Steepened structures in equatorial spread F. 1: New observations

Details Steepened structures in equatorial spread F. 1: New observations Steepened structures in equatorial spread F. 1: New observations

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....99.8827h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol 99, no. A5, p. 8827-8840

Computer Science

Sound

20

Atmospheric Sounding, Electric Field Strength, Electron Density Profiles, Energy Spectra, F Region, Plasma Density, Plasma Spectra, Power Spectra, Rocket Sounding, Crres (Satellite), Data Reduction, In Situ Measurement, Plasma Probes, Sounding Rockets

Scientific paper

Sounding rocket data from the 1990 Combined Release and Radiation Effects Satellite (CRRES)/EQUIS equatorial spread F campaign on Kwajalein Atoll are presented. Two Terrier Malamute sounding rockets were launched into active spread F conditions on July 30 and August 2, respectively, and achieved apogee slightly below 500 km, just above the F peak. Plasma frequency probes aboard both rockets showed that the unstable nighttime F region is characterized by propagating steepened structures. Power density spectra for the structures typically exhibit two regions that obey k(exp -n) scaling, where n is approximately equal to 2 at wavelengths greater than 80-100 m and approximately equal to 5 at shorter wavelengths. These spectral indices are quiet variable, and the long-wavelength spectral index in particular seems to decrease with increasing amplitude of density fluctuations. The rocket payloads also measured vector electric fields in the plane perpendicular to B over wavelengths ranging from over 60 km to less than 6 m. Both vector components of the perpendicular electric field are proportional to delta n/n at wavelengths longer than 300 m but assume a Boltzmann relationship (with square of the absolute value of delta E approximately equal to (k(exp2))(square of the absolute value of (delta n/n)) at smaller scales. The perturbed zonal electric field, delta E(sub x), dominates the vertical field, delta E(sub z), at long wavelenghts, but the situation is reversed at smaller scales.

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