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Ann. Geophys., 14, 1454-1461, 1996
www.ann-geophys.net/14/1454/1996/
© European Geosciences Union 1996
Radar observations of ionospheric irregularities at Syowa Station, Antarctica: a brief overview
T. Ogawa
Solar-Terrestrial Environment Laboratory, Nagoya University, 3-13 Honohara, Toyokawa, Aichi 442, Japanl
Abstract. We briefly overview the radar observations
that have been made for 30 years at Syowa Station, Antarctica for studying
small-scale electron-density irregularities in the southern high-latitude E-
and F-region ionosphere. Some observational results (i.e., long-term
variations of radio aurora, Doppler spectra with narrow spectral widths and low
Doppler velocities, and simultaneous observations of radar and optical auroras)
from VHF radars capable of detecting 1.3- to 3-m scale irregularities are
presented. A new 50-MHz radar system equipped with phased-antenna arrays began
operation in February 1995 to observe two-dimensional behaviours of E-region
irregularities. An HF radar experiment also began in February 1995 to explore
decameter-scale E- and F-region irregularities in the auroral zone
and polar cap. These two radars will contribute to a better understanding of the
ionospheric irregularities and ionospheric physics at southern high latitudes.
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