AbstractPost-sunset and pre-sunrise vertical plasma drifts at the equatorial F-region have been investigated using the HF Doppler radar and ionosonde observations. Observed vertical plasma drift features during the sunrise are found to complement that observed during the evening. The post-sunset vertical plasma drift is characterized by an upward enhancement, a pre-reversal enhancement and a reversal in the drift direction. Similarly, the pre-sunrise plasma drift is characterized by a sudden downward excursion followed by an upward turning. The wavelet analysis of the plasma drift shows the presence of fluctuations in the period range 4–32min and the short period fluctuations are attributed to the atmospheric gravity waves.
Characteristics of the equatorial F-region vertical plasma drift observed during post-sunset and pre-sunrise hours
Advances in Space Research ; 46 , 5 ; 618-625
2010-04-21
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Vertical shear at the equatorial F-region ionosphere during post-sunset hours
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