Computer Science – Sound
Scientific paper
Jul 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979kyome..41..220a&link_type=abstract
Kyoto University, Faculty of Engineering, Memoirs, vol. 41, July 1979, p. 220-239.
Computer Science
Sound
Atmospheric Tides, Ionospheric Sounding, Meteorological Radar, Radar Measurement, Wind Velocity Measurement, Coherent Radar, Diurnal Variations, Doppler Radar, Japan, Power Spectra, Radar Echoes, Spectrum Analysis
Scientific paper
The results of meteor radar observations which have been carried out at Kyoto University since December, 1977 are described. The radar is a coherent pulse Doppler radar with a transmitting frequency of 31.57 MHz and a nominal peak power of 10 kW, able to detect wind fields at meteor regions of 80-110 km. The solar semidiurnal tide generally dominates the wind oscillations at these heights, while a diurnal tide of comparable magnitude is revealed in a less regular manner. Some anomalies in the amplitude and phase characteristics of the tides are shown, which might be related to a possible interaction with winds and waves, or to some disturbed conditions in the earth's atmosphere. Planetary scale waves such as quasi-2-day oscillations and resonantly magnified gravity-mode waves have also been found there. Hence, the meteor radar, together with other observations, will help clarify the dynamical process of atmospheric waves on a global scale.
Aso Takehiko
Ito Ryosuke
Karasawa Y.
Kato Shoji
Matsuda Satoshi
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