On the coexistence of kilometer- and meter-scale irregularities in the nighttime equatorial F region

Details On the coexistence of kilometer- and meter-scale irregularities in the nighttime equatorial F region On the coexistence of kilometer- and meter-scale irregularities in the nighttime equatorial F region

Sep 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.4219b&link_type=abstract

Journal of Geophysical Research, vol. 83, Sept. 1, 1978, p. 4219-4226. Research supported by the U.S. Defense Nuclear Agency

Physics

23

Equatorial Atmosphere, F Region, Ionospheric Disturbances, Night Sky, Nocturnal Variations, Backscattering, Power Spectra, Radar Scattering, Scintillation, Vertical Distribution

Scientific paper

The relationship between large-scale irregularities (approximately 0.1-1 km) giving rise to scintillations and small-scale irregularities (3 m) causing 50-MHz backscatter were studied by means of nighttime multifrequency scintillation and 50-MHz radar backscatter observations simultaneously performed over a nearly common ionospheric volume at the dip equator in Peru during March 1977. It is shown that the kilometer- and meter-scale irregularities coexist during the generation phase of equatorial irregularities in the evening hours, while in the later phase, approximately an hour after the onset, the meter-scale irregularities decay but the large-scale irregularities continue to retain their high spectral intensities. The existence of L band scintillations without any plume structure on backscatter maps indicates that a cutoff of the spectral intensity probably occurs (later) at some scale length between 100 and 3 m.

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