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Ionospheric density oscillations associated with recurrent prompt penetration electric fields during the space weather event of 04 November 2021 over the East-Asian sector
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  • Ram Singh,
  • Young-Sook Lee,
  • Seok-Min Song,
  • Yong Ha Kim,
  • Jong-Yeon Yun,
  • S Sripathi,
  • Rajesh Kumar Barad
Ram Singh
Chungnam National University Daejeon, Chungnam National University Daejeon
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Young-Sook Lee
Chungnam National University, Chungnam National University

Corresponding Author:[email protected]

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Seok-Min Song
Chungnam National University, Chungnam National University
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Yong Ha Kim
Chungnam National University, Chungnam National University
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Jong-Yeon Yun
Korea Space Weather Center (KSWC), Korea Space Weather Center (KSWC)
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S Sripathi
Indian Institute of Geomagnetism, Indian Institute of Geomagnetism
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Rajesh Kumar Barad
Indian Institute of Geomagnetism, Indian Institute of Geomagnetism
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Abstract

We found the signatures of the multiple prompt penetration electric fields (PPEF) and the disturbance dynamo (DD) electric field having impacts on the East Asian sector ionosphere along the meridional chain thoroughly from the equator, low-mid to high latitudes during the space weather event of 03-05 November 2021. The observation is made on GPS-TEC, digisonde, and magnetometer stations. In the main phase of the storm, intense modulations of VTEC (vertical total electron content) and foF2 (critical frequency) are observed as coherently fluctuating with IEF (interplanetary electric field) and IMF Bz reorientations. It is diagnosed that the oscillations in the DP2 (disturbance polar current 2) current system directly penetrate meridianally from high to equatorial latitudes, leading to the significant changes in ionospheric electrodynamics that governs the density fluctuations. The wavelet spectra of VTEC, foF2, h’F (virtual height), H-components and IEF give a result of common and dominant periodicity occurring at ~1hr. This result suggests that the wavelike oscillations of VTEC and foF2 and H component are associated with PP electric fields.