An investigation of scattering mechanisms and dynamics in PMSE using coherent radar imaging

Details An investigation of scattering mechanisms and dynamics in PMSE using coherent radar imaging An investigation of scattering mechanisms and dynamics in PMSE using coherent radar imaging

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jastp..63.1797y&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 63, Issue 17, p. 1797-1810.

Physics

7

Scientific paper

In this work, coherent radar imaging (CRI) was implemented using the ESrange RADar (ESRAD) system in Kiruna, Sweden (/67.88°N, /21.10°E) in the summer of 1998. For the first time, horizontal structures of polar mesosphere summer echoes (PMSE) are studied with high temporal and angular resolution using CRI. Frequency jumps, which represent sudden changes in radial velocity, were observed in several regions during this experiment. Spectrograms and the horizontal structures of PMSE provided by CRI during two cases of frequency jumps, suggest that the frequency jumps were caused by reflecting points originating from a horizontally stratified layer which was modulated by a wave. It was further verified using simulated data and shown that the vertical amplitude of the wave must have exceeded a particular threshold for a given transmit beamwidth. The horizontal wavelength and phase velocity of the proposed wave were estimated to be in the order of 25-34km and 50-70ms-1, respectively. Additionally, the vertical amplitude of this wave was up to 400m, covering several range gates. A hypothesis of phase synchronized multiple layers perturbed by waves is proposed to explain the presence of the frequency jumps at several altitudes simultaneously.

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