The influence of electric fields on radar measurements of winds in the upper mesosphere
Article first published online: 7 DEC 2012
This paper is not subject to U.S. copyright. Published in 1983 by the American Geophysical Union.
Volume 18, Issue 6, pages 1028–1034, November-December 1983
How to Cite
1983), The influence of electric fields on radar measurements of winds in the upper mesosphere, Radio Sci., 18(6), 1028–1034, doi:10.1029/RS018i006p01028.(
- Issue published online: 7 DEC 2012
- Article first published online: 7 DEC 2012
- Manuscript Accepted: 19 APR 1983
- Manuscript Received: 11 OCT 1982
The mesosphere-stratosphere-troposphere radar technique deduces wind speeds and directions from the Doppler velocities of small-scale irregularities in the refractive index. In the upper mesosphere, where the refractive-index irregularities are due to corresponding irregularities in plasma density, the velocities may depart significantly from the wind vectors, especially at auroral-zone latitudes, where electric fields can be large. The magnitude of the effect is estimated for spherical irregularities in the height region from 60 to 120 km. In the case of horizontal drifts, the departure of the plasma velocity from that of the neutral wind is small in comparison to typical horizontal wind velocities at heights below 90 km except under highly disturbed conditions. The average vertical component of the neutral wind, however, is small, and attempts to measure it in the upper mesosphere can be seriously affected by electric fields mapped down from the auroral-zone magnetosphere, and even by the dynamo action of local horizontal winds.