplanetary magnetic field Bz polarity indicates that multiple short‐lived westward prompt penetration electric fields could drive the periodic downward plasma drifts, which are very likely to cause low‐pressure region of topside ionosphere at low latitude and subsequent flowing of plasma from higher latitudes (equatorial ionization anomaly crest) to the low‐pressure region. The extra plasma sourced from higher latitudes, which is against the loss of increased recombination due to F region height decrease, could contribute to the TEC oscillations. Compared with the TEC measurements by GPS receiver network that are affected by satellite motion, the Ionospheric Observation Network for Irregularity and Scintillation in East/Southeast Asia, which measures TEC at fixed ionospheric pierce points along the same longitude/latitude by receiving Beidou geostationary satellite signals, provides a unique means for fine‐scale observations of ionospheric perturbations not previously possible. Key Points We report first IONISE observations of low latitude TEC oscillations synchronized over a wide longitude range at nighttime The TEC oscillations were likely driven by multiple westward PPEFs due to southward turnings of IMF Bz The IONISE provides a unique means for fine‐scale observations of ionospheric perturbations along the same longitude/latitude
  • Editor: Washington: John Wiley & Sons, Inc
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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