Condor equatorial spread F-italic Campaign: Overview and results of the large-scale measurements
During the Condor campaign a number of instruments were set up in Peru to support the rocket experiments. In this series of papers we report on the results of the experiments designed to study the equatorial F-italic region. In this overview paper we summarize the main results as well as report upon the macroscopic developments of spread F-italic as evidenced by data from backscatter radars, from scintillation observations, and from digital ionosonde measurements. In this latter regard, we argue here that at least two factors other than the classical gravitational Rayleigh-Taylor plasma instability process must operate to yield the longest-scale horizontal organization of spread F-italic structures. The horizontal scale typical of plume separation distances can be explained by invoking the effect of a shear in the plasma flow, although detailed comparison with theory seems to require shear frequencies a bit higher than observations indicate. On the other hand, the largest-scale organization or modulation of the scattering layer cannot be explained by the shear theory and must be due to local time variations in the ionospheric drift or to gravity wave induced vertical motions. Using simultaneous rocket and radar data, we were also able to confirm the oft quoted hypothesis that rapid overhead height variations in the scattering region over Jicamarca are primarily spatial structures advecting overhead. The detailed rocket-radar comparison verified several other earlier results and speculations, particularly those made in the PLUMEX experiments.
- Research Organization:
- School of Electrical Engineering, Cornell University, Ithaca, New York
- OSTI ID:
- 5522794
- Journal Information:
- J. Geophys. Res.; (United States), Vol. 91:A5
- Country of Publication:
- United States
- Language:
- English
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Digital ionosonde observations during equatorial spread F-italic
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Related Subjects
GENERAL PHYSICS
SPREAD F
PLASMA DENSITY
ELECTRIC FIELDS
GEOMAGNETIC EQUATOR
IONOSPHERIC STORMS
RADAR
SCINTILLATION COUNTING
SHEAR
COUNTING TECHNIQUES
EARTH ATMOSPHERE
F REGION
IONOSPHERE
MEASURING INSTRUMENTS
PLANETARY IONOSPHERES
RANGE FINDERS
640201* - Atmospheric Physics- Auroral
Ionospheric
& Magetospheric Phenomena