The 630 nm MIG and the vertical neutral wind in the low latitude nighttime thermosphere

Details The 630 nm MIG and the vertical neutral wind in the low latitude nighttime thermosphere The 630 nm MIG and the vertical neutral wind in the low latitude nighttime thermosphere

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21...97h&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 2, p. 97-100

Physics

9

Airglow, Atmospheric Circulation, Atmospheric Density, Atmospheric Physics, Equatorial Atmosphere, F Region, Meteorology, Night, Scale Height, Thermosphere, Vertical Air Currents, Wind (Meteorology), Wind Velocity, Wind Velocity Measurement, Brazil, Estimates, Fabry-Perot Interferometers, Gradients, Graphs (Charts), Latitude, Ratios, Viscosity

Scientific paper

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 approximately equals (Partial derivative Uy/Partial derivative y)H for the vertical wind Uz0 at the reference altitude for the pressure tendency equation; H is the atmospheric density scale height, and (Partial derivative Uy/Partial derivative y) is the meridional wind gradient. The velocity gradient associated with the Meridional Intensity Gradient (MIG) of the O1D) 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.

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