Simultaneous satellite and all-sky imager observations of polar cap phenomena

T. Obara, T. Mukai, H. Hayakawa, A. Matsuoka, K. Tsuruda, A. Nishida, K. Fukui, J. V. Rodriguez, C. E. Valladares

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


In order to understand the processes of formation and motion of sun-aligned polar cap arcs as well as patches, we have analyzed simultaneous observational data from Akebono (EXOS D) satellite and the all-sky imager at Qaanaaq, Greenland. The results demonstrate the correspondence between the localized electron precipitation signatures observed from Akebono and the sun-aligned arcs seen from the all-sky imager at Qaanaaq, and confirm that sun-aligned arc correspond to divE<O. The average energy of precipitating electrons is in the range from 100eV to 200eV. The magnetosheath/mantle is likely the source region of the precipitating electrons. For patches, most drifted anti-sunward, but some ceased to drift within the field of view of the all-sky imager. Comparison between patch movement and the plasma convection velocity demonstrates a general consistency between them.

Original languageEnglish
Pages (from-to)1337-1340
Number of pages4
JournalAdvances in Space Research
Issue number9
Publication statusPublished - 1998
Externally publishedYes

ASJC Scopus subject areas

  • Aerospace Engineering
  • Astronomy and Astrophysics
  • Geophysics
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences(all)


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