Characteristics of polar cap aurora

M. Ayukawa, K. Makita, H. Yamagishi, M. Ejiri, T. Sakanoi

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The characteristics of extremely high-latitude dayside auroras are examined by using auroral TV data obtained at Godhavn, Greenland, and simultaneous DMSP particle data. Two different kinds of aurora are found near the pre-noon sector, namely (1) the polar arc: this aurora is observed during quiet periods and originates from the dayside region. It is related to about 100 eV electron precipitation or less, and (2) the polar corona: this aurora is observed during disturbed periods and the appearance latitute of this aurora is confined within a certain region about 70-80° MLAT. It is related to a few hundred eV electrons. These results suggest that the origin of the polar arc seems to be the plasma mantle or low-latitude boundary layer, and the origin of the polar corona seems to be the low-latitude boundary layer or Boundary Plasma Sheet.

Original languageEnglish
Pages (from-to)1885-1894
Number of pages10
JournalJournal of Atmospheric and Terrestrial Physics
Issue number16
Publication statusPublished - 1996 Jan 1

ASJC Scopus subject areas

  • Environmental Science(all)
  • Geophysics
  • Engineering(all)
  • Atmospheric Science
  • Earth and Planetary Sciences(all)


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