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- W2109601323 abstract "It is shown that large negative divergences (gradients) in the horizontal neutral wind in the equatorial thermosphere can support downward neutral winds in excess of 20 m/s. With attention to the meridional and vertical winds only, the pressure tendency equation is used to derive the expression Uz0 ≈ 〈∂Uy /∂y〉 H for the vertical wind Uz0 at the reference altitude for the pressure tendency equation; H is the atmospheric density scale height, and 〈∂Uy/∂y〉 is the meridional wind gradient. The velocity gradient associated with the Meridional Intensity Gradient (MIG) of the O(¹D) emission (630 nm) at low latitudes is used to estimate the vertical neutral wind in the MIG region. Velocity gradients derived from MIG data are about 0.5 (m/s)/km) or more, indicating that the MIG region may contain downward neutral winds in excess of 20 m/s. Though direct measurements of the vertical wind are scarce, Fabry-Perot interferometer data of the equatorial F-region above Natal, Brazil, showed downward winds of 30 m/s occurring during a strong meridional wind convergence in 1982. In-situ measurements with the WATS instrument on the DE-2 satellite also show large vertical neutral winds in the equatorial region." @default.
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- W2109601323 date "1994-01-15" @default.
- W2109601323 modified "2023-10-10" @default.
- W2109601323 title "The 630 nm MIG and the vertical neutral wind in the low latitude nighttime thermosphere" @default.
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- W2109601323 doi "https://doi.org/10.1029/93gl03115" @default.
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