1974
DOI: 10.1071/ph740401
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A Determination of the Daytime Thermospheric Wind Profile by Observing a Lithium Trail with a Field-of-view Scanner

Abstract: A description is given of the design of an instrument which has been built to detect the lithium 671 nm line against the daytime sky continuum. The instrument covers the field of view by means of a servocontrolled scanning mirror and detects the lithium line by chopping the received beam and using phase sensitive detection. Data obtained for a daytime release of lithium between 90 and 130 Ian altitude are presented, and the methods for the analysis of these data to obtain a wind profile of the upper atmosphere… Show more

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Cited by 6 publications
(6 citation statements)
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“…The estimated vertical wavelength of the measured winds is roughly 20–30 km, indicative of either diurnal or semidiurnal tides (e.g., J. Forbes, 1995) although such variations may also be due to gravity waves. We note that a similar spiral structure was observed in wind measurements by Hind and Lloyd (1974). Those researchers reported a counter‐clockwise rotation that they attributed to the fact their observations were gathered in the southern hemisphere.…”
Section: Discussionsupporting
confidence: 87%
See 1 more Smart Citation
“…The estimated vertical wavelength of the measured winds is roughly 20–30 km, indicative of either diurnal or semidiurnal tides (e.g., J. Forbes, 1995) although such variations may also be due to gravity waves. We note that a similar spiral structure was observed in wind measurements by Hind and Lloyd (1974). Those researchers reported a counter‐clockwise rotation that they attributed to the fact their observations were gathered in the southern hemisphere.…”
Section: Discussionsupporting
confidence: 87%
“…Daytime wind measurements using vapor trails, as reported herein, are very scarce, with only two experiments reporting daytime wind observations at midlatitudes in the lower ionosphere, including Hind and Lloyd (1974) from Australia and Rees et al (1979) from Wallops. Both sets of observations showed moderate-to large-amplitude winds with spiral structure although no association with the dynamo current systems was reported.…”
Section: Research Lettermentioning
confidence: 84%
“…Lithium and sodium have still been used for special applications, however. Lithium, for example, which produces an exceptionally bright resonant emission was used in several studies to measure the daytime neutral winds in the ionosphere [ Rees et al , 1972a; Bedinger , 1973a; Hind and Lloyd , 1974].…”
Section: Data Set Descriptionmentioning
confidence: 99%
“…The lithium trail technique saw a renewed interest in the 1970's as a technique for measuring daytime E-region winds (e.g., Bedinger, 1973;Hind and Lloyd, 1974). The lithium line is sufficiently bright so that the trails could be detected in daylight conditions with the improved narrow- band filters.…”
Section: Introductionmentioning
confidence: 99%