Simultaneous rocket-borne beacon and in situ measurements of equatorial spread F - Intermediate wavelength results

Details Simultaneous rocket-borne beacon and in situ measurements of equatorial spread F - Intermediate wavelength results Simultaneous rocket-borne beacon and in situ measurements of equatorial spread F - Intermediate wavelength results

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.2411r&link_type=abstract

Journal of Geophysical Research, vol. 86, Apr. 1, 1981, p. 2411-2420.

Computer Science

Performance

48

Equatorial Regions, Radio Beacons, Rocket-Borne Instruments, Spread F, Backscattering, Electron Density (Concentration), Electrostatic Probes, F Region, Scintillation, Space Plasmas, Spectrum Analysis

Scientific paper

A high-performance rocket carrying a four-frequency, phase-coherent beacon and full complement of in situ diagnostic instrumentation was launched into active equatorial spread F on July 17, 1979. In this paper, the results of a spectral analysis of the beacon phase-scintillation and Langmuir probe data are reported. By the use of simultaneous backscatter data from the Altair radar it was possible to establish that the scintillation develops in high-density regions adjacent to the prominent plume structures and associated depletions. In these high-density regions the in situ spectra show a pronounced change in the power law slope near a spatial wavelength of 500 m. Larger scale structures admit a systematically varying power law index that is generally less than 2, in good agreement with a large body of Wideband satellite data and recently analyzed Atmospheric Explorer E data. Smaller-scale structures admit a spectral index much larger than 2. A single, overall power law near the -2 power of the wavenumber was found only in low-density regions that did not contribute significantly to the scintillation. The results suggest that refinements in the current theories of equatorial spread F near and above the F region peak are needed.

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