Suppression of ionospheric scintillation during St. Patrick's Day geomagnetic super storm as observed over the anomaly crest region station Pingtung, Taiwan: A case study

Chinmaya Nayak, L. C. Tsai, S. Y. Su, I. A. Galkin, R. G. Caton, K. M. Groves

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

In this paper, we investigate the reasons behind the absence of ionospheric VHF scintillation over Pingtung, Taiwan during the March 17, 2015 St. Patrick's Day geomagnetic storm. What makes it more interesting is the fact that the absence of scintillation on the storm day was preceded by observations of scintillation for 6 consecutive days before the storm. A combination of data from VHF receivers, ionosonde and in situ plasma density observations from European Space Agency (ESA)’s SWARM constellation were used for this purpose. Also, global hmF2 maps obtained from International Reference Ionosphere (IRI) Real-Time Assimilative Mapping (IRTAM) were utilised for a better picture of the ionospheric conditions. The main driver behind the absence of the scintillation in the Taiwanese sector was a reduced pre-reversal enhancement (PRE) electric field caused due to westward prompt-penetration electric field (PPEF). This caused the post-sunset ionosphere to drift downwards in altitude causing unfavourable conditions for Rayleigh-Taylor instability. On the contrary, the PPEFs were found to strongly enhance the PRE electric fields in the Indian sector leading to ionospheric irregularities/scintillations in the post-sunset sector.

Original languageEnglish
Pages (from-to)396-405
Number of pages10
JournalAdvances in Space Research
Volume60
Issue number2
DOIs
StatePublished - 15 Jul 2017

Keywords

  • Equatorial ionosphere
  • Ionospheric scintillation
  • St. Patrick's Day storm

Fingerprint

Dive into the research topics of 'Suppression of ionospheric scintillation during St. Patrick's Day geomagnetic super storm as observed over the anomaly crest region station Pingtung, Taiwan: A case study'. Together they form a unique fingerprint.

Cite this