On the nature of the electrojet irregularities responsible for daytime VHF scintillations

Details On the nature of the electrojet irregularities responsible for daytime VHF scintillations On the nature of the electrojet irregularities responsible for daytime VHF scintillations

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.5262b&link_type=abstract

Journal of Geophysical Research, vol. 82, Nov. 1, 1977, p. 5262-5266.

Physics

3

Atmospheric Turbulence, Daytime, Equatorial Electrojet, Scintillation, Very High Frequencies, Ionograms, Radar Echoes, Radar Scattering, Sporadic E Layer, Wavelengths

Scientific paper

The nature of electrojet irregularities responsible for daytime VHF scintillations at 41 and 140 MHz observed at Huancayo, Peru, has been examined by conducting a study of simultaneous scintillation measurements, ionograms, and 50-MHz oblique radar backscatter. It is found that the times of onset and decay of VHF scintillations correspond closely with the times of onset and decay of type 2 irregularities identified by the radar as well as E-sq echoes on ionograms, indicating thereby that type 2 irregularities cover the scale size range of at least 1 km to a few meters. By assuming a three-dimensional irregularity power spectrum of spectral index 4 and an outer scale dimension of 2 km the range of daytime scintillations at 41 MHz is shown to be consistent with irregularity amplitudes of approximately 5-15% for an ambient ionization density of 10 to the 11th/cu m.

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