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  • Author or Editor: R. G. Roper x
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Murry L. Salby
and
R. G. Roper

Abstract

Meteor wind data taken over Atlanta (34°N, 84°W) during the three-year interval 1974–77 are analyzed for periodic fluctuations of a recurrent nature. Power spectra and cross spectra of the zonal and meridional velocities between 80 and 100 km are constructed for several samples.

Ensemble statistics indicate the regular appearance of periods near 17, 8, 5, 2, 1.6 and 1.2 days. Most of these display smaller spectral values near 90 km. The general seasonal behavior has maximum values in winter and minimum values in summer, paralleling the observed variation of traveling wave energy flux in the stratosphere.

The regularity with which these oscillations appear, tempts an association with the periods of atmospheric normal modes.

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Prakash M. Dolas
and
R. G. Roper

Abstract

The wind data generated by an all sky, continuous wave radio meteor wind facility at Atlanta (34°N, 84°W) is analyzed over the period of August 1974 through July 1975. Zonal and meridional components of the prevailing wind over the height range of 80–100 km, at 2 km intervals represent 5–10 day averages where the tidal components have been removed. Large southerly wind during winter and weak northerly wind during summer at 80–100,km altitude is consistent with other observations and mesospheric circulation models.

Various phases of the 1974–75 midwinter stratospheric warming, including a pre-warming pulse during the second half of November 1974, are indicated to affect the prevailing Wind in the meteor zone over Atlanta in a consistent manner, by making use of the latitudinal and vertical compensation of temperature and also the movement of pressure systems in the stratosphere and above.

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