Papers on Ionosphere and Upper Atmosphere
The multi-instrumented studies of equatorial thermosphere aeronomy scintillation system: Climatology of zonal drifts
Article first published online: 20 SEP 2012
Copyright 1996 by the American Geophysical Union.
Journal of Geophysical Research: Space Physics (1978–2012)
Volume 101, Issue A12, pages 26839–26850, 1 December 1996
How to Cite
1996), The multi-instrumented studies of equatorial thermosphere aeronomy scintillation system: Climatology of zonal drifts, J. Geophys. Res., 101(A12), 26839–26850, doi:10.1029/96JA00183., , , , and (
- Issue published online: 20 SEP 2012
- Article first published online: 20 SEP 2012
- Manuscript Accepted: 15 JAN 1996
- Manuscript Received: 1 NOV 1995
A spaced-antenna scintillation system was installed at Ancon, Peru, in May 1994 to measure scintillation of 250-MHz signals from a geostationary satellite by three antennas spaced in the magnetic east-west direction. These measurements were used to establish the climatology of the zonal drift of the irregularities which cause equatorial scintillations. The major objective of this study is to compare this drift climatology to the climatology of zonal neutral wind which is the driver of the equatorial electrodynamics. A comparison of these two climatologies in conjunction with scintillation statistics may provide some clues regarding factors which help or hinder the formation of equatorial spread-F (ESF). With these objectives in mind, the first year's drift and scintillation statistics have been presented as a function of local time, season and magnetic activity and compared with the statistics of ion drift published earlier from incoherent scatter radar observations. The scintillation drift is in good agreement with the Jicamarca radar observations except for the fact that the local time dependence of our drift observations exhibit a broader maximum. The broad maximum may be attributed to lower ion drag experienced in the presence of ESF due to sustained uplifting of the ionosphere. During magnetically active periods, the scintillation drift often exhibits east to west reversals presumably because of the disturbance dynamo effects. The westward drifts during such reversals may be as large as 100 m/s. We have also modeled the zonal drifts as a seasonal basis by using Hedin's neutral wind model and Anderson's fully analytical ionospheric model. The modeled zonal drifts present good quantitative agreement with the drifts obtained with the scintillation technique.