AKR modulation and global Pi2 oscillation

Teiji Uozumi, K. Yumoto, T. Tokunaga, S. I. Solovyev, B. M. Shevtsov, R. Marshall, K. Liou, S. Ohtani, S. Abe, A. Ikeda, K. Kitamura, Akimasa Yoshikawa, Hideaki Kawano, M. Itonaga

Research output: Contribution to journalArticle

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Abstract

In this report we present a temporal relationship between ground Pi2 and auroral kilometric radiation (AKR). We analyzed six isolated substorm events, which were observed by the MAGDAS/CPMN ground magnetometer network and the plasma wave instrument onboard the Polar satellite. We found that the time derivative of the height-integrated AKR power and the ground Pi2 D component had the same periodicity and that the two were synchronized with each other. When the D component fluctuated with the same (opposite) polarity as the magnetic bay variation, the AKR power tended to increase (decrease) during the corresponding interval. An isolated substorm event (AE ∼ 40 nT), which occurred around 10:19 UT on 24 January1997, was selected for a detailed study. The behavior of the Pi2 event can be interpreted by the substorm current wedge (SCW) and Pi2 propagation models. It is confirmed that the midlatitude and high-latitude D component oscillations can be treated as a proxy of the SCW oscillations, whereas the H component oscillations exhibited some phase shifts by the propagation delay of the Pi2 waves. That is, the temporal relation between the time derivative of the AKR power and the ground Pi2 suggests that the height-integrated AKR power was modulated coherently with the SCW oscillations.

Original languageEnglish
Article numberA06214
JournalJournal of Geophysical Research: Space Physics
Volume116
Issue number6
DOIs
Publication statusPublished - Jan 1 2011

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oscillation
Modulation
modulation
Radiation
oscillations
wedges
radiation
Derivatives
Plasma waves
periodicity
propagation
temperate regions
Magnetometers
plasma waves
magnetometer
Phase shift
polar regions
magnetometers
Wave propagation
periodic variations

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences (miscellaneous)
  • Palaeontology

Cite this

Uozumi, T., Yumoto, K., Tokunaga, T., Solovyev, S. I., Shevtsov, B. M., Marshall, R., ... Itonaga, M. (2011). AKR modulation and global Pi2 oscillation. Journal of Geophysical Research: Space Physics, 116(6), [A06214]. https://doi.org/10.1029/2010JA016042

AKR modulation and global Pi2 oscillation. / Uozumi, Teiji; Yumoto, K.; Tokunaga, T.; Solovyev, S. I.; Shevtsov, B. M.; Marshall, R.; Liou, K.; Ohtani, S.; Abe, S.; Ikeda, A.; Kitamura, K.; Yoshikawa, Akimasa; Kawano, Hideaki; Itonaga, M.

In: Journal of Geophysical Research: Space Physics, Vol. 116, No. 6, A06214, 01.01.2011.

Research output: Contribution to journalArticle

Uozumi, T, Yumoto, K, Tokunaga, T, Solovyev, SI, Shevtsov, BM, Marshall, R, Liou, K, Ohtani, S, Abe, S, Ikeda, A, Kitamura, K, Yoshikawa, A, Kawano, H & Itonaga, M 2011, 'AKR modulation and global Pi2 oscillation', Journal of Geophysical Research: Space Physics, vol. 116, no. 6, A06214. https://doi.org/10.1029/2010JA016042
Uozumi T, Yumoto K, Tokunaga T, Solovyev SI, Shevtsov BM, Marshall R et al. AKR modulation and global Pi2 oscillation. Journal of Geophysical Research: Space Physics. 2011 Jan 1;116(6). A06214. https://doi.org/10.1029/2010JA016042
Uozumi, Teiji ; Yumoto, K. ; Tokunaga, T. ; Solovyev, S. I. ; Shevtsov, B. M. ; Marshall, R. ; Liou, K. ; Ohtani, S. ; Abe, S. ; Ikeda, A. ; Kitamura, K. ; Yoshikawa, Akimasa ; Kawano, Hideaki ; Itonaga, M. / AKR modulation and global Pi2 oscillation. In: Journal of Geophysical Research: Space Physics. 2011 ; Vol. 116, No. 6.
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