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| Titel |
Spectral characteristics and scatter cross-section of low latitude mesospheric echoes measured by the Indian MST radar at Gadanki |
| VerfasserIn |
E. Belova, S. Kirkwood  , T. Narayana Rao, S. Satheesh Kumar, T. Sergienko |
| 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 ; 30, no. 6 ; Nr. 30, no. 6 (2012-06-27), S.983-990 |
| Datensatznummer |
250017237
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| Publikation (Nr.) |
 copernicus.org/angeo-30-983-2012.pdf |
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| Zusammenfassung |
| In November 2008 and in March and April 2009 the Indian MST radar (53 MHz) at
Gadanki was operated during the daytime in a special experiment, with 600 m
altitude resolution, for understanding the characteristics of low-latitude
mesospheric echoes (LLME). The data of three days when the echoes were
strongest have been analysed in terms of spectral widths and radar volume
reflectivities. Spectral widths of LLME show some decrease with altitude,
with median values of 4–6 m s−1 at 69–72 km and of 2–4 m s−1 at 73–78 km. This
corresponds to 20–200 mW kg−1 turbulent energy dissipation rates. It has been
shown that stronger echoes have broader spectra consistent with a turbulent
scattering mechanism. For the first time, the volume reflectivities for the
strong LLME for Gadanki have also been calculated. They are in the range of
10−17–10−15 m−1, so LLME at Gadanki are somewhat stronger than
those reported so far from Jicamarca, Peru (Lehmacher et al., 2009). |
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