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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 22, issue 9
Ann. Geophys., 22, 3137–3143, 2004
https://doi.org/10.5194/angeo-22-3137-2004
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Equatorial and low latitude aeronomy (ELLA)

Ann. Geophys., 22, 3137–3143, 2004
https://doi.org/10.5194/angeo-22-3137-2004
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 3.0 License.

  23 Sep 2004

23 Sep 2004

Time evolution of high-altitude plasma bubbles imaged at geomagnetic conjugate points

K. Shiokawa1, Y. Otsuka1, T. Ogawa1, and P. Wilkinson2 K. Shiokawa et al.
  • 1Solar-Terrestrial Environment Laboratory, Nagoya University, Toyokawa 442-8507, Japan
  • 2IPS Radio and Space Services, Haymarket, New South Wales 1240, Australia

Abstract. Temporal and spatial evolution of two high-altitude plasma bubbles (evening and midnight) was observed on 4 April 2002, at geomagnetic conjugate points at Sata, Japan (magnetic latitude 24° N), and Darwin, Australia (magnetic latitude 22° S), using two 630-nm airglow imagers. The apex height of the bubbles reached ~1500km. The upward velocity of the evolution was faster in the evening (~170m/s at 20:00-21:00 LT) than around midnight (~28m/s at 23:00-00:00 LT). Bifurcating features of the bubbles into a smaller scale size of ~50km were clearly seen for both the evening and midnight bubbles, showing fairly good conjugacy between the Northern and Southern Hemispheres.

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