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| Titel |
The equatorial ionospheric response over Tirunelveli to the 15 January 2010 annular solar eclipse: observations |
| VerfasserIn |
C. K. Nayak, D. Tiwari, K. Emperumal, A. Bhattacharyya |
| 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. 9 ; Nr. 30, no. 9 (2012-09-25), S.1371-1377 |
| Datensatznummer |
250017269
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| Publikation (Nr.) |
 copernicus.org/angeo-30-1371-2012.pdf |
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| Zusammenfassung |
| In this paper we present a case study of the annular solar eclipse effects
on the ionization of E and F regions of equatorial ionosphere over
Tirunelveli [77.8° E, 8.7° N, dip 0.4° N] by means of
digital ionosonde on 15 January 2010. The maximum obscuration of the eclipse
at this station was 84% and it occurred in the afternoon. The E and F1
layers of the ionosphere showed very clear decrease in their electron
concentrations, whereas the F2 layer did not show appreciable changes. A reduction of 30%
was observed in the foF1 during the maximum phase of the eclipse.
During the beginning phase of the eclipse, an enhancement of 0.97 MHz was
observed in the foF2 as compared to that of the control days. But the foF2
decreased gradually as the eclipse progressed and a decrease of 0.59 MHz was
observed towards the end phase of the eclipse. Observed variations in the
h'F2 and hmF2 showed lower values than the control days, although hmF2 was
found to increase a bit during the eclipse. Observed variability in the E,
F1 and F2 layer ionospheric parameters on the eclipse day and their
departure from the control days are discussed as the combined effect of
annular eclipse and presence of counter equatorial electrojet (CEEJ). |
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