Spectral characteristics and scatter cross-section of low latitude mesospheric echoes measured by the Indian MST radar at Gadanki
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 we...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2012-06-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/30/983/2012/angeo-30-983-2012.pdf |
| _version_ | 1817995688312569856 |
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| author | E. Belova S. Kirkwood T. Narayana Rao S. Satheesh Kumar T. Sergienko |
| author_facet | E. Belova S. Kirkwood T. Narayana Rao S. Satheesh Kumar T. Sergienko |
| author_sort | E. Belova |
| collection | DOAJ |
| description | 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<sup>−1</sup> at 69–72 km and of 2–4 m s<sup>−1</sup> at 73–78 km. This
corresponds to 20–200 mW kg<sup>−1</sup> 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<sup>−17</sup>–10<sup>−15</sup> m<sup>−1</sup>, so LLME at Gadanki are somewhat stronger than
those reported so far from Jicamarca, Peru (Lehmacher et al., 2009). |
| first_indexed | 2024-04-14T02:09:46Z |
| format | Article |
| id | doaj.art-e84acc95ccc246119dbf8428abe3e338 |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-04-14T02:09:46Z |
| publishDate | 2012-06-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-e84acc95ccc246119dbf8428abe3e3382022-12-22T02:18:28ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762012-06-013098399010.5194/angeo-30-983-2012Spectral characteristics and scatter cross-section of low latitude mesospheric echoes measured by the Indian MST radar at GadankiE. Belova0S. Kirkwood1T. Narayana Rao2S. Satheesh Kumar3T. Sergienko4Swedish Institute of Space Physics, Kiruna, SwedenSwedish Institute of Space Physics, Kiruna, SwedenNational Atmospheric Research Laboratory, Gadanki, IndiaNational Atmospheric Research Laboratory, Gadanki, IndiaSwedish Institute of Space Physics, Kiruna, SwedenIn 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<sup>−1</sup> at 69–72 km and of 2–4 m s<sup>−1</sup> at 73–78 km. This corresponds to 20–200 mW kg<sup>−1</sup> 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<sup>−17</sup>–10<sup>−15</sup> m<sup>−1</sup>, so LLME at Gadanki are somewhat stronger than those reported so far from Jicamarca, Peru (Lehmacher et al., 2009).https://www.ann-geophys.net/30/983/2012/angeo-30-983-2012.pdf |
| spellingShingle | E. Belova S. Kirkwood T. Narayana Rao S. Satheesh Kumar T. Sergienko Spectral characteristics and scatter cross-section of low latitude mesospheric echoes measured by the Indian MST radar at Gadanki Annales Geophysicae |
| title | Spectral characteristics and scatter cross-section of low latitude mesospheric echoes measured by the Indian MST radar at Gadanki |
| title_full | Spectral characteristics and scatter cross-section of low latitude mesospheric echoes measured by the Indian MST radar at Gadanki |
| title_fullStr | Spectral characteristics and scatter cross-section of low latitude mesospheric echoes measured by the Indian MST radar at Gadanki |
| title_full_unstemmed | Spectral characteristics and scatter cross-section of low latitude mesospheric echoes measured by the Indian MST radar at Gadanki |
| title_short | Spectral characteristics and scatter cross-section of low latitude mesospheric echoes measured by the Indian MST radar at Gadanki |
| title_sort | spectral characteristics and scatter cross section of low latitude mesospheric echoes measured by the indian mst radar at gadanki |
| url | https://www.ann-geophys.net/30/983/2012/angeo-30-983-2012.pdf |
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