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|Title:||VHF Radar Observations during Equatorial Counter Electrojet Events|
|Authors:||Somayajulu, V V|
Viswanathan, K S
|Abstract:||The VHF backscatter radar observations at Thumba (dip, 56'S; geogr.long., 76°57E) provide a direct observational evidence of electrojet current reversals during the morning as well as the evening counter electrojet events. Out of the many events observed, two are presented in detail to bring out the fact that even weak counter electrojet events can be observed with the backscatter radar if a negative gradient of electron density is present at the time of counter electrojet events due to presence of blanketing Es layers. Such layers do occurfrequentIy during summer months. Moreover, simultaneous ionogram recordings at Thumba show that rapid changes in the E-region electron density gradients and formation of blanketing Es layers coincide sometimes with the occurrence of the counter electrojet events. The backscatter radar and ionogram observations together demonstrate that strong local wind shears are present during the counter electrojet events. From this, one may conclude, at least tentatively, that abnormalities in the E-region wind structures are responsible for counter electrojet events.|
|ISSN:||0975-105X (Online); 0367-8393 (Print)|
|Appears in Collections:||IJRSP Vol.16(6) [December 1987]|
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