Two components of ionospheric plasma structuring at midlatitudes observed during the large magnetic storm of October 30, 2003

Su Basu, S. Basu, J. J. Makela, R. E. Sheehan, Eileen MacKenzie, P. Doherty, J. W. Wright, M. J. Keskinen, D. Pallamraju, Larry J. Paxton, F. T. Berkey

Research output: Contribution to journalArticlepeer-review

Abstract

We consider VHF amplitude scintillations, GPS phase fluctuations, ionosonde measurements, maps of GPS total electron content (TEC), observations of daytime aurora and TIMED GUVI images during the large magnetic storms of October 29-31, 2003, and find two distinct classes of plasma processes that produce midlatitude ionospheric irregularities. One is associated with auroral plasma processes; the other, with storm enhanced density (SED) gradients, a part of which occur in close proximity to subauroral polarization stream (SAPS) electric fields as discussed by J. C. Foster et al. (2002). We analyze in detail the storm event of October 30, 2003. The SAPS-associated plasma structures may occur by an ion temperature gradient convective instability (M. J. Keskinen et al., 2004), but structuring by auroral processes requires elucidation.

Original languageEnglish (US)
Pages (from-to)1-4
Number of pages4
JournalGeophysical Research Letters
Volume32
Issue number12
DOIs
StatePublished - Jun 28 2005

ASJC Scopus subject areas

  • Geophysics
  • General Earth and Planetary Sciences

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