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Ann. Geophys., 22, 3137-3143, 2004
www.ann-geophys.net/22/3137/2004/
© European Geosciences Union 2004
Time evolution of high-altitude plasma bubbles imaged at geomagnetic conjugate points
K. Shiokawa1, Y. Otsuka1, T. Ogawa1, and P. Wilkinson2
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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