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• W1988077999 abstract "In order to clarify the origin of the so‐called quasi periodic echoes (QPE) that have been often detected by radar observations in the presence of sporadic‐ E ( E s ) layers in the nighttime midlatitude ionosphere, two sounding rockets were launched during the SEEK (Sporadic‐ E Experiment over Kyushu) campaign. Each rocket carried a swept‐frequency impedance probe to measure the E ‐region electron‐density (N e ) profile. Using the four N e profiles obtained during the two rocket flights together with a neutral‐wind profile obtained from a trimethyl aluminum (TMA) chemical release experiment on one of the rockets and QPE obtained with a ground‐based radar, we consider the role of wind shear in the formation of the observed E s layers, and the question of whether QPE are associated with E s layers that are modulated in altitude. The N e profiles of E s structures that were obtained in the presence of QPE were characterized by the highly concentrated thin layers. The formation of such a thin layer by a neutral‐wind shear process was confirmed in comparison with the TMA measurements. The peak N e values of the E s layers ranged from 2.2 to 9.3 × 10 4 el/cm³ near 100‐km altitude. These primary E s layers were accompanied by significant secondary structures that were located about 12 to 20 km above the main E s layers and had peak N e that ranged from 5.2 × 10³ to 1.3×10 4 el/cm³. The average altitude profiles of QPE approximately covered the range where the E s ‐layer peaks appeared. Our principal finding is that the observed E s structures tended to resemble horizontally stratified layers rather than structures with deep altitude modulation like previous QPE model, although the rocket measurements were separated from those by radar by 90 to 145 km." @default.
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• W1988077999 date "1998-06-01" @default.
• W1988077999 modified "2023-09-25" @default.
• W1988077999 title "Structures in sporadic-<i>E</i>observed with an impedance probe during the SEEK Campaign: Comparisons with neutral-wind and radar-echo observations" @default.
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• W1988077999 doi "https://doi.org/10.1029/98gl00709" @default.
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