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Dominance of the diurnal mode of horizontal drift velocities at F-region heightsDrift measurements perpendicular to the magnetic field are examined, taking into account also some nighttime measurements. Nighttime measurements of drift velocities are more difficult because densities are lower. However, the uncertainty in the drift velocities can be optimized by making use of an approach reported by Kirchhoff (1973). The approach involves a careful selection of the elevation angle of the radar antenna. Measured velocities are discussed along with the magnetospheric perturbation effect. The measurements are compared with conclusions of the dynamo theories.
Document ID
19750041482
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kirchhoff, V. W. J. H.
(Pennsylvania State University University Park, Pa.; Instituto de Pesquisas Espaciais, Sao Jose dos Campos, Sao Paulo, Brazil)
Carpenter, L. A.
(Pennsylvania State University University Park, Pa., United States)
Date Acquired
August 8, 2013
Publication Date
March 1, 1975
Publication Information
Publication: Journal of Atmospheric and Terrestrial Physics
Volume: 37
Subject Category
Geophysics
Accession Number
75A25554
Funding Number(s)
CONTRACT_GRANT: N00014-67-A-0385-0017
CONTRACT_GRANT: NGL-39-009-003
Distribution Limits
Public
Copyright
Other

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