The Condor equatorial spread F campaign - Overview and results of large-scale measurements

Details The Condor equatorial spread F campaign - Overview and results of large-scale measurements The Condor equatorial spread F campaign - Overview and results of large-scale measurements

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.5487k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, May 1, 1986, p. 5487-5503.

Computer Science

Sound

58

Equatorial Atmosphere, Ionospheric Sounding, Plasma Diagnostics, Spread F, Backscattering, Ionosondes, Radar Scattering, Scintillation, Space Plasmas, Vertical Distribution

Scientific paper

The main results of experiments conducted to study the equatorial F region from Peru, in support of rocket experiments under Project Condor, are summarized. A report is given on the macroscopic developments of spread F as evidenced by data from backscatter radars, from scintillation observations, and from digital ionosonde measurements. It is argued 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 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, it was possible to confirm the oft-quoted hypothesis that rapid overhead height variations in the scattering region over Jicamarca are primarily spatial structures advecting overhead. Several other earlier results and speculations have been verified.

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