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- W1981466320 abstract "Horizontal motions of temperate zone winter daytime Es, ionization have been investigated using ionogram film records obtained from an array of three spaced ionosondes. The array (element separation ∼40 km) situated near Christchurch, New Zealand (43° S, 172° E geographic; 48° S, 107° W geomagnetic), was operated during June and July 1982 using 5 min soundings yielding 16 mm film ionograms. Detailed reduction of all available 5 min ionograms was carried out to measure, after careful calibration, the ionosonde parameters ƒ0Es, ƒbEs, and h′Es. Apparent drift velocities were deduced for individual Es events by considering the cross-correlations between stations of the measured ionosonde frequency parameters ƒ0Es and ƒbEs. The average Es drift velocity, for both parameters, was found to be cquatorward with a speed of ∼90 m s−1. The velocity distributions obtained were composed of two groups: one group with velocities of 140±21 ms−1 towards the equator considered to be due to the presence of travelling ionospheric disturbances propagating through the Es layer; and a lower group with velocities of 40 ± 2 m s−1 also towards the equator, interpreted as due to the motion of each Es layer as a whole. Horizontal motions of each Es layer were also determined from single ionosonde h′Es variations and found to average 57±7 m s−1 which supports the hypothesis of a bulk neutral wind mechanism for the lower velocity group." @default.
- W1981466320 created "2016-06-24" @default.
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- W1981466320 date "1991-07-01" @default.
- W1981466320 modified "2023-09-23" @default.
- W1981466320 title "Horizontal motions of south temperate zone sporadic-E using an ionosonde array" @default.
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- W1981466320 doi "https://doi.org/10.1016/0032-0633(91)90106-k" @default.
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