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Zonal Neutral Winds at Equatorial and Low Latitudes by C. Martinis; J. Meriwether; R. Niciejewski; M. Biondi; C. Fesen; M. Mendillo is a Physics and Astronomy article available to read on EtoBox.

What is Zonal Neutral Winds at Equatorial and Low Latitudes about?

Fabry-Perot interferometric (FPI) measurements of thermospheric zonal neutral winds at Arequipa, Peru (16:7 • S; 71:5 • W; -2:7 • dip), and Carmen Alto, Chile (23:1 • S; 69:4 • W; -10:2 • dip), were collected during the solar minimum periods of September-October 1996 and 1997. The data set included 39 nights from Arequipa and 14 nights for Carmen Alto, with 8 nights of simultaneous observations. Analysis of averaged results found the peak evening zonal neutral wind speed of ∼127 ± 15 m=s eastward for the Arequipa observatory, which is located near the magnetic equator, to occur between 21:30 and 22:30 LT. In contrast, the peak evening zonal winds of ∼100 ± 10 m=s eastward observed from Carmen Alto, which is located near the crest of the equatorial ionization anomaly (EIA), occurred ∼ 0:5-1 h later. These measurements represent the ÿrst case of groundbased FPI observations of the so called equatorial temperature and wind anomaly (ETWA) over such a small latitude range in the same longitude sector. This reduction in speed of ∼ 20-25% at Carmen Alto relative to Arequipa is attributed to increased ion drag at Carmen Alto caused by the higher electron density within the EIA region at al

Who reads Zonal Neutral Winds at Equatorial and Low Latitudes?

Author

C. Martinis; J. Meriwether; R. Niciejewski; M. Biondi; C. Fesen; M. Mendillo

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 1364-6826)

Published

2001

Language

EN

Field

Physics and Astronomy (Physical Sciences)