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On the Relationship Between Aspect Sensitivity, Wave Activity, Andmultiple Scattering Centers of Mesosphere Summer Echoes: a Case Study Using Coherent Radar Imaging : Volume 22, Issue 3 (19/03/2004)

By Chen, J.-s.

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Book Id: WPLBN0003981896
Format Type: PDF Article :
File Size: Pages 11
Reproduction Date: 2015

Title: On the Relationship Between Aspect Sensitivity, Wave Activity, Andmultiple Scattering Centers of Mesosphere Summer Echoes: a Case Study Using Coherent Radar Imaging : Volume 22, Issue 3 (19/03/2004)  
Author: Chen, J.-s.
Volume: Vol. 22, Issue 3
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2004
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Zecha, M., Hoffmann, P., Chen, J., & Röttger, J. (2004). On the Relationship Between Aspect Sensitivity, Wave Activity, Andmultiple Scattering Centers of Mesosphere Summer Echoes: a Case Study Using Coherent Radar Imaging : Volume 22, Issue 3 (19/03/2004). Retrieved from http://www.netlibrary.net/


Description
Description: Department of Electronic Engineering, Chienkuo Institute of Technology, Changhua 500, Taiwan. A mesosphere-summer-echo layer, observed by the OSWIN VHF radar (54.1°N, 11.8°E) with vertical and 7° oblique radar beams, was examined using the method of coherent radar imaging (CRI). We disclosed the echo events having multiple scattering centers (MSC) in the radar volume by means of the high angular resolution of the CRI technique and found that the MSC events occurred more frequently in the upper portion of the echo layer. More examinations showed that the characteristics were different between the upper and lower portions of the layer. For example, the differences in echo power between vertical and oblique beams changed mostly from positive to negative along the increase of altitude, and strong turbulent echoes were seen in the upper portion of the layer. These observations indicate that the aspect sensitivity of the echoes became less and less with the increase of altitude. Moreover, the scattering centers of the echoes were close to zenith for the lower portion of the layer but were usually several degrees from the zenith for the upper portion of the layer. Observable wave-like variation in the scattering center was also seen in the upper part of the layer. Based on these features, we drew some conclusions for this case study: (a) the MSC events might result from the slanted layer/anisotropic structure tilted by short-wave activities, (b) the tilt angle of the layer structure could be 6°–10°, causing the echo power received by the 7° oblique beam was larger than or comparable to that received by the vertical beam, and (c) short-wave activities not only tilted the layer structure, but also induced isotropic irregularities.

Key words. Meteorology and atmospheric dynamics (middle atmosphere dynamics). Radio science (interferometry; instruments and techniques)


Summary
On the relationship between aspect sensitivity, wave activity, andmultiple scattering centers of mesosphere summer echoes: a case study using coherent radar imaging

 

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