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| Titel |
Morphological study of the field-aligned E-layer irregularities observed by the Gadanki VHF radar |
| VerfasserIn |
C. J. Pan, P. B. Rao |
| 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 ; 22, no. 11 ; Nr. 22, no. 11 (2004-11-29), S.3799-3804 |
| Datensatznummer |
250015050
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| Publikation (Nr.) |
 copernicus.org/angeo-22-3799-2004.pdf |
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| Zusammenfassung |
| We report on the field-aligned irregularities observed in the low-latitude
sporadic E-layer (Es) with the Gadanki (13.5° N, 79.2° E;
geomagnetic latitude 6.3° N) VHF radar. The radar was operated
intermittently for 15 days during the summer months in 1998 and 1999, for
both daytime and nighttime observation. The total observation periods are
161h for the nighttime and 68h for the daytime. The observations
were used to study the percentage of occurrence of the E-region echoes for
both daytime and nighttime. The statistical characteristics of the mean
radial velocity and spectral width are presented for three cases based on
the echo occurrence characteristics and the altitude of observations (from
90 to 140km ranges), namely, the lower E-region daytime (90-110km), the
lower E-region nighttime (90-105km) and the upper E-region nighttime
(105-140km) echoes. The results are compared with that of Piura, a
low-latitude station located at about the same geomagnetic latitude, but to the
south of the equator. By comparing the behaviors of the lower E-region radar
echoes of the summer months between Gadanki and Piura, we find that the
lower altitude echoes below about 100km are rarely reported in Piura but
commonly seen in Gadanki. Features of the nighttime echoes observed by these
two radars are quite similar but daytime FAI echoes are again seldom
detected by Piura. |
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