East-west asymmetry in type-2 echoes and enhanced electron drift in the equatorial electrojet

Details East-west asymmetry in type-2 echoes and enhanced electron drift in the equatorial electrojet East-west asymmetry in type-2 echoes and enhanced electron drift in the equatorial electrojet

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29h..21t&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 8, pp. 21-1, CiteID 1180, DOI 10.1029/2001GL014582

Physics

2

Ionosphere: Equatorial Ionosphere, Ionosphere: Plasma Waves And Instabilities, Ionosphere: Ionospheric Irregularities, Ionosphere: Electric Fields (2712), Ionosphere: Ionospheric Dynamics

Scientific paper

Simultaneous measurements of type-2 echoes in the equatorial electrojet (EEJ) and the 150 km echoes were made with a tri-beam radar on Pohnpei (Federated States of Micronesia). Using the mean Doppler velocity () to estimate the line-of-sight component of electron drift velocity ([(V_e)]), we show that its vertical component (Vez) increases with altitude and exceeds Vez measured at 150 km, between 96 and 103 km. At 103 km, the ratio of vertical to Vez at 150 km was five. This enhancement explains the hitherto puzzling east-west asymmetry in of type-2 echoes. More importantly, we show how the enhanced Vez appears to be associated with the discrepancy in the altitude of peak current density of the EEJ, between measurement and model. We discuss roles played by kilometer-scale irregularities and close by describing apparent effects by atmospheric gravity waves.

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