Combined ESR and EISCAT observations of the dayside polar cap and auroral oval during the May 15, 1997 storm

H. Liu, K. Schlegel, S. Y. Ma

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The high-latitude ionospheric response to a major magnetic storm on May 15, 1997 is studied and different responses in the polar cap and the auroral oval are highlighted. Depletion of the F2 region electron density occurred in both the polar cap and the auroral zone, but due to different physical processes. The increased recombination rate of O+ ions caused by a strong electric field played a crucial role in the auroral zone. The transport effect, however, especially the strong upward ion flow was also of great importance in the dayside polar cap. During the main phase and the beginning of the recovery phase soft particle precipitation in the polar cap showed a clear relation to the dynamic pressure of the solar wind, with a maximum cross-correlation coefficient of 0.63 at a time lag of 5 min.

Original languageEnglish
Pages (from-to)1067-1072
Number of pages6
JournalAnnales Geophysicae
Volume18
Issue number9
DOIs
Publication statusPublished - Sep 2000

Fingerprint

polar caps
electron spin resonance
auroral zones
ion
electron density
recombination
electric field
solar wind
particle precipitation
dynamic pressure
magnetic storms
correlation coefficients
polar regions
cross correlation
ionospherics
ions
depletion
time lag
recovery
electric fields

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Geology
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

Combined ESR and EISCAT observations of the dayside polar cap and auroral oval during the May 15, 1997 storm. / Liu, H.; Schlegel, K.; Ma, S. Y.

In: Annales Geophysicae, Vol. 18, No. 9, 09.2000, p. 1067-1072.

Research output: Contribution to journalArticle

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