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| Titel |
Sequential sporadic-E layers at low latitudes in the Indian sector |
| VerfasserIn |
P. T. Jayachandran, P. Sri Ram, P. V. S. Rama Rao, V. V. Somayajulu |
| 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 ; 17, no. 4 ; Nr. 17, no. 4, S.519-525 |
| Datensatznummer |
250013713
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| Publikation (Nr.) |
 copernicus.org/angeo-17-519-1999.pdf |
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| Zusammenfassung |
A study of the formation and movement of
sequential Sporadic-E layers observed during the night-time hours at two Indian
low-latitude stations, SHAR (dip 10°N) and Waltair (dip 20°N) shows that the
layer are formed around 19:00 h. IST at altitudes of ~180 km. They descend to
the normal E-region altitude of about 100 km in three to four hours and becomes
blanketing type of Es before they disappear. However, the absence of these
descending layers at an equatorial station, Trivandrum (dip 2°N) gives the
experimental evidence for wind shear theory. The meridional neutral wind derived
from the height variation of the F-layer showed significant poleward wind during
the descent of these layers. Hence it is inferred that these layers are formed
as a consequence of the convergence of plasma by the poleward wind and the
equatorward propagating gravity waves (inferred from the height fluctuations of
F-layer).
Key words. Ionosphere (active experiments; equatorial
ionosphere · ionospheric irregularities) |
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