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| Titel |
Letter to the Editor: Complete maps of the aspect sensitivity of VHF atmospheric radar echoes |
| VerfasserIn |
R. M. Worthington, R. D. Palmer, S. Fukao |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 17, no. 8 ; Nr. 17, no. 8, S.1116-1119 |
| Datensatznummer |
250013804
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| Publikation (Nr.) |
 copernicus.org/angeo-17-1116-1999.pdf |
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| Zusammenfassung |
Using the MU radar at Shigaraki, Japan
(34.85°N, 136.10°E), we measure the power distribution pattern of VHF radar
echoes from the mid-troposphere. The large number of radar beam-pointing
directions (320) allows the mapping of echo power from 0° to 40° from zenith,
and also the dependence on azimuth, which has not been achieved before at VHF
wavelengths. The results show how vertical shear of the horizontal wind is
associated with a definite skewing of the VHF echo power distribution, for beam
angles as far as 30° or more from zenith, so that aspect sensitivity cannot be
assumed negligible at any beam-pointing angle that most existing VHF radars are
able to use. Consequently, the use of VHF echo power to calculate intensity of
atmospheric turbulence, which assumes only isotropic backscatter at large beam
zenith angles, will sometimes not be valid.
Key words. Meteorology and atmospheric dynamics (middle
atmosphere dynamics; turbulence; instruments and techniques) |
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