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| Titel |
Meteor radar measurements of MLT winds near the equatorial electro jet region over Thumba (8.5° N, 77° E): comparison with TIDI observations |
| VerfasserIn |
S. R. John, Karanam Kishore Kumar, K. V. Subrahmanyam, G. Manju, Q. Wu |
| 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 ; 29, no. 7 ; Nr. 29, no. 7 (2011-07-01), S.1209-1214 |
| Datensatznummer |
250017055
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| Publikation (Nr.) |
 copernicus.org/angeo-29-1209-2011.pdf |
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| Zusammenfassung |
| The All-Sky interferometric meteor (SKYiMET) radar (MR) derived winds in the
vicinity of the equatorial electrojet (EEJ) are discussed. As Thumba
(8.5° N, 77° E; dip lat. 0.5° N) is under the EEJ belt, there
has been some debate on the reliability of the meteor radar derived winds
near the EEJ height region. In this regard, the composite diurnal variations
of zonal wind profiles in the mesosphere-lower thermosphere (MLT) region
derived from TIMED Doppler Interferometer (TIDI) and ground based meteor
radar at Thumba are compared. In this study, emphasis is given to verify the
meteor radar observations at 98 km height region, especially during the EEJ
peaking time (11:00 to 14:00 LT). The composite diurnal cycles of zonal winds
over Thumba are constructed during four seasons of the year 2006 using TIDI
and meteor radar observations, which showed good agreement especially during
the peak EEJ hours, thus assuring the reliability of meteor radar
measurements of neutral winds close to the EEJ height region. It is evident
from the present study that on seasonal scales, the radar measurements are
not biased by the EEJ. The day-time variations of HF radar measured E-region
drifts at the EEJ region are also compared with MR measurements to show
there are large differences between ionospheric drifts and MR measurements.
The significance of the present study lies in validating the meteor radar
technique over Thumba located at magnetic equator by comparing with other
than the radio technique for the first time. |
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