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Measurement of the Vertical Gradient of the Semidiurnal Tidal Wind Phase in Winter at the 95 Km LevelWhen supplemented by absolute reflection height measurements, low frequency wind measurements in the 90-100 km height range become truly competitive in comparison with the more widely used radar meteor wind observations. For example, height profiles of the wind parameters in the so-called meteor zone can be obtained due to the considerable interdiurnal variability of the average nighttime reflection heights controlled by geomagnetic activity. The phase of the semidiurnal tidal wind is particularly height-dependent. The measured vertical gradient of 1/4 h/km in winter corresponds to a vertical wavelength of about 50 km. Wind measurements in the upper atmosphere, at heights between 90 and 100 km, were carried out at the Collm Geophysical Observatory of Karl Marx University Leipzig for a number of years. These measurements use the closely-spaced receiver method and three measuring paths, on 179, 227, and 272 kHz. They take place every day between sunset and sunrise, i.e., nightly. A night in this sense may last as long as 18 hours in winter. Both the measurements and their evaluation are completely automatic, and the prevailing winds and tides are separated.
Document ID
19850012168
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Schminder, R.
(Leipzig Univ. (German D.R.).)
Kurschner, D.
(Leipzig Univ. (German D.R.).)
Date Acquired
August 12, 2013
Publication Date
May 1, 1984
Publication Information
Publication: International Council of Scientific Unions Middle Atmosphere Program. Handbook for MAP, Vol. 10
Subject Category
Geophysics
Accession Number
85N20478
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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