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| Titel |
Lower E-region echoes over the magnetic equator as observed by the MF radar at Tirunelveli (8.7° N, 77.8° E) and their relationship to Esq and Esb |
| VerfasserIn |
R. Dhanya, S. Gurubaran, K. Emperumal |
| 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 ; 26, no. 8 ; Nr. 26, no. 8 (2008-08-15), S.2459-2470 |
| Datensatznummer |
250016203
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| Publikation (Nr.) |
 copernicus.org/angeo-26-2459-2008.pdf |
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| Zusammenfassung |
| The spaced antenna medium frequency (MF) radar at Tirunelveli (8.7° N,
77.8° E, geographic; 1.7° N, magnetic dip), the only one of its kind
currently operating close to the magnetic equator, has provided an
opportunity to investigate the electrodynamical processes related to the
equatorial electrojet (EEJ) and their influence on the radar scatterers at
medium frequencies in the lower E-region heights (90–98 km). Making use of
the full correlation analysis that enables determination of useful
geometrical parameters from the ground diffraction pattern, the present work
delineates for the first time the characteristics of the radar scatterers
during the occurrences of equatorial sporadic E (Esq) and blanketing
sporadic E (Esb) noticed in simultaneous ionospheric sounding records
at Tirunelveli. The ground magnetometer data provide indirect information on
the strength of the EEJ and afternoon reverse EEJ or counterelectrojet
(CEJ). The results presented in this work also reveal the height dependence
of the radar echo intensity and some of the geometrical parameters at
certain times, thus clearly bringing out the complex interplay of various
physical processes in the probing region. |
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