Thumbnail
Access Restriction
Open

Author Hysell, D. L. ♦ Kelley, M. C. ♦ Swartz, W. E.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ SPREAD F ♦ SPECTRAL DENSITY ♦ ELECTRIC FIELDS ♦ FLUCTUATIONS ♦ POWER DENSITY
Abstract Sounding rocket data from the 1990 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{sup {minus}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 quite 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 {vert_bar}{delta}E{vert_bar}{sup 2} {approximately} k{sup 2}{vert_bar}{delta}n/n{vert_bar}{sup 2}) at smaller scales. The perturbed zonal electric field, {delta}E{sub x}, dominates the vertical field, {delta}E{sub z}, at long wavelengths, but the situation is reversed at smaller scales. 25 refs., 7 figs.
ISSN 01480227
Educational Use Research
Learning Resource Type Article
Publisher Date 1994-05-01
Publisher Place United States
Journal Journal of Geophysical Research
Volume Number 99
Issue Number A5


Open content in new tab

   Open content in new tab